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Stability analysis of layered slopes in unsaturated soils

Guangyu DAI; Fei ZHANG; Yuke WANG

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 3,   Pages 378-387 doi: 10.1007/s11709-022-0808-2

Abstract: This study presents stability analyses of layered soil slopes in unsaturated conditions and uses a limitequilibrium method to determine the factor of safety involving suction stress of unsaturated soil.An example of a two-layered slope in clay and silt is selected to verify the used method by comparing

Keywords: slope stability     suction stress     unsaturated soil     layered slope     limit equilibrium    

Slope stability analysis based on big data and convolutional neural network

Yangpan FU; Mansheng LIN; You ZHANG; Gongfa CHEN; Yongjian LIU

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 7,   Pages 882-895 doi: 10.1007/s11709-022-0859-4

Abstract: The Limit Equilibrium Method (LEM) is commonly used in traditional slope stability analyses, but it isThis study proposes a slope database generation method based on the LEM.The results show that the slope stability prediction method based on the CNN does not need complex calculationsamples for the CNN, which improves the prediction speed and practicability of the CNN-based evaluation method

Keywords: slope stability     limit equilibrium method     convolutional neural network     database for slopes     big data    

Stability and deformation analysis of high slope for tank type of bunker at Donglutian coal mine

Jiang Haibo,Gong Shoucai,Liu Qingxue

Strategic Study of CAE 2012, Volume 14, Issue 2,   Pages 107-112

Abstract: calculation and deformation analysis of excavation slope under different conditions are made, using the limitequilibrium method and the finite element method.Reinforcement was applied in the slope, by method of composite soil nail wall and bored piles+entry cupporting

Keywords: tank type of bunker     slope     limit equilibrium method     finite element method (FEM)     stability     deformation    

New pseudo-dynamic analysis of two-layered cohesive-friction soil slope and its numerical validation

Suman HAZARI, Sima GHOSH, Richi Prasad SHARMA

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6,   Pages 1492-1508 doi: 10.1007/s11709-020-0679-3

Abstract: In this study, the limit equilibrium modified pseudo-dynamic method is used to analyze the stabilityNew formulations derived from an analytical method are proposed for the predicting the seismic responseThe results of the present method were compared with those in the available literature.

Keywords: layered soil     limit equilibrium method     seismic analysis     damping     PLAXIS    

A projected Newton algorithm based on chemically allowed interval for chemical equilibrium computations

Frontiers of Chemical Science and Engineering 2024, Volume 18, Issue 3, doi: 10.1007/s11705-024-2390-8

Abstract: The chemical equilibrium equations utilized in reactive transport modeling are complex and nonlinear,and are typically solved using the Newton-Raphson method.This method constrains the Newton step by utilizing a chemically allowed interval that generates feasibleMoreover, we utilize the positive continuous fraction method as a preconditioning technique, providingmethod based on chemically allowed interval updating rules, and the bounded variable least squares method

Keywords: chemical equilibrium     reactive transport modeling     numerical methods     projected Newton method    

Seismic stability of earth slopes with tension crack

Yundong ZHOU, Fei ZHANG, Jingquan Wang, Yufeng GAO, Guangyu DAI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 4,   Pages 950-964 doi: 10.1007/s11709-019-0529-3

Abstract: Cracks at the crest of slopes frequently occur during earthquakes. Such cracks result from limited tension strength of the soil. A tension cut-off in Mohr-Coulomb shear strength can represent this limited strength. Presented is an extension of variational analysis of slope stability with a tension crack considering seismicity. Both translational and rotational failure mechanisms are included in a pseudo-static analysis of slope stability. Developed is a closed-form to assess the seismic stability of slopes with zero tensile strength. The results indicate that the presence of the tension crack has significant effects on the seismic stability of slopes, i.e. leading to small value of the yield acceleration. Considering soil tension strength in seismic slope analysis may lead to overestimation on the stability, as much as 50% for vertical slopes. Imposing tension crack results in transit of the critical failure mode to a straight line from a log-spiral, except for flat slopes with small soil cohesion. Under seismic conditions, large cohesion may increase the depth of crack, moving it closer to the slope.

Keywords: slope stability     tension     crack     limit equilibrium     seismic effect    

Axial compression behavior of CFRP-confined rectangular concrete-filled stainless steel tube stub column

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1144-1159 doi: 10.1007/s11709-021-0762-4

Abstract: A bearing capacity prediction method was proposed based on the twin-shear strength theory, combiningthe limit equilibrium state of the CFRP-confined CFSST stub column under axial compression.The prediction method was calibrated by the test data in this study and other literature.The results show that the prediction method is of high accuracy.

Keywords: CFRP     rectangular CFSST stub column     bearing capacity     limit equilibrium state     twin-shear strength theory    

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:

Finite element limit analysis method has the advantage of combining numerical analysis method withtraditional limit equilibrium methods.In the early 20th century, finite element limit analysis method has been developed vigorously in domesticThese mainly include geotechnical safety factor definitions, method principles, the overall failure criterionThis method has also been used for searching sliding surface of complex landslide, retaining structure

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

Foundations bearing capacity subjected to seepage by the kinematic approach of the limit analysis

Mehdi VEISKARAMI, Ghasem HABIBAGAHI

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4,   Pages 446-455 doi: 10.1007/s11709-013-0227-5

Abstract: The kinematic approach of the limit analysis was employed to find the upper-bound limit of the bearing

Keywords: foundation     bearing capacity     limit analysis     numerical computation     plasticity     seepage    

Thermodynamic analysis of reaction pathways and equilibrium yields for catalytic pyrolysis of naphtha

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 12,   Pages 1700-1712 doi: 10.1007/s11705-022-2207-6

Abstract: Herein, for a better catalyst design and operation parameters optimization, the reaction pathways and equilibriumIn addition, the equilibrium yield of light olefins increased with increasing the chain length, and the

Keywords: naphtha     catalytic pyrolysis     reaction pathway     equilibrium yield    

Modeling limit force capacities of high force to volume lead extrusion dampers

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 609-622 doi: 10.1007/s11709-021-0724-x

Abstract: Lead extrusion dampers are supplemental energy-dissipation devices that are used to mitigate seismic structural damage. Small volumetric sizes and high force capacities define high-force-to-volume (HF2V) devices, which can absorb significant response energy without sacrificial damage. However, the design of such devices for specific force capacities has proven difficult based on the complexities of their internal reaction mechanisms, leading to the adoption of empirical approaches. This study developed upper- and lower-bound force capacity estimates from analytical mechanics based on direct and indirect metal extrusion for guiding design. The derived equations are strictly functions of HF2V device geometric parameters, lead material properties, and extrusion mechanics. The upper-bound estimates from direct and indirect extrusion are denoted as (FUB,1, FUB,2) and (FUB,3, FUB,4), respectively, and the lower-bound estimates are denoted as (FLB, FLB,1) based on the combination of extrusion and friction forces. The proposed models were validated by comparing the predicted bounds to experimental force capacity data from 15 experimental HF2V device tests. The experimental device forces all lie above the lower-bound estimates (FLB, FLB,1) and below the upper-bound estimates (FUB,1, FUB,2, FUB,4). Overall, the (FLB, FUB,2) pair provides wider bounds and the (FLB,1, FUB,4/FUB,1) pair provides narrower bounds. The (FLB,1, FUB,1) pair has a mean lower-bound gap of 36%, meaning the lower bound was 74% of the actual device force on average. The mean upper-bound gap was 33%. The bulge area and cylinder diameter of HF2V devices are key parameters affecting device forces. These relatively tight bounds provide useful mechanics-based predictive design guides for ensuring that device forces are within the targeted design range after manufacturing.

Keywords: extrusion     lead dampers     upper and lower bound     analytical modelling     limit force    

3D fracture modelling and limit state analysis of prestressed composite concrete pipes

Pengfei HE, Yang SHEN, Yun GU, Pangyong SHEN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1,   Pages 165-175 doi: 10.1007/s11709-018-0484-4

Abstract: This allows the method to capture important phenomena compared to a pure shell model of concrete.chosen when concrete is subjected to compressive loading while a combined continuous-discrete fracture method

Keywords: cylindrical concrete structures     limit state analysis     3D fracture modelling     prestressed composite pipes    

Setting up a heart rate alarm limit to decrease oculocardiac reflex during strabismus surgery in children

ZHANG Kangkang, GU Enhua, LU Junjie

Frontiers of Medicine 2008, Volume 2, Issue 3,   Pages 295-297 doi: 10.1007/s11684-008-0056-4

Abstract: The aim of this paper is to investigate a method which may decrease the incidence and severity of oculocardiacThis method significantly decreased the incidence and severity of OCR during strabismus surgery in children

Measurement and correlation of the solid-liquid equilibrium of 2-(

Yanhong SUN, Zhiyong LI, Chuang XIE, Wei CHEN, Cui ZHANG

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 1,   Pages 110-115 doi: 10.1007/s11705-013-1316-7

Abstract: The binary solid-liquid equilibrium (SLE) of both compounds were predicted by integrated computer aided

Keywords: solid-liquid equilibrium (SLE)     eutectic     integrated computer aided system (ICAS)     TOPEM     correlation    

Presetting Method for Embodied Carbon Emission Limit of Building Structures

Xiao Jianzhuang, Xia Bing,Xiao Xuwen,Hu Xiaolong,Ding Tao,Zhou Ying,Zhu Hehua

Strategic Study of CAE 2023, Volume 25, Issue 2,   Pages 187-197 doi: 10.15302/J-SSCAE-2023.02.016

Abstract:

The embodied carbon emission limit is a key parameter for quantitativelynewly built and existing buildings in building structure retention and demand, which provides limitFurthermore, suggestions for research related to carbon emission limit are provided from the aspects

Keywords: building structures     embodied carbon emission limit     carbon emission reduction target decomposition    

Title Author Date Type Operation

Stability analysis of layered slopes in unsaturated soils

Guangyu DAI; Fei ZHANG; Yuke WANG

Journal Article

Slope stability analysis based on big data and convolutional neural network

Yangpan FU; Mansheng LIN; You ZHANG; Gongfa CHEN; Yongjian LIU

Journal Article

Stability and deformation analysis of high slope for tank type of bunker at Donglutian coal mine

Jiang Haibo,Gong Shoucai,Liu Qingxue

Journal Article

New pseudo-dynamic analysis of two-layered cohesive-friction soil slope and its numerical validation

Suman HAZARI, Sima GHOSH, Richi Prasad SHARMA

Journal Article

A projected Newton algorithm based on chemically allowed interval for chemical equilibrium computations

Journal Article

Seismic stability of earth slopes with tension crack

Yundong ZHOU, Fei ZHANG, Jingquan Wang, Yufeng GAO, Guangyu DAI

Journal Article

Axial compression behavior of CFRP-confined rectangular concrete-filled stainless steel tube stub column

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

Foundations bearing capacity subjected to seepage by the kinematic approach of the limit analysis

Mehdi VEISKARAMI, Ghasem HABIBAGAHI

Journal Article

Thermodynamic analysis of reaction pathways and equilibrium yields for catalytic pyrolysis of naphtha

Journal Article

Modeling limit force capacities of high force to volume lead extrusion dampers

Journal Article

3D fracture modelling and limit state analysis of prestressed composite concrete pipes

Pengfei HE, Yang SHEN, Yun GU, Pangyong SHEN

Journal Article

Setting up a heart rate alarm limit to decrease oculocardiac reflex during strabismus surgery in children

ZHANG Kangkang, GU Enhua, LU Junjie

Journal Article

Measurement and correlation of the solid-liquid equilibrium of 2-(

Yanhong SUN, Zhiyong LI, Chuang XIE, Wei CHEN, Cui ZHANG

Journal Article

Presetting Method for Embodied Carbon Emission Limit of Building Structures

Xiao Jianzhuang, Xia Bing,Xiao Xuwen,Hu Xiaolong,Ding Tao,Zhou Ying,Zhu Hehua

Journal Article