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Shallow foundation response variability due to soil and model parameter uncertainty

Prishati RAYCHOWDHURY,Sumit JINDAL

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 3,   Pages 237-251 doi: 10.1007/s11709-014-0242-1

Abstract: present work intends to investigate the effect of soil and model parameter uncertainty on the response of shallowThe sensitivity of both soil and model input parameters on shallow foundation responses are investigatedIt has been observed that the degree of accuracy in predicting the responses of the shallow foundation

Keywords： shallow foun dation     sensitivity analysis     centrifuge data     first-order-second-moment (FOSM) method     parameter    

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Mechanical responses of multi-layered ground due to shallow tunneling with arbitrary ground surface load

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5,   Pages 745-762 doi: 10.1007/s11709-023-0935-4

Abstract: analytical model based on complex variable theory is proposed to investigate ground responses due to shallowThe present model is superior to the classical model for analyzing ground responses of shallow tunnelingthus, it can be used with assurance to estimate the ground movement and surface building safety of shallow

Keywords： analytical model     mechanical response     multi-layered ground     shallow tunneling     ground surface load    

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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

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 6,   Pages 704-717 doi: 10.1007/s11709-021-0746-4

Abstract: In the present study, a comparison between the new shallow tunneling method (STM) and the traditional

Keywords： shallow tunneling method     pile and rib method     ground surface settlement     subway station construction    

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Centrifuge experiments for shallow tunnels at active reverse fault intersection

Mehdi SABAGH, Abbas GHALANDARZADEH

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3,   Pages 731-745 doi: 10.1007/s11709-020-0614-7

Abstract: Tunnels extend in large stretches with continuous lengths of up to hundreds of kilometers which are vulnerable to faulting in earthquake-prone areas. Assessing the interaction of soil and tunnel at an intersection with an active fault during an earthquake can be a beneficial guideline for tunnel design engineers. Here, a series of 4 centrifuge tests are planned and tested on continuous tunnels. Dip-slip surface faulting in reverse mechanism of 60-degree is modeled by a fault simulator box in a quasi-static manner. Failure mechanism, progression and locations of damages to the tunnels are assessed through a gradual increase in Permanent Ground Displacement (PGD). The ground surface deformations and strains, fault surface trace, fault scarp and the sinkhole caused by fault movement are observed here. These ground surface deformations are major threats to stability, safety and serviceability of the structures. According to the observations, the modeled tunnels are vulnerable to reverse fault rupture and but the functionality loss is not abrupt, and the tunnel will be able to tolerate some fault displacements. By monitoring the progress of damage states by increasing PGD, the fragility curves corresponding to each damage state were plotted and interpreted in related figures.

Keywords： reverse fault rupture     continuous tunnel     geotechnical centrifuge     ground surface deformations     fragility curves    

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Strategic Thinking on Shallow-water Oil and Gas Exploration in Offshore China

Ke-qiang Wu,Jian-yong Xu,Bo Kang

Frontiers of Engineering Management 2016, Volume 3, Issue 4,   Pages 349-355 doi: 10.15302/J-FEM-2016056

Abstract: offshore China has made great achievements, and as the important areas of offshore exploration, the shallowTherefore, for effective exploration of shallow-water oil and gas in offshore China, it is necessary

Keywords： offshore China     shallow-water oil and gas exploration     strategic thinking     challenge     countermeasure    

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Control concept and countermeasures for shallow lakes' eutrophication in China

JIN Xiangcan, LU Shaoyong, HU Xiaozhen, JIANG Xia, WU Fengchang

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 3,   Pages 257-266 doi: 10.1007/s11783-008-0063-3

Abstract: Research on lake eutrophication in China began in the early 1970s, and many lakes in China are now known to be in meso-eutrophic status. Lake eutrophication has been showing a rapidly increasing trend since 2000. Investigations show that the main reasons for lake eutrophication include a fragile lake background environment, excessive nutrient loading into lakes, excessive human activities, ecological degeneration, weak environmental protection awareness, and lax lake management. Major mechanisms resulting from lake eutrophication include nutrient recycling imbalance, major changes in water chemistry (pH, oxygen, and carbon), lake ecosystem imbalance, and algal prevalence in lakes. Some concepts for controlling eutrophication should be persistently proposed, including lake catchment control, combination of pollutant source control with ecological restoration, protection of three important aspects (terrestrial ecology, lake coast zone, and submerged plant), and combination of lake management with regulation. Measures to control lake eutrophication should include pollution source control (i.e., optimize industrial structural adjustments in the lake catchment, reduce nitrogen and phosphorus emission amounts, and control endogenous pollution) and lake ecological restoration (i.e. establish a zone-lake buffer region and lakeside zone, protect regional vegetation, utilize hydrophytes in renovation technology); countermeasures for lake management should include implementing water quality management, identifying environmental and lake water goals, legislating and formulating laws and regulations to protect lakes, strengthening publicity and the education of people, increasing public awareness through participation in systems and mechanic innovations, establishing lake region management institutions, and ensuring implementation of governance and management measures.

Keywords： excessive     participation     prevalence     lakeside     Research    

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Research on Demarcating Method for Deep Tunnel and Shallow Tunnel in Soil

Zhao Zhanchang,Xie Yongli

Strategic Study of CAE 2005, Volume 7, Issue 10,   Pages 84-86

Abstract:

Directed against the demarcating problems of deep tunnel and shallow tunnel in exiting methods, the

Keywords： soil tunnel     deep tunnel and shallow tunnel     demarcating method    

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Numerical simulation of flood inundation processes by 2D shallow water equations

ZHANG Xinhua, LONG Wenfei, XIE Heping, ZHU Jiahua, WANG Jiangping

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 1,   Pages 107-113 doi: 10.1007/s11709-007-0011-5

Abstract: and to reduce the loss of lives and properties in urban areas, a numerical simulation model using 2D shallow

Keywords： control     satisfactory     management     central     rescue    

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Reliability assessment of three-dimensional bearing capacity of shallow foundation using fuzzy set theory

Rajarshi PRAMANIK, Dilip Kumar BAIDYA, Nirjhar DHANG

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2,   Pages 478-489 doi: 10.1007/s11709-021-0698-8

Abstract: The aim of this study is to investigate the applicability of reliability theory on surface square/rectangular footing against bearing capacity failure using fuzzy set theory in conjunction with the finite element method. Soil is modeled as a three-dimensional spatially varying medium, where its parameters (cohesion, friction angle, unit weight, etc.) are considered as fuzzy variables that maintain some membership functions. Soil is idealized as an elastic-perfectly plastic material obeying the Mohr–Coulomb failure criterion, where both associated and non-associated flow rules are considered in estimating the ultimate bearing capacity of the footing. The spatial variability of the soil is incorporated for both isotropic and anisotropic fields, which are determined by the values of scales of fluctuation in both the horizontal and vertical directions. A new parameter namely, limiting applied pressure at zero failure probability is proposed, and it indirectly predicts the failure probability of the footing. The effect of the coefficient of variation of the friction angle of the soil on the probability of failure is analyzed, and it is observed that the effect is significant. Furthermore, the effect of the scale of fluctuation on the probability of failure is investigated, and the necessity for considering spatial variability in the reliability analysis is well proven.

Keywords： finite element method     square footing     reliability analysis     fuzzy set theory     coefficient of variation     spatial variability    

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Three-dimensional finite difference analysis of shallow sprayed concrete tunnels crossing a reverse fault

Masoud RANJBARNIA, Milad ZAHERI, Daniel DIAS

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4,   Pages 998-1011 doi: 10.1007/s11709-020-0621-8

Abstract: In this paper, the effects of a reverse and a normal fault movement on a transversely crossing shallow

Keywords： urban tunnel     sprayed concrete     reverse fault     normal fault     finite difference analysis    

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Study on support mechanical behaviour and scheme for shallow buried tunnel in weak wall rock with rich

Wan Fei,Tan Zhongsheng,Yang Sensen,Ma Dong

Strategic Study of CAE 2014, Volume 16, Issue 8,   Pages 45-53

Abstract:

Shallow buried section under river valley of Guan Jiao tunnel has doneThese research results can provide theoretical basis and underlying date for support scheme for Shallow

Keywords： Tunnel project     Shallow buried under river valley     Weak wall rock     Support scheme     Field monitoring    

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Field measurement and analysis of asymmetric shallow buried twin tunnels with ultra small spacing

Wang Yunlong,Tan Zhongsheng,Chen Ying

Strategic Study of CAE 2012, Volume 14, Issue 11,   Pages 24-28

Abstract:

The ultra-small spacing tunnel of Jiaozhou Bay seabed tunnel in Qingdao is took for example; the surrounding rock pressure features and support force are analyzed through the field measurement. Results show that the surrounding rock pressure and support force of the after-excavation tunnel are larger than others of the tunnel. This result is different from the theoretical predictions and experimental results of most of the small spacing symmetry tunnel. To alleviate these problems effectively, support parameters are adjusted opportunely; the radial support capacity of the after-excavation tunnel is enhanced, and reinforcement measures of rock pillar are made at the same time. The monitoring results show that the stability of the after-construction tunnel has been effectively controlled, which provides useful reference for the design and construction of similar tunnels with small spacing.

Keywords： tunnel     ultra-small spacing     asymmetric     shallow-buried     field measurement    

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Characterization of phosphorus species and modeling for its organic forms in eutrophic shallow lake sediments

Hongguang CHENG,Xiao PU,Yiting CHEN,Fanghua HAO,Liming DONG

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 6,   Pages 905-921 doi: 10.1007/s11783-014-0650-4

Abstract: Variations of phosphorus (P) and its species in surface sediment of Baiyangdian Lake, a eutrophic shallow

Keywords： phosphorus fractionation     variation characteristics     modeling     sediment     Baiyangdian Lake    

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Study on three-dimensional numerical model for shallow water flow

Ding Daoyang,Wu Shiqiang

Strategic Study of CAE 2010, Volume 12, Issue 2,   Pages 32-39

Abstract:

A three-dimensional numerical model for shallow flow based on a layer-integratedTherefore, the present 3D shallow flow model is a robust and efficient tool for simulating the shallow

Keywords： three-dimensional flow model     numerical simulation     mending channel     shallow water flow    

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Two dimensional value simulation of shallow water equation

Xiang Bo,Mi Xiao,Ji Changming,Luo Qingsong

Strategic Study of CAE 2008, Volume 10, Issue 7,   Pages 118-124

Abstract: triangular mesh adapts to complex irregular boundary.Based on this,adopting finite volume method to disperse shallow

Keywords： shallow water equation     finite volume method     unstructured mesh     dam-break    

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Title Author Date Type Operation

Shallow foundation response variability due to soil and model parameter uncertainty

Prishati RAYCHOWDHURY,Sumit JINDAL

Journal Article

Mechanical responses of multi-layered ground due to shallow tunneling with arbitrary ground surface load

Journal Article

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

Sina AMIRI; Ali Naghi DEHGHAN

Journal Article

Centrifuge experiments for shallow tunnels at active reverse fault intersection

Mehdi SABAGH, Abbas GHALANDARZADEH

Journal Article

Strategic Thinking on Shallow-water Oil and Gas Exploration in Offshore China

Ke-qiang Wu,Jian-yong Xu,Bo Kang

Journal Article

Control concept and countermeasures for shallow lakes' eutrophication in China

JIN Xiangcan, LU Shaoyong, HU Xiaozhen, JIANG Xia, WU Fengchang

Journal Article

Research on Demarcating Method for Deep Tunnel and Shallow Tunnel in Soil

Zhao Zhanchang,Xie Yongli

Journal Article

Numerical simulation of flood inundation processes by 2D shallow water equations

ZHANG Xinhua, LONG Wenfei, XIE Heping, ZHU Jiahua, WANG Jiangping

Journal Article

Reliability assessment of three-dimensional bearing capacity of shallow foundation using fuzzy set theory

Rajarshi PRAMANIK, Dilip Kumar BAIDYA, Nirjhar DHANG

Journal Article

Three-dimensional finite difference analysis of shallow sprayed concrete tunnels crossing a reverse fault

Masoud RANJBARNIA, Milad ZAHERI, Daniel DIAS

Journal Article

Study on support mechanical behaviour and scheme for shallow buried tunnel in weak wall rock with rich

Wan Fei,Tan Zhongsheng,Yang Sensen,Ma Dong

Journal Article

Field measurement and analysis of asymmetric shallow buried twin tunnels with ultra small spacing

Wang Yunlong,Tan Zhongsheng,Chen Ying

Journal Article

Characterization of phosphorus species and modeling for its organic forms in eutrophic shallow lake sediments

Hongguang CHENG,Xiao PU,Yiting CHEN,Fanghua HAO,Liming DONG

Journal Article

Study on three-dimensional numerical model for shallow water flow

Ding Daoyang,Wu Shiqiang

Journal Article

Two dimensional value simulation of shallow water equation

Xiang Bo,Mi Xiao,Ji Changming,Luo Qingsong

Journal Article