Analysis of the influence of slope excavation of newly built railway on settlement safety of adjacent existing expressway

2021 ◽  
Author(s):  
Wei Liu ◽  
Jian Lu ◽  
YingShuang Yuan ◽  
HongQing Yang ◽  
Chi Jia
Keyword(s):  
Slope Excavation

Failure Mechanism of a Slope Anti-Sliding Pile

2013 ◽  
Vol 639-640 ◽  
pp. 593-597
Author(s):  
Lin Chen ◽  
Yong Yao ◽  
Jiong Yang ◽  
Zhao Qiang Zhang
Keyword(s):  
Finite Element ◽  
Failure Mechanism ◽  
Reduction Method ◽  
Strength Reduction ◽  
Strength Reduction Method ◽  
Analysis Method ◽  
Feasible Method ◽  
Finite Element Software ◽  
Slope Excavation ◽  
Pile Design

According to finite element strength reduction method，the article has discussed the failure mechanism of anti-sliding pile by using finite element software MIDAS /GTS ，exploration report and anti-sliding pile design data.The comparative analysis shows that the failure of anti-siding pile is contributed by the slope excavation and rainwater.The analysis method and results can provide reference significance to other anti-sliding pile design.This paper also provide a feasible method for prediction of consequence in slope excavation.

scholarly journals Simulation Parameter Test and Seepage Effect Analysis of Pile-Anchor Support for Binary Slope

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Xuhe Gao ◽  
Weiping Tian ◽  
Zhipei Zhang ◽  
Jiachun Li ◽  
Hongliang Qi ◽  
...  
Keyword(s):  
Steady State ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Guizhou Province ◽  
Inspection Method ◽  
Safety Control ◽  
Supporting Structure ◽  
Slope Excavation ◽  
Simulation Parameter ◽  
Simulation Parameters

It is a difficult point in the field of geotechnical engineering to test the simulation parameters of the pile-anchor supporting structure of slope excavation and analyze the effect of seepage on the stress of the structure. This study relies on the right side slope treatment project of a highway in Guizhou Province. Aiming at the defect that the current numerical simulation parameter selection is fuzzy, the deep displacement monitoring data and P value inspection method are used to check the simulation parameters. We establish a 2D finite element model of slope excavation and support. The superposition calculation method of pore water pressure was used to analyze the stress characteristics of the slope-supporting structure after applying steady-state seepage. The analysis shows the following. ① Initial support stage: the steady-state seepage causes the axial force extreme value of the prestressed anchor cable to increase by 11.22% at this stage. ② Secondary support stage: the steady-state seepage reduces the shear limit of the antislide pile by 3.11% and the bending moment by 14.90%. ③ Comparative analysis of the two supporting phases: the newly constructed pile-anchor supporting structure has a significant effect on the original pile-anchor supporting structure. At the same time, the bending and shearing resistance of the newly added antislide piles has not been fully exerted. The research results provide new ideas for the research on the safety control ability of the slope support construction process.

scholarly journals Simulation Parameter Selection and Steady Seepage Analysis of Binary Structure Slope

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2747
Author(s):  
Xuhe Gao ◽  
Baocheng Cheng ◽  
Weiping Tian ◽  
Zhipei Zhang ◽  
Jiachun Li ◽  
...  
Keyword(s):  
Steady State ◽  
Safety Factor ◽  
Water Pressure ◽  
Soil Layer ◽  
Equivalent Strain ◽  
Extreme Value ◽  
Test Method ◽  
Seepage Analysis ◽  
Binary Structure ◽  
Slope Excavation

The selection of calculation parameters for slope excavation support design and the analysis of seepage stability is a significant challenge. This difficulty also hinders the development of slope support engineering. This study examined the right binary structure slope engineering of the K5 + 220–K5 + 770 section of the TJ1A mark of the Jiangkou-Weng’an Highway in Guizhou province. In this study, we propose and use the deep displacement monitoring data and p value test method to check the simulation parameters. Furthermore, the superposition calculation method for steady-state seepage analysis of slope geotechnical structure is proposed. A comparative analysis of the displacement, strain, stress, and safety factor of the slope after the application of pore water pressure was carried out for three slope conditions. The analysis showed that steady-state seepage has a significant effect on the displacement of the slope during the completion of excavation. As a result, a continuous distribution of strain arises on the slope along the interface between the potential sliding surface and the rock–soil layer, and then forms a continuous sliding zone. Additionally, steady-state seepage has a significant effect on the position of the displacement distribution during the initial support of the slope, leading to a significant increase in the extreme value of the shear outlet displacement of the potential slip surface of the slope and in the extreme value of equivalent strain. Finally, steady-state seepage reduces the displacement and equivalent strain upon construction of the secondary slope support. The steady-state seepage has a limited effect on the stress concentration, but reduces the safety factor calculated using the strength reduction method, in all three stages of slope excavation and support. This study enriches the analysis methods for determining the stability of a dual-structure slope during the rainy season, and provides new ideas for the safety and control of slope support projects.

Assessment Method of Slope Excavation Quality based on Point Cloud Data

2019 ◽  
Vol 23 (3) ◽  
pp. 935-946 ◽  
Author(s):  
Zhiguo Pan ◽  
Yihong Zhou ◽  
Chunju Zhao ◽  
Chao Hu ◽  
Huawei Zhou ◽  
...  
Keyword(s):  
Point Cloud ◽  
Assessment Method ◽  
Point Cloud Data ◽  
Cloud Data ◽  
Slope Excavation

scholarly journals Numerical Analysis and Deformation Mechanism Study on an Excavated High-Steep Slope of a Hydropower Station

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Guangcheng Shi ◽  
Yifeng Wang ◽  
Yingkui Wang ◽  
Zhigang Tao ◽  
Liangpeng Wan ◽  
...  
Keyword(s):  
Slope Stability ◽  
Tensile Stress ◽  
Plastic Zone ◽  
Deformation Mechanism ◽  
Three Dimensional ◽  
Rock Slope Stability ◽  
Plastic State ◽  
Mechanism Study ◽  
Factors Affecting ◽  
Slope Excavation

The high-steep rock slope stability is one of the key technologies in the construction of water conservancy and hydropower projects, which affects and restricts the development of hydraulic resources and the construction of hydropower projects. In this paper, a three-dimensional numerical model was built incorporating stratigraphy, geological structures, and the inverted rock mechanical parameters to perform displacement, stress, and plastic zone analyses for an excavated slope in China using the FLAC3D software. The numerical simulation results after slope excavation show that the deformation near the fault fracture zone is the largest, ranging from 350 mm to 380 mm. The compressive stress is concentrated on the slope foot and the connecting part, the stress value is 2 MPa∼5 MPa, there is a large tensile stress area in the slope, and the tensile stress value is 0 MPa∼0.4 MPa. The plastic zone of the slope is concentrated near the fault F6 and the structural influence zone, and the rock mass of the slope basically enters the plastic state. On this basis, the deformation mechanism of slope was analyzed, while the internal and external factors affecting the slope deformation were described in detail. This work would provide an effective reference basis for slope stability evaluation and treatment of similar hydropower stations.

Numerical Simulation of Slope Excavation in Highway Renovation and Expansion Project

2014 ◽  
Vol 580-583 ◽  
pp. 827-830
Author(s):  
Gen Chuan Luo ◽  
Zhong Ming He ◽  
Xin Luo ◽  
Qing Guo Hu
Keyword(s):  
Numerical Simulation ◽  
Stability Analysis ◽  
Stress And Strain ◽  
Regular Pattern ◽  
Expansion Process ◽  
Excavation Process ◽  
Slope Excavation ◽  
Object Use ◽  
Simulation Results ◽  
And Control

Slope stability analysis requires detect and control the stress and strain timely. Familiar with the slope‘s stress and strain changes in excavation process has important guiding significance for the actual construction. In this paper, choose a slope in Guangxi freeway renovation and expansion process as the research object. Use FLAC3D to analysis the stress and displacement simulation results of this slope excavation step by step. Summarize the excavation regular pattern.

FULL-SCALE MODEL TEST FOR PREDICTING COLLAPSE USING INVERSE OF VELOCITY OF SLOPE SURFACE DURING EXCAVATION

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Nobutaka Hiraoka ◽  
Naotaka Kikkawa ◽  
Katsuo Sasahara ◽  
Kazuya Itoh
Keyword(s):  
Occupational Safety ◽  
Slope Failure ◽  
Surface Displacement ◽  
Warning Signal ◽  
Full Scale ◽  
Scale Model ◽  
Slope Surface ◽  
Rock Falls ◽  
Elapsed Time ◽  
Slope Excavation

Predicting the onset of slope failure or rock falls is important for occupational safety because they kill approximately ten to 20 workers every year in Japan. Approximately half of such victims are from slope failure during slope excavation and construction. In order to predict the time of slope failure during an excavation, a full-scale model slope was built, and the displacement of the slope surface was monitored during slope excavation. The surface displacement rapidly increased with the elapsed time after the excavation, and the relationship between the displacement and elapsed time included an exponential function just before collapse. Based on the results, by computing the inverse of the velocity of the slope surface displacement obtained in ten-second intervals, a warning signal can be provided five min before collapse.

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