FLAC3D Numerical Simulation Study on Deformation of Subgrade Construction Process

2011 ◽  
Vol 90-93 ◽  
pp. 466-470
Author(s):  
Ya Ni Lu ◽  
Gai Wei Li
Keyword(s):  
Numerical Simulation ◽  
Elastic Modulus ◽  
Simulation Study ◽  
Simulation Analysis ◽  
Lateral Displacement ◽  
Unit Weight ◽  
Deformation Characteristics ◽  
Construction Process ◽  
Main Research ◽  
Road Slope

Numerical simulation analysis of the deformation characteristics in the construction process of subgrade are conducted. Based on the different filling unit weight and roadbed elastic modulus conditions, the main research is that vertical settlement of roadbed center and the horizontal lateral displacement of road slope toe change with the increase of the depth of filling. It is believed that the lightweight filling should be selected or the roadbed elastic modulus will be enhanced as much as possible under the condition that satisfies various standard, which can improve the settlement deformation of highway.

scholarly journals Theoretical Research and Numerical Simulation on Water Resistance Mechanism of Textile Bag in Water Passage

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Ang Li ◽  
Yuxuan Yang ◽  
Mingcheng Zhu ◽  
Wenzhong Zhang ◽  
Bingnan Ji ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Water Resistance ◽  
Simulation Analysis ◽  
Water Pressure ◽  
Water Inrush ◽  
Deformation Characteristics ◽  
Water Blocking ◽  
The Stability ◽  
Water Passage

It is an important problem in the mine water disaster prevention and control to control the large passage moving water. Traditional grouting technology is to put coarse aggregate and fine aggregate downward first and then grouting treatment. But the aggregate and cement flow distance is long, consumption is large, cost is high, and easy to appear secondary water inrush. Centering on the technical difficulties in the rapid construction of the blocking body of the moving water passage, a water-blocking textile bag was invented. The purpose of blocking the tunnel water inrush was achieved by grouting inside the bag body, which fundamentally realized the rapid blocking of the large passage through water under the condition of moving water. However, the mechanism, water plugging law, and design parameters of water blocking roadway with textile bag are still unclear. In this paper, the slip law and stability of the textile bag in the moving water and the deformation characteristics caused by the dynamic water pressure are theoretically analyzed and simulated. Through theoretical analysis, the ultimate antihydraulic stress value of a textile bag of a certain specification is calculated, and the parameters of the textile bag that affect the stability of the bag body are also determined. Xflow was used for numerical simulation analysis to study the deformation characteristics of the textile bag under water and the law of water barrier. The simulation analysis focuses on the water resistance effect and flow field distribution characteristics of the textile bag in the water passage under the condition of low flow rate and low pressure, as well as the stability and self-deformation characteristics of the textile bag under the condition of high flow rate and high pressure. The accuracy of the limit resistance to water pressure of the textile bag obtained from theoretical analysis is verified. The results show that the theoretical analysis is consistent with the simulation results. The textile bag can realize the fast controllable plugging of the large water passage of moving water within the limit of the antihydraulic stress.

scholarly journals Investigation of Anisotropy on Deterioration of Mechanical Parameters of Layered Rock Under Freeze-thaw Cycles

2021 ◽  
Author(s):  
Guangkeng Zhang ◽  
Lianrong Wu ◽  
Huiyun Wang ◽  
Zhipeng Li ◽  
Baosheng Shi ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Rock Slope ◽  
Simulation Analysis ◽  
Deformation Characteristics ◽  
Mechanical Parameters ◽  
Compression Tests ◽  
Freezing And Thawing ◽  
Copper Mine ◽  
Freeze Thaw ◽  
Layered Rock

Abstract The evaluation of slope deformation and stability under freeze-thaw cycles is an important research direction and a challenge for geotechnical engineering in cold regions. However, most previous studies only considered the influence of the number of freeze-thaw cycles, but ignored the anisotropic characteristics of layered rock slopes. Meanwhile, the number of freeze-thaw cycles and the bedding dip are rarely considered in previous numerical simulations. Based on this background, the carbonaceous slate of the Pulang copper mine in China was used as the sample material to perform uniaxial compression tests on seven types of carbonaceous slate with different bedding dip angles after completing six different times of freeze-thaw cycles. The test results are applied to the numerical simulation analysis of the deformation characteristics and stability of the layered rock slope of the copper mine. The results show that freezing and thawing will cause layered rock degradation effects, thereby reducing rock mechanical parameters, and the influence is most obvious when the bedding dip is approximately 45°. In the numerical simulation, it is found that the deformation characteristics and stability change trend of the layered rock slope are similar to the above-mentioned experiments. In addition, it is necessary to consider the number of freeze-thaw cycles and the bedding dip to avoid too much difference for the maximum horizontal displacement of a layered rock slope. This study provides a feasible evaluation plan for the deformation characteristics and stability of the layered rock slope in Pulang area of China.

Three-Dimensional Numerical Simulation Analysis of Security of the Underground Diaphragm Wall Based on the Ring Beam Supporting System

2013 ◽  
Vol 790 ◽  
pp. 133-137
Author(s):  
Gan Zhou ◽  
Ke Sheng Ding ◽  
Shun Jian Yi ◽  
Zhi Guang Fan
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Lateral Displacement ◽  
Three Dimensional ◽  
Diaphragm Wall ◽  
Foundation Pit ◽  
Supporting System ◽  
Dangerous Zone ◽  
Area Monitoring ◽  
Concrete Ring

The ring beam supporting system is a new kind of reasonable support system, which gives full play to the advantages that the concrete ring beam can bear reinforced huge pressure. Based on the analysis of the horizontal lateral displacement of diaphragm wall with three-dimensional numerical simulation, conclusion is obtained that the most dangerous zone exists in range of middle 1/4 of diaphragm wall, which is 0 ~ 6 m above the excavation surface and should be a key area monitoring. And there is enough space for pitting of earth in the process of foundation excavation, it also makes construction convenient and saves the time and cost of foundation pit support.

Numerical Simulation Analysis on Vertical Displacement of Step Excavation in Foundation Pit Project

2014 ◽  
Vol 651-653 ◽  
pp. 1201-1204
Author(s):  
Fang Guo
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Simulation Analysis ◽  
Vertical Displacement ◽  
Construction Process ◽  
Foundation Pit ◽  
Maximum Settlement ◽  
Displacement Distribution ◽  
Finite Element Software ◽  
Pit Depth

In order to study the vertical displacement distribution of foundation pit in the process of step-by-step excavation, combined with a foundation pit project, numerical simulation analysis with finite element software was carried in the research. The results show that: in the process of excavation, the maximum settlement of soil outside the pit is 41.4 mm, which is 2.95 ‰ of pit excavation depth and conforms to the recommended value in specifications. The maximum vertical displacement of soil at the bottom of foundation pit is in the center of pit. Its value is gradually increasing with the excavation, and the maximum is 60.1 mm, which is 4.32 ‰ of foundation pit depth,also,it conforms to the specifications proposed value. The proposed scheme can satisfy the vertical displacement of foundation pit excavation in the construction process.

Numerical Simulation Study on the Stress - Deformation Characteristics of Rock Mass of Luding Power Transmission Project in Sichuan

2013 ◽  
Vol 368-370 ◽  
pp. 1688-1692
Author(s):  
Lei Wang ◽  
Yu Sheng Li ◽  
Qing Song Huang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Rock Mass ◽  
Simulation Study ◽  
Power Transmission ◽  
Deformation Characteristics ◽  
Horizontal Shear ◽  
Stress Deformation ◽  
Finite Element Numerical Simulation ◽  
Project Site

In this page, combination of finite element numerical simulation and discrete element numerical simulation is used to study the stress - deformation characteristics of rock mass of power transmission project site,whichclarifies the rock mass stress is mainly controlled by thegravitational field,the form of the potential deformationis dominated by compression deformation,andthere is no possibility of occurrence of the horizontal shear deformation.

Numerical Simulation Analysis of Bearing Performance of Extra-Long and Large-Diameter Single Pile

2014 ◽  
Vol 1065-1069 ◽  
pp. 943-948
Author(s):  
Zhi Meng Zhao ◽  
Jin Yi Chai ◽  
Cai Xia Fan
Keyword(s):  
Numerical Simulation ◽  
Elastic Modulus ◽  
Bearing Capacity ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Ultimate Bearing Capacity ◽  
Single Pile ◽  
Pile Shaft ◽  
Settlement Ratio ◽  
Pile Length

The effects of pile diameter, the property of pile end bearing stratum, the material parameters of pile shaft and the changes of pile length on the bearing performance of extra-long and large-diameter single pile were examined with the finite element software ABAQUS to make the numerical simulation analysis, by establishing the overall axial symmetry model, which was based on the data of static load test of single pile at the Yellow River Bridge site. The results show that the ultimate bearing capacity of single pile, the stiffness and the end resistance ratio would increase gradually, whereas the compression settlement ratio decreases slowly; the pile end grouting can significantly increase the ultimate loads, and therefore, improve the bearing performance of piles, but it has little effect on the stiffness of pile when loading was smaller; the elastic modulus of pile shaft has no effect on the ultimate bearing capacity of friction piles, little on the end resistance ratio, while the pile compression settlement ratio would gradually decrease and the stiffness would increased with the increase of the elastic modulus of pile shaft, and this increase of stiffness would slow down with the increase of elastic modulus of pile shaft; it is unreasonable to improve the ultimate bearing capacity of extra-long single pile only by means of increasing the pile length.

Construction Numerical Simulation of Cable-Supported Barrel Shell Structure Considering Construction Nonlinearity

2014 ◽  
Vol 548-549 ◽  
pp. 1748-1752
Author(s):  
Jia Li ◽  
Jing Hai Yu ◽  
Xiang Yu Yan ◽  
Hong Bo Liu
Keyword(s):  
Numerical Simulation ◽  
Shell Structure ◽  
Simulation Analysis ◽  
Mutual Influence ◽  
Reference Value ◽  
Construction Process ◽  
Analysis Method ◽  
Nonlinear Simulation ◽  
Similar Construction ◽  
Structure Layout

Based on an actual construction process, this paper put forward a nonlinear simulation analysis method, which can take the mutual influence between structural forming and the tensioning of the active-cables into account. The proposed method shows good performance in solving the problem of structure layout finding and the pre-stress calculation of pre-tensioning tendons by stages and in group. The method has clear mechanical conception and is of reference value for similar construction analysis.

Numerical Simulation Analysis of Soil Nailing Wall Based on FLAC during the Excavation of the Foundation Pit

2012 ◽  
Vol 594-597 ◽  
pp. 2906-2914
Author(s):  
Chang Wen Chen
Keyword(s):  
Numerical Simulation ◽  
Test Data ◽  
Simulation Analysis ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Soil Nailing ◽  
Construction Process ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Supporting Structure

On the basis of a typical engineering, a foundation of soil nailing walls supporting simulation model of soil nailing on the structure of the excavation is established with FLAC, the construction process of the supporting structure is analyzed in the dynamic simulation. The deformation characteristics of the supporting structure are analyzed during the construction process, the law of the supporting body deformation with the difference of excavation steps is summarized. The situ test data of the deep foundation horizontal displacement and vertical displacement are obtained by testing in situ. Some useful conclusions are summarized by comparative analyzing the numerical simulation value and situ test data, providing guidance for the design and construction of the pit soil nailing wall.

The Numerical Simulation Analysis of Excavation Process of Loess Tunnel

2011 ◽  
Vol 383-390 ◽  
pp. 6594-6600 ◽  
Author(s):  
Jian Guo ◽  
Qi Cai Wang
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Internal Force ◽  
Design Parameters ◽  
Construction Process ◽  
The Finite Element Method ◽  
Excavation Process ◽  
Internal Forces ◽  
The Stability ◽  
Method Construction

The bench method dynamic construction process of Xin Baotashan tunnel which located in the grade IV surrounding rock is simulated by using the finite element method. The variation of displacement and stress field of the surrounding rocks and the internal force of the lining structures during every excavation step is calculated. The state of the surrounding rocks can be predicted by the numerical simulation results, and the construction plan and construction sequences can be guided by the analysis results. At the same time the reasonability and feasibility of the design parameters can be judged by analyzing the internal forces of the lining structures. Analysis and experimental results showed that the stability of the surrounding rocks is good by using the bench method construction to the IV grade surrounding rocks and the design parameters of the lining structures are feasible.

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