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Geotechnical forensic investigation of a slope failure on silty clay soil—A case study

Mohammad Abubakar NAVEED, Zulfiqar ALI, Abdul QADIR, Umar Naveed LATIF, Saad HAMID, Umar SARWAR

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 501-517 doi: 10.1007/s11709-020-0610-y

Abstract: The investigation involved conventional field and laboratory testing and geophysical investigation using

Keywords： forensic geotechnical investigation     slope failure     slope analysis     finite element method     numerical analysis    

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Multiscale stochastic finite element method on random field modeling of geotechnical problems – a fast

Xi F. XU

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 2,   Pages 107-113 doi: 10.1007/s11709-014-0268-4

Abstract: In this study a fast computing procedure based on the MSFEM is developed to solve random field geotechnical

Keywords： multiscale     finite element     settlement     perturbation     random field     geotechnical    

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Independent cover meshless particle method for complex geotechnical engineering

Jianqiu WU, Yongchang CAI

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4,   Pages 515-526 doi: 10.1007/s11709-017-0428-4

Abstract: A new Independent Cover Meshless Particle (ICMP) method is proposed for the analysis of complex geotechnicalformulation and a low computational cost, and is easy for the numerical analysis and modeling of complex geotechnical

Keywords： meshless method     particle method     independent cover     CTM     geotechnical engineering    

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The Application and the Developing Direction of Forensic Toxicological Analysis

Liu Yao

Strategic Study of CAE 2002, Volume 4, Issue 9,   Pages 42-44

Abstract:

This article introduces two cases, in which the result of toxicological analysis provides the important clue to investigator and the evidence to the justice for one case, while the result of toxicological analysis provides the basis for emergency treatment methods for another case. The article introduces two problems of toxicological analysis during the extraction. One is the microanalysis, and the other is how to clear out the protein and fat from biological material. The article thinks that the present level of toxicological analysis for some techniques in China is near that of the developed country in the end of the 20th century, but the standard management is China lags behind. In the future, the development of toxicological analysis should be in accordance with domestic reguirement and aimed at new techniques in the world.

Keywords： forensic toxicological analysis     standard management     extraction from biological material    

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Detecting genetic hypermutability of gastrointestinal tumor by using a forensic STR kit

Anqi Chen, Suhua Zhang, Jixi Li, Chaoneng Ji, Jinzhong Chen, Chengtao Li

Frontiers of Medicine 2020, Volume 14, Issue 1,   Pages 101-111 doi: 10.1007/s11684-019-0698-4

Abstract: low/microsatellite stability (MSI-L/MSS) cases, we employed two commercial kits to determine MSI and forensicThree types of forensic STR alternations, namely, allelic loss, Aadd, and Anew, were identified. 62.4%Given the similar mechanism of the mutations of MSI and forensic STR, the widely used forensic identifier

Keywords： mismatch repair protein deficiency (MMR-D)     microsatellite instability (MSI)     short tandem repeats (STR)     gastrointestinal tumor     hypermutability    

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Development Strategy of Talent Cultivation for Forensic Medicine in China

Hou Yiping, Yun Libing, Zhu Hong, Wang Qian, Cong Bin

Strategic Study of CAE 2019, Volume 21, Issue 2,   Pages 84-88 doi: 10.15302/J-SSCAE-2019.02.009

Abstract: ;">This paper studies the existing experience in China and abroad, analyzes the challenges faced by forensicmedicine: to establish the first-level discipline of forensic medicine to promote the overall strengthof forensic medical science; to establish an eight-year training system for forensic medicine to innovateforensic medicine talent training mode; to set a professional degree for forensic medical postgraduatesexperts; and to provide forensic courses for clinical medical students to enhance their forensic awareness

Keywords： forensic medicine     medical education     talent cultivation     development strategy    

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Consistency Guarantees for Professional Appraisal of Geotechnical Engineering Design under Market Leading

Jian-ye Zheng

Frontiers of Engineering Management 2015, Volume 2, Issue 1,   Pages 82-85 doi: 10.15302/J-FEM-2015012

Abstract: Peer review is central to the process of modern engineering. Open peer review gives the impression that decisions are arrived at in a fair and meritocratic manner with an objective, reliable, consistent process. It is responsible for identifying methodological flaws and for improving the quality. Assistance from somebody in the same discipline is valuable. Clients refer to reviewers as referees since they help to determine the fate of a design. The client sets up a hanging committee to carry out open peer review to decide whether a piece of work should be accepted, revised or rejected. Reviewers in similar specialties make up a professional group. In an open peer review refereeing a retaining and protection structure design of building foundation pit excavation, an outside expert as an assessor, might master the art of review to pay attention to guarantee consistency of processes and outcomes.

Keywords： peer review     foundation pit excavation     retaining and protection structure     design introduction    

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Classification and quantification of excavated soil and construction sludge: A case study in Wenzhou, China

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 2,   Pages 202-213 doi: 10.1007/s11709-021-0795-8

Abstract: urbanization in China, a large amount of excavated soil and construction sludge is being generated from geotechnicalattempted to classify the excavated soil and construction sludge according to their composition and geotechnical

Keywords： excavated soil     construction sludge     geotechnical and underground engineering     production     classification    

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Mechanism of the December 2015 Catastrophic Landslide at the Shenzhen Landfill and Controlling Geotechnical Artical

Yueping Yin,Bin Li,Wenpei Wang,Liangtong Zhan,Qiang Xue,Yang Gao,Nan Zhang,Hongqi Chen,Tiankui Liu,Aiguo Li

Engineering 2016, Volume 2, Issue 2,   Pages 230-249 doi: 10.1016/J.ENG.2016.02.005

Abstract:

This paper presents findings from an investigation of the large-scale construction solid waste (CSWThe investigation of this disaster used a combination of unmanned aerial vehicle surveillance and multistageThe investigation showed that the landfill could be divided into two units based on the moisture in thecatastrophic landslides of municipal solid waste around the world and discuss how to better manage the geotechnical

Keywords： Construction solid waste (CSW)     Landfill landslide     Factor of safety (FOS)     Geotechnical risk    

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Development of Finite Element Limit Analysis Method and Its Applications in Geotechnical Engineering

Zheng Yingren,Zhao Shangyi,Deng Chujian,Liu Weiming,Tang Xiaosong,Zhang Liming

Strategic Study of CAE 2006, Volume 8, Issue 12,   Pages 39-61

Abstract: It is particularly applicable to the analysis and design of geotechnical engineering.early 20th century, finite element limit analysis method has been developed vigorously in domestic geotechnicalIn order to gradually achieon innovation in geotechnical design methods, this paper presented some researchThese mainly include geotechnical safety factor definitions, method principles, the overall failure criterion

Keywords： limit analysis method     finite element method     geotechnical engineering     slope     foundations     tunnel    

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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    

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An investigation on modification mechanism of CH

Qiang XIN, Shanghong HUANG

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 3,   Pages 293-300 doi: 10.1007/s11709-017-0403-0

Abstract: Rising oil price has brought huge cost pressure for low grade highway construction, and it is urgent to find alternative resources. At the same time, there are nearly 50000–60000 tons of low temperature coal output in inner Mongolia region, China, which has high toxicity and high polluting. To make the low temperature coal be applicable for road constructions, the formaldehyde is used as cross linking agent, the concentrated sulfuric acid is used as catalyst, and the chemical modification of low temperature coal tar pitch in Inner Mongolia region is investigated. The road performance (softening point, penetration and ductility) of modified low temperature coal are tested. Results shown that the road performance of modified low temperature coal is increased significantly. Modification mechanism of low temperature coal is studied by Scanning Electron Microscopy and other analytical tools. Results show that, in the modified low temperature coal, resin content increases and the resin fiber diameter becomes larger with the increasing of formaldehyde content.

Keywords： low temperature     coal tar pitch     modification     road performance    

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Multi-scale investigation of active failure for various modes of wall movement

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 961-979 doi: 10.1007/s11709-021-0738-4

Abstract: Retained backfill response to wall movement depends on factors that range from boundary conditions to the geometrical characteristic of individual particles. Hence, mechanical understanding of the problem warrants multi-scale analyses that investigate reciprocal relationships between macro and micro effects. Accordingly, this study attempts a multi-scale examination of failure evolution in cohesionless backfills. Therefore, the transition of retained backfills from at-rest condition to the active state is modeled using the discrete element method (DEM). DEM allows conducting virtual experiments, with which the variation of particle and boundary properties is straightforward. Hence, various modes of wall movement (translation and rotation) toward the active state are modeled using two different backfills with distinct particle shapes (spherical and nonspherical) under varying surcharge. For each model, cumulative rotations of single particles are tracked, and the results are used to analyze the evolution of shear bands and their geometric characteristics. Moreover, dependencies of lateral pressure coefficients and coordination numbers, as respective macro and micro behavior indicators, on particle shape, boundary conditions, and surcharge levels are investigated. Additionally, contact force networks are visually determined, and their influences on pressure distribution and deformation mechanisms are discussed with reference to the associated modes of wall movement and particle shapes.

Keywords： discrete-element modelling     granular materials     retaining walls     particle shape     arching    

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Analytical and numerical investigation into the longitudinal vibration of uniform nanotubes

Masoud MASOUMI,Mehdi MASOUMI

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 2,   Pages 142-149 doi: 10.1007/s11465-014-0292-z

Abstract:

In recent years, prediction of the behaviors of micro and nanostructures is going to be a matter of increasing concern considering their developments and uses in various engineering fields. Since carbon nanotubes show the specific properties such as strength and special electrical behaviors, they have become the main subject in nanotechnology researches. On the grounds that the classical continuum theory cannot accurately predict the mechanical behavior of nanostructures, nonlocal elasticity theory is used to model the nanoscaled systems. In this paper, a nonlocal model for nanorods is developed, and it is used to model the carbon nanotubes with the aim of the investigating into their longitudinal vibration. Following the derivation of governing equation of nanorods and estimation of nondimensional frequencies, the effect of nonlocal parameter and the length of the nanotube on the obtained frequencies are studied. Furthermore, differential quadrature method, as a numerical solution technique, is used to study the effect of these parameters on estimated frequencies for both classical and nonlocal theories.

Keywords： continuum theory     differential quadrature method     nanorod     longitudinal vibration    

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Molecular dynamics investigation of mechanical properties of single-layer phagraphene

Ali Hossein Nezhad SHIRAZI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 495-503 doi: 10.1007/s11709-018-0492-4

Abstract: Phagraphene is a very attractive two-dimensional (2D) full carbon allotrope with very interesting mechanical, electronic, optical, and thermal properties. The objective of this study is to investigate the mechanical properties of this new graphene like 2D material. In this work, mechanical properties of phagraphene have been studied not only in the defect-free form, but also with the critical defect of line cracks, using the classical molecular dynamics simulations. Our study shows that the pristine phagraphene in zigzag direction experience a ductile behavior under uniaxial tensile loading and the nanosheet in this direction are less sensitive to temperature changes as compared to the armchair direction. We studied different crack lengths to explore the influence of defects on the mechanical properties of phagraphene. We also investigated the temperature effect on the mechanical properties of pristine and defective phagraphene. Our classical atomistic simulation results confirm that larger cracks can reduce the strength of the phagraphene. Moreover, it was shown the temperature has a considerable weakening effect on the tensile strength of phagraphene. The results of this study may be useful for the design of nano-devices using the phagraphene.

Keywords： phaqraphene     mechanical properties     crack propaqation     molecular dynamics     thermal effects    

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Title Author Date Type Operation

Geotechnical forensic investigation of a slope failure on silty clay soil—A case study

Mohammad Abubakar NAVEED, Zulfiqar ALI, Abdul QADIR, Umar Naveed LATIF, Saad HAMID, Umar SARWAR

Journal Article

Multiscale stochastic finite element method on random field modeling of geotechnical problems – a fast

Xi F. XU

Journal Article

Independent cover meshless particle method for complex geotechnical engineering

Jianqiu WU, Yongchang CAI

Journal Article

The Application and the Developing Direction of Forensic Toxicological Analysis

Liu Yao

Journal Article

Detecting genetic hypermutability of gastrointestinal tumor by using a forensic STR kit

Anqi Chen, Suhua Zhang, Jixi Li, Chaoneng Ji, Jinzhong Chen, Chengtao Li

Journal Article

Development Strategy of Talent Cultivation for Forensic Medicine in China

Hou Yiping, Yun Libing, Zhu Hong, Wang Qian, Cong Bin

Journal Article

Consistency Guarantees for Professional Appraisal of Geotechnical Engineering Design under Market Leading

Jian-ye Zheng

Journal Article

Classification and quantification of excavated soil and construction sludge: A case study in Wenzhou, China

Journal Article

Mechanism of the December 2015 Catastrophic Landslide at the Shenzhen Landfill and Controlling Geotechnical

Yueping Yin,Bin Li,Wenpei Wang,Liangtong Zhan,Qiang Xue,Yang Gao,Nan Zhang,Hongqi Chen,Tiankui Liu,Aiguo Li

Journal Article

Development of Finite Element Limit Analysis Method and Its Applications in Geotechnical Engineering

Zheng Yingren,Zhao Shangyi,Deng Chujian,Liu Weiming,Tang Xiaosong,Zhang Liming

Journal Article

Centrifuge experiments for shallow tunnels at active reverse fault intersection

Mehdi SABAGH, Abbas GHALANDARZADEH

Journal Article

An investigation on modification mechanism of CH

Qiang XIN, Shanghong HUANG

Journal Article

Multi-scale investigation of active failure for various modes of wall movement

Journal Article

Analytical and numerical investigation into the longitudinal vibration of uniform nanotubes

Masoud MASOUMI,Mehdi MASOUMI

Journal Article

Molecular dynamics investigation of mechanical properties of single-layer phagraphene

Ali Hossein Nezhad SHIRAZI

Journal Article