Analysis and Controlling of the Surrounding Rock Stability Mechanism in Underground Engineering

2012 ◽  
Vol 170-173 ◽  
pp. 29-32
Author(s):  
Xian Kai Bao ◽  
Guo Qiang Li
Keyword(s):  
Surrounding Rock ◽  
Control Methods ◽  
Underground Engineering ◽  
Rock Stability ◽  
Instability Modes ◽  
Engineering Practices

This thesis introduces various factors of surrounding rock stability mechanism and instability modes, indicates its control methods and thought. The achievements apply well in engineering practices and have good values and researches on surrounding rock stability have instructive significance in engineering execution.

Application of Catastrophe Theory in Surrounding Rock Stability

2013 ◽  
Vol 712-715 ◽  
pp. 974-978
Author(s):  
Din Ge Kong ◽  
Kai Hu
Keyword(s):  
Catastrophe Theory ◽  
Surrounding Rock ◽  
Underground Engineering ◽  
Rock System ◽  
Instability Problem ◽  
Rock Stability ◽  
Highly Nonlinear ◽  
Practical Engineering ◽  
Simplified Mechanical Model ◽  
Catastrophic Model

Surrounding rock system of underground engineering is highly nonlinear, and there is no unified cognition for its stability criteria. Introduces the basic principle of catastrophe theory, focusing on the cusp catastrophic model, build a simplified mechanical model for the surrounding rock, and the instability of surrounding rock of the cusp catastrophic model is obtained. In practical engineering, it is show that catastrophe theory is an effective method to study the instability problem of the tunnel.

Study & Design on Hanging Assembly Supporting Structure in the Underground Roadway

2012 ◽  
Vol 256-259 ◽  
pp. 1312-1315
Author(s):  
Hong Li Wang ◽  
Xian Tang Zhang ◽  
Wei Bao ◽  
Hu Xiu
Keyword(s):  
Failure Mechanism ◽  
Study Design ◽  
Surrounding Rock ◽  
Underground Engineering ◽  
Underground Tunnel ◽  
Supporting Structure ◽  
Rock Stability ◽  
Underground Roadway ◽  
Roadway Support

Based on a large number of surrounding rock stability, it sums up the classification of surrounding rock, nature and failure mechanism in the underground engineering. This paper introduces a underground tunnel hanging assembly support, the supporting structure can effectively solve the problem of insufficient rigidity of the roadway support, and provide a supporting structure with a certain amount of shrinkage.

Application Research of Rock Coupling Testing System for Underground Engineering in Sanshandao Gold Mine

2013 ◽  
Vol 405-408 ◽  
pp. 1360-1366
Author(s):  
Dong Ji ◽  
Chao Peng ◽  
Liang Zhao ◽  
Fen Hua Ren
Keyword(s):  
Field Testing ◽  
Evaluation Study ◽  
Surrounding Rock ◽  
Testing System ◽  
Gold Mine ◽  
Underground Engineering ◽  
Rock Stability ◽  
Deformation Law ◽  
Current Impact

Rock instability and failure disasters are now common engineering-geological problems of underground engineering. The evaluation of stability of surrounding rock is a complicated uncertainty system problem, which needs various different research means. Rock coupling testing system composed of loose circle testing section, convergence monitoring section and multipoint displacement monitoring section is arranged at-600m level of Sanshandao gold mine; deformation law of roadway surrounding rock is well studied through long-term field testing and monitoring work. Achieved application results reveal overall stability of rock mass in gold mine deep area is relatively good, current impact caused by roadway excavation is not obvious. Coupling testing system is engineering practicable, which can meet the demand of rock stability evaluation study of underground engineering in Sanshandao gold mine.

Analysis of Influence Factors of Tunnel Surrounding Rock Stability and Researches of its Control Methods

2013 ◽  
Vol 438-439 ◽  
pp. 979-982
Author(s):  
Xian Kai Bao
Keyword(s):  
Influence Factors ◽  
Surrounding Rock ◽  
Control Methods ◽  
Engineering Construction ◽  
Entire Process ◽  
Rock Stability ◽  
Stability Of Surrounding Rock ◽  
Relationship Of ◽  
The Relationship ◽  
Non Destructive

This paper analyzes various factors about the surrounding rock stability in tunnel, on this basis, proposes control methods and ideas about the surrounding rock stability in tunnel, and discusses in detail the relationship of bolt working load and the surrounding rock stability. Using the approach of non-destructive monitoring bolts can be well monitor the surrounding rock stability of entire process. The result will provide great reference for research studies on stability of surrounding rock and the engineering construction.

The Evaluation of Surrounding Rock Stability around Underground Engineerings Based on Improved Extension Evaluation Method

2012 ◽  
Vol 594-597 ◽  
pp. 339-342
Author(s):  
Suo Juan Zhang ◽  
Guo Qing Qiu ◽  
Wen Bin Xie ◽  
Xiu Li Qi ◽  
Zhi Guang Ao ◽  
...  
Keyword(s):  
Correlation Function ◽  
Evaluation Method ◽  
Surrounding Rock ◽  
Extension Theory ◽  
Stability Evaluation ◽  
Underground Engineering ◽  
Extension Method ◽  
Rock Stability ◽  
The Stability ◽  
Extension Evaluation

Combined with the research of the stability grade of surrounding rock, this paper put forward into the extension method on surrounding rock stability around underground engineerings with extension theory. The extension method was improved the value of the limited field, the correlation function and weights coefficients to establish the stability evaluation method. The method was successfully applied into the underground engineering case, which has provided scientific reference for design and construction of underground engineerings.

scholarly journals Study on instability failure mode and monitoring early warning standard of surrounding rock in fully weathered argillaceous sandstone section of large section tunnel

2019 ◽  
Vol 136 ◽  
pp. 04023
Author(s):  
Ming Zhao ◽  
Ke Li ◽  
Hong Yan Guo ◽  
KaiCheng Hua
Keyword(s):  
Limit State ◽  
Stable State ◽  
Simulation Software ◽  
Surrounding Rock ◽  
Large Section ◽  
Rock Stability ◽  
Geological Conditions ◽  
Construction Step ◽  
The Face ◽  
The Stability

Based on the special geological conditions of a tunnel in Qingyuan section of Huizhou-Zhanzhou Expressway, FLAC3d numerical simulation software is used to simulate the rheological properties and instability of surrounding rock in large-section fully weathered sandstone section, and the stability and loss of surrounding rock are analyzed. The deformation of the dome and the face at steady state is analyzed. It is found that: 1) when the surrounding rock is in a stable state, the deformation curve of the dome is smooth. When the surrounding rock of the face is unstable, the front of the face appears ahead. Deformation should be first strengthened on the surrounding rock in front of the face. 2) The arched foot is an important part of the instability of the surrounding rock. In order to prevent the expansion of the collapsed part, the arched part should be reinforced. 3) In order to obtain the limit state of surrounding rock stability, the strength of surrounding rock is reduced, and the strength reduction coefficient corresponding to the displacement sudden point is taken as the safety factor of rock stability around the hole, and the stability safety coefficients of surrounding rock of each construction step are greater than 1.2. 4) The dynamic standard values of deformation control in the whole construction stage are obtained by analyzing the deformation curves of each data monitoring point with time in the corresponding time period of each construction step.

Numerical Simulation of Blasting-Induced Damage in Grouting Curtain of Sandstone Aquifer for Vertical Shaft

2015 ◽  
Vol 723 ◽  
pp. 271-278
Author(s):  
Yu Liang Zhou ◽  
Dong Feng Yuan ◽  
Jun Zheng ◽  
Hua Wang
Keyword(s):  
Numerical Simulation ◽  
Prevention And Control ◽  
Damage Zone ◽  
Surrounding Rock ◽  
Damage Effect ◽  
Vertical Shaft ◽  
Control Methods ◽  
Sandstone Aquifer ◽  
And Control ◽  
Dynamic Damage

To provide a theoretical basis for water prevention and control methods and reasonable supporting techniques for vertical shaft, and to ensure the shaft construction to pass the sandstone aquifer safely and rapidly, numerical simulation using dynamic damage constitutive model, which was a user-defined constitutive modules in FLAC3D, a lagrangian analysis code in three dimensions, has been applied to investigate the dynamic damage effect in the surrounding rock of the grouting curtain near the driving working face for vertical shaft excavated by blasting. The results indicate that the distribution of the damage zone in the surrounding rock of the shaft, which decreases the effective thickness of the grouting curtain, was like a ellip-se, and that the depth of the damage zone in the surrounding rock of the shaft grouting curtain is fewer than that of the driving face floor. It can be concluded that the centre part of the driving face floor, especially the cutting hole zones, and the shaft wall in the greater horizontal stress side are the " key parts " for shaft water prevention and control methods.

Application of ABAQUS in Surrounding Rock Stability Analysis of Shallow Large Cross-Section Tunnel

2015 ◽  
Vol 777 ◽  
pp. 8-12 ◽  
Author(s):  
Lin Zhen Cai ◽  
Cheng Liang Zhang
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Strong Support ◽  
Surrounding Rock ◽  
Tunnel Engineering ◽  
Tunnel Excavation ◽  
Rock Stability ◽  
Rock Bolting ◽  
Excavation Support ◽  
The Stability

HuJiaDi tunnel construction of Dai Gong highway is troublesome, the surrounding-rock mass give priority to full to strong weathering basalt, surrounding rock integrity is poor, weak self-stability of surrounding rock, and tunnel is prone to collapse. In order to reduce disturbance, taking advantage of the ability of rock mass, excavation adopt the method of "more steps, short footage and strong support". The excavation method using three steps excavation, The excavation footage is about 1.2 ~ 1.5 m; The surrounding rock bolting system still produce a large deformation after completion of the first support construction, it shows that the adopted support intensity cannot guarantee the stability of the tunnel engineering. Using ABAQUS to simulate tunnel excavation support, optimizing the support parameters of the tunnel, conducting comparative analysis with Monitoring and Measuring and numerical simulation results, it shows that the displacement - time curves have a certain consistency in numerical simulation of ABAQUS and Monitoring and Measuring.

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