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关键词

DX桩 15

承载力 7

沉降 7

农业面源污染 2

冲刷防护 2

大气污染 2

数值分析 2

1)幂模型 1

2R-1C模型；嵌入式系统；参数估计；非迭代方法；二次型 1

3D细胞容器 1

Beclin-1 1

CRD法 1

DX群桩 1

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Finite element prediction on the response of non-uniformly arranged pile groups considering progressivefailure of pile-soil system

Qian-Qing ZHANG, Shan-Wei LIU, Ruo-Feng FENG, Jian-Gu QIAN, Chun-Yu CUI

《结构与土木工程前沿（英文）》 2020年 第14卷 第4期   页码 961-982 doi: 10.1007/s11709-020-0632-5

摘要： A uniform arrangement of individual piles is commonly adopted in the conventional pile group foundation, and basin-shaped settlement is often observed in practice. Large differential settlement of pile groups will decrease the use-safety requirements of building, even cause the whole-building tilt or collapse. To reduce differential settlement among individual piles, non-uniformly arranged pile groups can be adopted. This paper presents a finite element analysis on the response of pile groups with different layouts of individual piles in pile groups. Using the user-defined subroutine FRIC as the secondary development platform, a softening model of skin friction and a hyperbolic model of end resistance are introduced into the contact pair calculation of ABAQUS software. As to the response analysis of a single pile, the reliability of the proposed secondary development method of ABAQUS software is verified using an iterative computer program. The reinforcing effects of individual piles is then analyzed using the present finite element analysis. Furthermore, the response of non-uniformly arranged pile groups, e.g., individual piles with variable length and individual piles with variable diameter, is analyzed using the proposed numerical analysis method. Some suggestions on the layout of individual piles are proposed to reduce differential settlement and make full use of the bearing capacity of individual piles in pile groups for practical purposes.

关键词： numerical simulation     non-uniformly arranged pile groups     differential settlement     pile-soil interaction    

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Influence of axial load on the lateral pile groups response in cohesionless and cohesive soil

Jasim M. ABBASA,Zamri CHIK,Mohd Raihan TAHA

《结构与土木工程前沿（英文）》 2015年 第9卷 第2期   页码 176-193 doi: 10.1007/s11709-015-0289-7

摘要： The lateral response of single and group of piles under simultaneous vertical and lateral loads has been analyzed using a 3D finite element approach. The response in this assessment considered lateral pile displacement and lateral soil resistance and corresponding - curve. As a result, modified - curves for lateral single pile response were improved with respect to the influence of increasing axial load intensities. The improved plots can be used for lateral loaded pile design and to produce the group action design -multiplier curves and equations. The effect of load combination on the lateral pile group response was performed on three pile group configurations (i.e., 2×1, 2×2 and 3×2) with four pile spacings (i.e., = 2 , 4 , 6 and 8 ). As a result, design curves were developed and applied on the actual case studies and similar expected cases for assessment of pile group behavior using improved p-multiplier. A design equation was derived from predicted design curves to be used in the evaluation of the lateral pile group action taking into account the effect of axial load intensities. It was found that the group interaction effect led to reduced lateral resistance for the pile in the group relative to that for the single pile in case of pure lateral load. While, in case of simultaneous combined loads, large axial load intensities (i.e., more than 6 , where is lateral load values) will have an increase in -multiplier by approximately 100% and will consequently contribute to greater group piles capacities.

关键词： piles     pile group     spacing     configuration     combined load    

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Modeling oblique load carrying capacity of batter pile groups using neural network, random forest regression

Tanvi SINGH, Mahesh PAL, V. K. ARORA

《结构与土木工程前沿（英文）》 2019年 第13卷 第3期   页码 674-685 doi: 10.1007/s11709-018-0505-3

摘要： M5 model tree, random forest regression (RF) and neural network (NN) based modelling approaches were used to predict oblique load carrying capacity of batter pile groups using 247 laboratory experiments with smooth and rough pile groups. Pile length ( ), angle of oblique load ( ), sand density ( ), number of batter piles ( ), and number of vertical piles ( ) as input and oblique load ( ) as output was used. Results suggest improved performance by RF regression for both pile groups. M5 model tree provides simple linear relation which can be used for the prediction of oblique load for field data also. Model developed using RF regression approach with smooth pile group data was found to be in good agreement for rough piles data. NN based approach was found performing equally well with both smooth and rough piles. Sensitivity analysis using all three modelling approaches suggest angle of oblique load ( ) and number of batter pile ( ) affect the oblique load capacity for both smooth and rough pile groups.

关键词： batter piles     oblique load test     neural network     M5 model tree     random forest regression     ANOVA    

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DX旋挖挤扩灌注桩群桩数值分析研究

万飞,张德华

《中国工程科学》 2012年 第14卷 第1期   页码 46-50

摘要：

通过数值计算软件FLAC3D对DX旋挖挤扩灌注桩（简称DX桩）群桩的承载性状和桩周土体的沉降规律进行了研究。分析了桩间距、承力盘布置对群桩极限承载力和沉降控制能力的影响，并比较了6根基桩的DX群桩和8根基桩的直桩群桩的极限承载力。研究结果表明：DX群桩的基桩具有DX单桩的受力性状。承力盘下方土体位移大于承力盘上方土体位移，盘腔上部出现临空面。3D(D为盘径)桩间距的承载力和沉降控制能力最佳。同一地层内，承力盘布置方式（平行、错开布置）对DX群桩的承载力影响甚微。6根基桩的DX群桩的极限承载力是8根基桩的直

关键词： 桩基础     极限承载力     数值计算     DX群桩    

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Effects of functional groups for CO

Chenkai Gu, Yang Liu, Weizhou Wang, Jing Liu, Jianbo Hu

《化学科学与工程前沿（英文）》 2021年 第15卷 第2期   页码 437-449 doi: 10.1007/s11705-020-1961-6

摘要： Metal organic frameworks (MOFs) are promising adsorbents for CO capture. Functional groups on organic linkers of MOFs play important roles in improving the CO capture ability by enhancing the CO sorption affinity. In this work, the functionalization effects on CO adsorption were systematically investigated by rationally incorporating various functional groups including –SO H, –COOH, –NH , –OH, –CN, –CH and –F into a MOF-177 template using computational methods. Asymmetries of electron density on the functionalized linkers were intensified, introducing significant enhancements of the CO adsorption ability of the modified MOF-177. In addition, three kinds of molecular interactions between CO and functional groups were analyzed and summarized in this work. Especially, our results reveal that –SO H is the best-performing functional group for CO capture in MOFs, better than the widely used –NH or –F groups. The current study provides a novel route for future MOF modification toward CO capture.

关键词： metal-organic frameworks     functional groups     CO2 capture     GCMC     DFT    

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Characterization and comparison of organic functional groups effects on electrolyte performance for vanadium

《化学科学与工程前沿（英文）》 2023年 第17卷 第9期   页码 1221-1230 doi: 10.1007/s11705-023-2298-8

摘要： The vanadium redox flow battery with a safe and capacity-controllable large-scale energy storage system offers a new method for the sustainability. In this case, acetic acid, methane sulfonic acid, sulfonic acid, amino methane sulfonic acid, and taurine are used to overcome the low electrolyte energy density and stability limitations, as well as to investigate the effects of various organic functional groups on the vanadium redox flow battery. When compared to the pristine electrolyte (0.22 Ah, 5.0 Wh·L–1, 85.0%), the results show that taurine has the advantage of maintaining vanadium ion concentrations, discharge capacity (1.43 Ah), energy density (33.9 Wh·L–1), and energy efficiency (90.5%) even after several cycles. The acetic acid electrolyte is more conducive to the low-temperature stability of the V(II) electrolyte (177 h at −25 °C) than pristine (82 h at −2 °C). The –SO3H group, specifically the coaction of the –NH2 and –SO3H groups, improves electrolyte stability. The –NH2 and –COOH additive groups improved conductivity and electrochemical activity.

关键词： vanadium redox flow battery     functional groups     organic additives     energy density     stability    

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Unravelling the bottleneck of phosphonic acid anchoring groups aiming toward enhancing the stability

《化学科学与工程前沿（英文）》 2022年 第16卷 第7期   页码 1060-1078 doi: 10.1007/s11705-021-2117-z

摘要： Novel near-infrared sensitizers with different anchoring groups aiming toward improved stability and efficiency of dye-sensitized solar cells were synthesized. Adsorption of these dyes on the mesoporous TiO2 surface revealed the dye adsorption rate of –CH=CH–COOH (SQ-139)>–CH=C(CN)COOH (SQ-140)>–PO3H2 (SQ-143)>–CH=C(CN)PO3H2 (SQ-148)>–CH=C(CN)PO3H–C2H5 (SQ-157)>–PO3H–C2H5 (SQ-151)>–CH=CH–COOH(–PO3H2) (SQ-162). The binding strength of these dyes on mesoporous TiO2 as investigated by dye desorption studies follows SQ-162>SQ-143>SQ-148>SQ-139>SQ-157~SQ-151>SQ-140 order. The acrylic acid anchoring group was demonstrated to be an optimum functional group owing to its fast dye adsorption rate and better binding strength on TiO2 along with good photoconversion efficiency. Results of dye binding on TiO2 surface demonstrated that SQ-162 bearing double anchoring groups of phosphonic and acrylic acid exhibited>550 times stronger binding as compared to dye SQ-140 having cyanoacrylic acid anchoring group. SQ-140 exhibited the best photovoltaic performance with photon harvesting mainly in the far-red to near-infrared wavelength region having short circuit current density, open-circuit voltage and fill factor of 14.28 mA·cm–2, 0.64 V and 0.65, respectively, giving the power conversion efficiency of 5.95%. Thus, dye SQ-162 not only solved the problem of very poor efficiency of dye bearing only phosphonic acid while maintaining the extremely high binding strength opening the path for the design and development of novel near-infrared dyes with improved efficiency and stability by further increasing the π-conjugation.

关键词： anchoring groups     adsorption behaviour     dye-binding strength     squaraine dyes     dye-sensitized solar cells    

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Development of dimensionless P-I diagram for curved SCS sandwich shell subjected to uniformly distributed

Yonghui WANG, Ximei ZHAI

《结构与土木工程前沿（英文）》 2019年 第13卷 第6期   页码 1432-1445 doi: 10.1007/s11709-019-0566-y

摘要： The curved steel-concrete-steel (SCS) sandwich shell was recently proposed to resist blast loading and it showed better blast resistant performance as compared to flat SCS sandwich shell via developing compressive force along the shell. In this paper, a dimensionless Pressure-Impulse (P-I) diagram was constructed as a convenient tool to predict the damage level of curved SCS sandwich shell subjected to uniformly distributed blast loading. The curved SCS sandwich shell was equivalent to a single-degree-of-freedom (SDOF) system and the equation of motion was established by employing the Lagrange’s equation. To construct the dimensionless P-I diagram, the energy balance method was utilized to yield the pressure and impulse asymptotes and the responses in the dynamic response regime were obtained via employing the SDOF method. Then, the finite element method was employed to validate the developed dimensionless P-I diagram. Finally, the procedures of using the constructed dimensionless P-I diagram to quickly conduct the blast resistant design of curved SCS sandwich shell were presented.

关键词： blast loading     curved steel-concrete-steel sandwich shell     Pressure-Impulse diagram     single-degree-of-freedom method     finite element analysis    

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Insight into the effect of surface carboxyl and amino groups on the adsorption of titanium dioxide for

Wenlong Zhang, Xuyang Zhao, Lin Zhang, Jinwei Zhu, Shanshan Li, Ping Hu, Jiangtao Feng, Wei Yan

《化学科学与工程前沿（英文）》 2021年 第15卷 第5期   页码 1147-1157 doi: 10.1007/s11705-020-1978-x

摘要： In this study, TiO functionalized with organic groups were prepared to study the effect of carboxyl and amino groups on the adsorption behavior of TiO for the removal of acid red G (ARG) as an anionic dye from aqueous solution. TiO was successfully modified with carboxyl and amino groups by using the hydrolysis method with oxalic acid (OAD, with two carboxyl groups), ethylenediamine (EDA, with two amino groups) and DL-alanine (DLA, with one carboxyl group and one amino group) at low temperature (65 °C) and labeled as OAD-TiO , EDA-TiO and DLA-TiO , respectively. The ARG uptake by the functionalized TiO samples was largely dependent on the functional groups. The interaction between ARG and the functional organic groups on the TiO samples plays an important role in the adsorption process, which leads to the excellent adsorption performance (higher capacity and faster adsorption rate) of the functionalized TiO samples than that of P25 (commercial TiO without modification). Furthermore, there is no obvious loss of the adsorption capacity for the functionalized TiO even after 5 adsorption-desorption cycles, which indicated the good reusability of the modified TiO samples for anionic dye removal from aqueous solution.

关键词： amino group     carboxylic group     titanium dioxide     ARG     adsorption    

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DX桩群桩承载性状的数值分析

张清林,陈立宏

《中国工程科学》 2012年 第14卷 第1期   页码 51-59

摘要：

通过数值计算对不同桩间距的DX桩群桩进行了分析研究。结果表明：DX桩的群桩效应随着桩间距的减小而逐渐明显，间距为6倍桩径的群桩极限承载力是间距为3倍桩径的群桩极限承载力的1.32倍；群桩间距由3倍桩径增大为6倍桩径时，群桩效应系数由0.59增大为0.78；群桩间土体沉降的最大值发生在两扩盘中间位置处，且随着桩间距的增大而减小。

关键词： DX桩     群桩     沉降     数值分析    

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Optimum lateral extent of soil domain for dynamic SSI analysis of RC framed buildings on pile foundations

Nishant SHARMA, Kaustubh DASGUPTA, Arindam DEY

《结构与土木工程前沿（英文）》 2020年 第14卷 第1期   页码 62-81 doi: 10.1007/s11709-019-0570-2

摘要： This article describes a novel approach for deciding optimal horizontal extent of soil domain to be used for finite element based numerical dynamic soil structure interaction (SSI) studies. SSI model for a 12 storied building frame, supported on pile foundation-soil system, is developed in the finite element based software framework, OpenSEES. Three different structure-foundation configurations are analyzed under different ground motion characteristics. Lateral extent of soil domain, along with the soil properties, were varied exhaustively for a particular structural configuration. Based on the reduction in the variation of acceleration response at different locations in the SSI system (quantified by normalized root mean square error, ), the optimum lateral extent of the soil domain is prescribed for various structural widths, soil types and peak ground acceleration levels of ground motion. Compared to the past studies, error estimation analysis shows that the relationships prescribed in the present study are credible and more inclusive of the various factors that influence SSI. These relationships can be readily applied for deciding upon the lateral extent of the soil domain for conducting precise SSI analysis with reduced computational time.

关键词： soil structure interaction     optimum lateral extent of soil domain length     multi-storyed framed building     pile foundation     OpenSEES     L-K boundaries     dynamic analysis    

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DX桩单桩沉降分析

唐松涛,袁希雨,陈立宏

《中国工程科学》 2012年 第14卷 第1期   页码 41-45

摘要：

DX桩作为变截面桩型的典型代表，具有与普通直孔灌注桩不同的荷载传递机理，使桩基的承载力大大提高，沉降变形显著减小。多点支承的特点使得DX桩的沉降机理变得十分复杂，计算分析困难。通过对DX单桩沉降的实例分析，对DX桩与直孔桩的沉降特性进行对比，验证了设计规程中DX桩的沉降计算公式和修正系数的可靠性。

关键词： DX桩     直孔桩     沉降     修正系数    

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Application of fuzzy analytic hierarchy process model on determination of optimized pile-type

Lei MA, Shuilong SHEN, Jinhui ZHANG, Yang HUANG, Feng SHI

《结构与土木工程前沿（英文）》 2010年 第4卷 第2期   页码 252-257 doi: 10.1007/s11709-010-0017-2

摘要： Pile-type selection is a very important stage of foundation design, and there are many field factors influencing the decision of pile-type selection. Since there is a limitation of traditional “major factors method” to satisfy the requirement of modern foundation construction, this study presents an efficient approach, in which analytic hierarchy process (AHP) is employed. AHP is a multiple criteria decision-making tool that has been applied in many fields related to the decision-making, e.g., in the field of economics, marketing, sociology, etc. However, it is rarely reported that AHP is applied in the field of civil engineering for decision making. In this study, AHP combined with fuzzy synthetic evaluation method is employed to select the type of pile used as the foundation of a residential building in Fuzhou, Fujian Province, China. The results show that fuzzy AHP approach is an easy and efficient way for pile-type selection.

关键词： pile type     fuzzy synthetic evaluation     analytic hierarchy process (AHP)     optimal selection    

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Comparison of shallow tunneling method with pile and rib method for construction of subway station in

Sina AMIRI; Ali Naghi DEHGHAN

《结构与土木工程前沿（英文）》 2022年 第16卷 第6期   页码 704-717 doi: 10.1007/s11709-021-0746-4

摘要： In the present study, a comparison between the new shallow tunneling method (STM) and the traditional pile and rib method (PRM) was conducted to excavate and construct subway stations in the geological conditions of Tehran. First, by selecting Station Z6 located in the Tehran Subway Line 6 as a case study, the construction process was analyzed by PRM. The maximum ground settlement of 29.84 mm obtained from this method was related to the station axis, and it was within the allowable settlement limit of 30 mm. The acceptable agreement between the results of numerical modeling and instrumentation data indicated the confirmation and accuracy of the excavation and construction process of Station Z6 by PRM. In the next stage, based on the numerical model validated by instrumentation data, the value of the ground surface settlement was investigated during the station excavation and construction by STM. The results obtained from STM showed a significant reduction in the ground surface settlement compared to PRM. The maximum settlement obtained from STM was 6.09 mm as related to the front of the excavation face. Also, the sensitivity analysis results denoted that in addition to controlling the surface settlement by STM, it is possible to optimize some critical geometric parameters of the support system during the station excavation and construction.

关键词： shallow tunneling method     pile and rib method     ground surface settlement     subway station construction     numerical modeling    

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ANN-based empirical modelling of pile behaviour under static compressive loading

Abdussamad ISMAIL

《结构与土木工程前沿（英文）》 2018年 第12卷 第4期   页码 594-608 doi: 10.1007/s11709-017-0446-2

摘要： Artificial neural networks have been widely used over the past two decades to successfully develop empirical models for a variety of geotechnical problems. In this paper, an empirical model based on the product-unit neural network (PUNN) is developed to predict the load-deformation behaviour of piles based SPT values of the supporting soil. Other parameters used as inputs include particle grading, pile geometry, method of installation as well as the elastic modulus of the pile material. The model is trained using full-scale pile loading tests data retrieved from FHWA deep foundations database. From the results obtained, it is observed that the proposed model gives a better simulation of pile load-deformation curves compared to the Fleming’s hyperbolic model and t-z approach.

关键词： piles in compression     load-deformation behaviour     product-unit neural network    

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标题 作者 时间 类型 操作

Finite element prediction on the response of non-uniformly arranged pile groups considering progressivefailure of pile-soil system

Qian-Qing ZHANG, Shan-Wei LIU, Ruo-Feng FENG, Jian-Gu QIAN, Chun-Yu CUI

期刊论文

Influence of axial load on the lateral pile groups response in cohesionless and cohesive soil

Jasim M. ABBASA,Zamri CHIK,Mohd Raihan TAHA

期刊论文

Modeling oblique load carrying capacity of batter pile groups using neural network, random forest regression

Tanvi SINGH, Mahesh PAL, V. K. ARORA

期刊论文

DX旋挖挤扩灌注桩群桩数值分析研究

万飞,张德华

期刊论文

Effects of functional groups for CO

Chenkai Gu, Yang Liu, Weizhou Wang, Jing Liu, Jianbo Hu

期刊论文

Characterization and comparison of organic functional groups effects on electrolyte performance for vanadium

期刊论文

Unravelling the bottleneck of phosphonic acid anchoring groups aiming toward enhancing the stability

期刊论文

Development of dimensionless P-I diagram for curved SCS sandwich shell subjected to uniformly distributed

Yonghui WANG, Ximei ZHAI

期刊论文

Insight into the effect of surface carboxyl and amino groups on the adsorption of titanium dioxide for

Wenlong Zhang, Xuyang Zhao, Lin Zhang, Jinwei Zhu, Shanshan Li, Ping Hu, Jiangtao Feng, Wei Yan

期刊论文

DX桩群桩承载性状的数值分析

张清林,陈立宏

期刊论文

Optimum lateral extent of soil domain for dynamic SSI analysis of RC framed buildings on pile foundations

Nishant SHARMA, Kaustubh DASGUPTA, Arindam DEY

期刊论文

DX桩单桩沉降分析

唐松涛,袁希雨,陈立宏

期刊论文

Application of fuzzy analytic hierarchy process model on determination of optimized pile-type

Lei MA, Shuilong SHEN, Jinhui ZHANG, Yang HUANG, Feng SHI

期刊论文

Comparison of shallow tunneling method with pile and rib method for construction of subway station in

Sina AMIRI; Ali Naghi DEHGHAN

期刊论文

ANN-based empirical modelling of pile behaviour under static compressive loading

Abdussamad ISMAIL

期刊论文