The Construction Technology and Numerical Simulation on Tunnels Throughing Fault Fracture Zone with Rich Water

2012 ◽  
Vol 170-173 ◽  
pp. 3241-3244
Author(s):  
Bao Fu Duan ◽  
Ying Lei Zhu ◽  
Lei Li ◽  
Sheng Zhi Wu
Keyword(s):  
Numerical Simulation ◽  
Water Permeability ◽  
Fracture Zone ◽  
Water Resistance ◽  
Field Measurements ◽  
Construction Technology ◽  
Geological Conditions ◽  
Fault Fracture Zone ◽  
Construction Condition ◽  
Excavation Area

Fault fracture zone with rich water has some bad geological conditions such as low strength, deformation, strong water permeability, poor water resistance. Landslide has been happened because the water permeability. This paper is based on Yan-jia Tunnel in HuBei-Guzhu Highway. For the bad geological conditions, WSS is taken as the advanced support method to reinforce soil and stop watering. The method has improved the construction condition. To reduce the excavation area in one time and the disturbance to surrounding soil, the construction method of meshshotcreting firstly is adopted. The paper also do the numerical simulation with the numerical calculation tool of the software ABAQUS. The result is basically consistent with the field measurements, which has significance on the subsequent design and construction of underground projects with similar geological conditions

The Application of Tunnel Monitoring and Measurement in Yanjia Tunnel of Guzhu Expressway

2012 ◽  
Vol 588-589 ◽  
pp. 1019-1022
Author(s):  
Bao Fu Duan ◽  
Ying Lei Zhu ◽  
Xiang Pu Mao ◽  
Bo Liu
Keyword(s):  
Numerical Simulation ◽  
Water Permeability ◽  
Water Resistance ◽  
Field Measurements ◽  
Geological Conditions ◽  
Fault Fracture Zone ◽  
Advanced Support ◽  
Tunnel Monitoring ◽  
Monitoring And Measurement ◽  
Construction Condition

Fault fracture zone with rich water has some bad geological conditions such as low strength, deformation, strong water permeability, poor water resistance. This paper is based on Yan-jia Tunnel in HuBei-Guzhu Highway. WSS is taken as the advanced support method and has improved the construction condition. the construction method of meshshotcreting firstly is adopted. The result of numerical simulation with ABAQUS is basically consistent with the field measurements, which has significance on the subsequent design and construction of underground projects with similar geological conditions.

scholarly journals Tunnel Collapse Mechanism and Its Control Strategy in Fault Fracture Zone

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Jin Zhang ◽  
Mengxue Wang ◽  
Chuanhao Xi
Keyword(s):  
Large Deformation ◽  
Deformation Mechanism ◽  
Fracture Zone ◽  
Theoretical Research ◽  
Collapse Mechanism ◽  
Control Effect ◽  
Geological Conditions ◽  
Fault Fracture Zone ◽  
Reinforcement Measures ◽  
And Control

Complex geological conditions such as fault fracture zone will have a significant adverse impact on tunnel engineering, and collapse, large deformation, and other problems are prominent. The research on the large deformation mechanism and control of tunnel crossing fault fracture zone can provide guidance for tunnel safety construction. Based on the Jingzhai tunnel, combined with geological analysis, theoretical research, numerical simulation, and other means, this paper studies and analyzes the large deformation mechanism of the tunnel. The control effect of different advanced reinforcement measures is studied.

Research on the Mechnical Characteristics of Primary Supports in Guanjiao Tunnel Fault Fracture Zone and its Influence Zone by Field Tests

2011 ◽  
Vol 105-107 ◽  
pp. 1203-1210 ◽  
Author(s):  
Da Li ◽  
Zhan Fu Luo ◽  
Yong Sheng Li
Keyword(s):  
Fracture Zone ◽  
Field Tests ◽  
Surrounding Rock ◽  
Tunnel Construction ◽  
Railway Tunnel ◽  
Influence Zone ◽  
Geological Conditions ◽  
Fault Fracture Zone ◽  
Under Construction ◽  
Primary Support

The tunnel which excavated through the fault fracture zone is still one of the difficulties in the current tunnel construction. Guanjiao tunnel is the longest high-altitude tunnel in the world, and also the longest railway tunnel which is under construction in China. The 9# shaft which located in Erlang fault fracture zone with several faults, complicated geological conditions is difficult to excavate. In the representative section of F3 fault and its influence zone, F22 fault fracture zone, the monitoring tests on contact pressure between surrounding rock and primary support and stress of steel arch is conducted. According to the above monitoring results，the project recommendations are proposed to ensure the smooth construction of tunnel.

scholarly journals Failure Mechanism Analysis and Support Technology for Roadway Tunnel in Fault Fracture Zone: A Case Study

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3767
Author(s):  
Kai Wang ◽  
Lianguo Wang ◽  
Bo Ren
Keyword(s):  
Failure Mechanism ◽  
Fracture Zone ◽  
Fractured Rock ◽  
Stress Test ◽  
Deformation Monitoring ◽  
Mechanism Analysis ◽  
Support Design ◽  
Geological Conditions ◽  
Fault Fracture Zone

This paper introduces a case study on the failure mechanism and support design of a roadway tunnel in the fault fracture zone of the 106 mining area in the Yuandian no.2 coal mine. Based on the on-site geological conditions (in-situ stress test, borehole television imaging, and lithological analysis), the failure mechanism of the roadway tunnel in the fault fracture zone was studied. The test results showed that the high tectonic stress, fractured rock, and poor lithology are the primary reasons for the roadway instability. According to the support principles of grouting reinforcement, pre-reinforced support, and rational support range, a new type of combined support technology was proposed, including advanced grouting, grouting bolts, and grouting anchor cables. A 100 m roadway section was selected for field testing using the new support scheme, and detailed deformation monitoring was performed. Monitoring results showed that the roadway deformation under the new support was significantly reduced. During the roadway excavation process, no roof collapse phenomenon occurred, and the safety of roadway excavation was ensured. This successful case provides an important reference for similar roadway projects in the fault fracture zone.

Study on Parameters of Grouting Reinforced Circle for Water-Rich and Soft Fault Fracture Zone in Tunnel

2013 ◽  
Vol 470 ◽  
pp. 925-929 ◽  
Author(s):  
Zhi Peng Li ◽  
Shu Cai Li ◽  
Qing Song Zhang ◽  
Xiao Zhang ◽  
De Ming Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Fracture Zone ◽  
Water Inflow ◽  
Coupling Theory ◽  
Effective Management ◽  
Minimum Thickness ◽  
Soft Fault ◽  
Fault Fracture Zone ◽  
Curtain Grouting ◽  
Management Method

Water-rich and soft fault fracture zone is the geologic disaster source of water and mud outbursts in tunnel while the curtain grouting is an effective management method. To determine appropriate parameters of the grouting reinforced circle, depending on fluid-solid coupling theory and numerical simulation of the seepage fieldstress field, the influence of parameters to the water inflow and stability is analyzed while grouting effect was evaluated from the two aspects of reinforcement and water plugging. The conclusion show: the permeabilitystrength and thickness of the grouting reinforced circle are important factors of water inflow and surrounding stability while the choice of the thickness is inflected by the permeability and strength, when which reached a certain value the minimum thickness of the grouting reinforced circle is gotten.

Numerical Simulation Study on Three-Step Method Construction for Neighborhood Tunnel

2014 ◽  
Vol 580-583 ◽  
pp. 1327-1330
Author(s):  
Ling Ling Cai ◽  
Xiu Yuan Yang ◽  
Ning Guo
Keyword(s):  
Numerical Simulation ◽  
Mechanical Response ◽  
Simulation Software ◽  
Surrounding Rock ◽  
Construction Technology ◽  
Step Method ◽  
Creep Analysis ◽  
Geological Conditions ◽  
Difficult Terrain ◽  
The Cost

When crossing difficult terrain or extreme regional geological conditions encountered, there are difficulties in laying road routes, the spacing between two adjacent tunnels is limited. Neighborhood tunnel is a form of tunnel structure between separate and arch ones, less affected by the topography. It is more conveniently and easier to control the cost. Surrounding rock deformation mechanism with construction of three-step method is more complex, and therefore a reasonable means of construction technology and support is essential. Taking a certain neighborhood tunnel highway engineering background, aimed to provide guidance for follow-up monitoring and support, we use numerical simulation software FLAC3D on three-step method excavation construction. Rational creep analysis of geotechnical model and calculation parameters is selected. It helps to calculation and analysis the mechanical response of tunnel surrounding rock characteristics and clarify the tendency of displacement and stress fields.

scholarly journals Blowing and drifting snow in Alpine terrain: numerical simulation and related field measurements

1998 ◽  
Vol 26 ◽  
pp. 174-178 ◽  
Author(s):  
Peter Gauer
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Three Dimensional ◽  
Field Measurements ◽  
Blowing Snow ◽  
Related Field ◽  
Drifting Snow ◽  
Physically Based ◽  
Snow Transport

A physically based numerical model of drifting and blowing snow in three-dimensional terrain is developed. The model includes snow transport by saltation and suspension. As an example, a numerical simulation for an Alpine ridge is presented and compared with field measurements.

Evolution of delayed water inrush in fault fracture zone considering time effect

2021 ◽  
Vol 14 (11) ◽  
Author(s):  
Jiwen Bai ◽  
Shaolong Duan ◽  
Rentai Liu ◽  
Lin Xin ◽  
Jiawei Tian ◽  
...  
Keyword(s):  
Fracture Zone ◽  
Water Inrush ◽  
Time Effect ◽  
Fault Fracture Zone

scholarly journals An Approach to Determine Optimal Bow Configuration of Polar Ships under Combined Ice and Calm-Water Conditions

2021 ◽  
Vol 9 (6) ◽  
pp. 680
Author(s):  
Hui Li ◽  
Yan Feng ◽  
Muk Chen Ong ◽  
Xin Zhao ◽  
Li Zhou
Keyword(s):  
Numerical Simulation ◽  
Water Resistance ◽  
Numerical Technique ◽  
Experimental Studies ◽  
Resistance Index ◽  
Simulation Method ◽  
Present Approach ◽  
Calm Water ◽  
Level Ice ◽  
Ice Resistance

Selecting an optimal bow configuration is critical to the preliminary design of polar ships. This paper proposes an approach to determine the optimal bow of polar ships based on present numerical simulation and available published experimental studies. Unlike conventional methods, the present approach integrates both ice resistance and calm-water resistance with the navigating time. A numerical simulation method of an icebreaking vessel going straight ahead in level ice is developed using SPH (smoothed particle hydrodynamics) numerical technique of LS-DYNA. The present numerical results for the ice resistance in level ice are in satisfactory agreement with the available published experimental data. The bow configurations with superior icebreaking capability are obtained by analyzing the sensitivities due to the buttock angle γ, the frame angle β and the waterline angle α. The calm-water resistance is calculated using FVM (finite volume method). Finally, an overall resistance index devised from the ship resistance in ice/water weighted by their corresponding weighted navigation time is proposed. The present approach can be used for evaluating the integrated resistance performance of the polar ships operating in both a water route and ice route.

Reasonable Entry Layout of Lower Seam in Multi-Seam Mining Based on Numerical Simulation

2013 ◽  
Vol 295-298 ◽  
pp. 2980-2984
Author(s):  
Xiang Qian Wang ◽  
Da Fa Yin ◽  
Zhao Ning Gao ◽  
Qi Feng Zhao
Keyword(s):  
Numerical Simulation ◽  
Stress Distribution ◽  
Coal Seam ◽  
Coal Mine ◽  
Abutment Pressure ◽  
Surrounding Rock ◽  
Geological Conditions ◽  
Seam Mining

Based on the geological conditions of 6# coal seam and 8# coal seam in Xieqiao Coal Mine, to determine reasonable entry layout of lower seam in multi-seam mining, alternate internal entry layout, alternate exterior entry layout and overlapping entry layout were put forward and simulated by FLAC3D. Then stress distribution and displacement characteristics of surrounding rock were analyzed in the three ways of entry layout, leading to the conclusion that alternate internal entry layout is a better choice for multi-seam mining, for which makes the entry located in stress reduce zone and reduces the influence of abutment pressure of upper coal seam mining to a certain extent,. And the mining practice of Xieqiao Coal Mine tested the results, which will offer a beneficial reference for entry layout with similar geological conditions in multi-seam mining.

Sign in / Sign up

Export Citation Format

Share Document