Influence of dynamic pressure on deep underground soft rock roadway support and its application

2016 ◽  
Vol 26 (5) ◽  
pp. 903-912 ◽  
Author(s):  
Qingbin Meng ◽  
Lijun Han ◽  
Yanlong Chen ◽  
Jiadong Fan ◽  
Shengyong Wen ◽  
...  
Keyword(s):  
Dynamic Pressure ◽  
Soft Rock ◽  
Deep Underground ◽  
Roadway Support ◽  
Soft Rock Roadway ◽  
Rock Roadway

scholarly journals Study of Soft Rock Roadway Support Technique

2011 ◽  
Vol 26 ◽  
pp. 321-326 ◽  
Author(s):  
Haifeng Lin
Keyword(s):  
Soft Rock ◽  
Roadway Support ◽  
Soft Rock Roadway ◽  
Rock Roadway

An Experimental Study of Soft Rock Roadway with Anchored Support Structure Based on Nested Mechanical Analysis Model

2011 ◽  
Vol 90-93 ◽  
pp. 277-283
Author(s):  
Fu Sheng Liu ◽  
Gang Gang Dong ◽  
Su Hua Wang ◽  
Shao Jie Wang ◽  
Yang Song
Keyword(s):  
Design Method ◽  
Dynamic Pressure ◽  
Three Dimensional ◽  
Soft Rock ◽  
Mechanical Analysis ◽  
Analysis Model ◽  
Support Structure ◽  
Three Dimensional Finite Element ◽  
Soft Rock Roadway ◽  
Rock Roadway

This paper chooses anchored support engineering of ore dynamic pressure soft rock roadway Qinan, Huaibei city as an example, and with the help of nested mechanical analysis model of anchored support structure, the paper analyzes the range of elastoplasticity, the range of anchor note area, stress and displacement of original rocks of the reinforced project, and simulates three-dimensional finite element numerical and underwent engineering detection of the project. Practicality and validity of quantitative control design method of anchored support structure are proved by comparing the theoretic research, calculation results, and field measurement results.

scholarly journals Study on Surrounding Rock-Bearing Structure and Associated Control Mechanism of Deep Soft Rock Roadway Under Dynamic Pressure

2019 ◽  
Vol 11 (7) ◽  
pp. 1892 ◽  
Author(s):  
Dongdong Qin ◽  
Xufeng Wang ◽  
Dongsheng Zhang ◽  
Xuyang Chen
Keyword(s):  
Dynamic Pressure ◽  
Soft Rock ◽  
Friction Angle ◽  
Surrounding Rock ◽  
Control Effect ◽  
Pressure Relief ◽  
Reinforcement Scheme ◽  
Soft Rock Roadway ◽  
Bearing Structure ◽  
Rock Roadway

Providing support for deep soft rock roadways under dynamic pressure is a major technical challenge. In this study, the distribution characteristics of surrounding rock-bearing structure of such roadways were systematically examined using theoretical analysis and numerical simulation. Based on the control effect of different support methods on the surrounding rock-bearing structure; a reinforcement scheme for deep dynamic soft rock roadway was proposed and applied. The results indicate that: (1) by increasing the supporting strength of the internal bearing structure, cohesion, and internal friction angle of the surrounding rock, and by reducing the influence of mining, making the external bearing structure close to the roadway and reducing the thickness of the bearing structure, can improve the bearing capacity of the shallow surrounding rock in the roadway; (2) under the conditions of dynamic load and creep of the surrounding rock; the deformation of the rock increases significantly; external bearing structure is far away from the roadway, and thickness of the bearing structure increases; anchor cable support and floor pressure relief effect better control over the roof and the roadside deformation and floor heave, respectively; and the thickness of the corresponding external bearing structure is reduced by 30.84% and 41.50%, respectively; and (3) based on the application, the zonal reinforcement scheme of “fix cable to shed, floor pressure relief, deep-shallow composite grouting” is proposed and put into practice, with good results. The results of this study can provide theoretical support and reference for the determination of supporting parameters in deep roadways.

Numerical Simulation of Uniform Diffusion of Bolt Mesh Support to Wall Rock Stress

2012 ◽  
Vol 466-467 ◽  
pp. 508-512 ◽  
Author(s):  
Jia Yong Zhang ◽  
Xue Min Gong ◽  
Li Wen Guo
Keyword(s):  
Numerical Simulation ◽  
Theoretical Basis ◽  
Soft Rock ◽  
Wall Rock ◽  
Plastic State ◽  
Rock Stress ◽  
Bearing Strength ◽  
Roadway Support ◽  
Soft Rock Roadway ◽  
Rock Roadway

Soft rock roadway is one challenge of roadway support. With plastic state, it has a certain bearing strength, and its large plastic performance must release out in some form. Therefore soft rock roadway is not a single support effective, it must use a joint way. By numerical simulation, this paper analyzes uniform diffusion of bolt mesh support to wall rock stress, which provides a theoretical basis for bolt mesh support of soft rock.

scholarly journals A Case Study of Optimization and Application of Soft-Rock Roadway Support in Xiaokang Coal Mine, China

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Shuai Guo ◽  
Xun-Guo Zhu ◽  
Xun Liu ◽  
Hong-Fei Duan
Keyword(s):  
Soft Rock ◽  
Surrounding Rock ◽  
Geological Conditions ◽  
Floor Heave ◽  
Roadway Support ◽  
Soft Rock Roadway ◽  
Surrounding Rock Stress ◽  
Rock Roadway

The roadway of S2S2 fully mechanized caving face (FMCF) in Xiaokang Coal Mine is one of the most typical deep-buried soft-rock roadways in China and had been repaired several times. In order to figure out the failure reasons of the original roadway support, the geological conditions were investigated, the surrounding rock stress was monitored, the rib displacement, roof separation, and floor heave were in situ measured, and the performance of the U-shaped steel support was simulated. The above analysis results indicated that the support failure was mainly caused by (1) the unreasonable arch roadway section, (2) the high and complex surrounding rock stress, (3) the failure control of the floor heave, and (4) the inadequate self-supporting capacity of the surrounding rock. For optimizing, the roadway section was changed to circle and a new full-section combined support system of “belt-cable-mesh-shotcrete and U-shaped steel-filling behind the support” was adopted, which could specifically control the floor heave, allow the roadway deformation in control, and improve the self-supporting ability and stress field of the surrounding rock. To determine the support parameters, the selected U-shaped steel support was verified by simulation, and various bolt-cable support schemes were simulated and compared. Finally, such an optimized support scheme was applied in the roadway of the next replacement FMCF. The in situ monitoring showed that the rib-to-rib convergence and roof-to-floor convergence were both controlled within 600 mm, which indicated that the roadway was effectively controlled. This case study has important reference value and guiding function for the optimal design of the soft-rock roadway support with similar geological conditions.

scholarly journals Instability Mechanism and Key Control Technology of Deep Soft Rock Roadway under Long-Term Water Immersion

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Wei Jing ◽  
Xu Wang ◽  
Pengwei Hao ◽  
Laiwang Jing ◽  
Weipei Xue
Keyword(s):  
Water Immersion ◽  
Soft Rock ◽  
Surrounding Rock ◽  
The Self ◽  
Instability Mechanism ◽  
Roadway Support ◽  
Soft Rock Roadway ◽  
Bearing Structure ◽  
Rock Roadway

More and more attention has been paid to the supporting problem of deep soft rock roadway floor with long-term water immersion in recent years. However, the existing soft rock roadway support technology rarely takes into account the influence of the immersion softening phenomenon of the roadway floor and the self-supporting structure characteristics of the surrounding rock on the stability of the surrounding rock at the same time, and the influence of the creep characteristics of rock on the deformation zone of the surrounding rock requires further research on the nature and division of the self-supporting structure of the surrounding rock. In response to the issues mentioned, based on the loading and unloading properties of the surrounding rock of the soft rock roadway, a new concept of the internal and external self-bearing structure was proposed. The fact of water-immersed mudstone softening in the soft rock roadway floor was revealed through the field practice, and the shape of the internal and external bearing structure was determined based on the in situ monitoring results. Then, the instability mechanism of the internal and external self-bearing structure of the surrounding rock was analyzed, the position of the critical control point was calculated, and the key control technology based on the method of controlling floor heave by using double-row anchor cables to control the deformation of the roadway sides was put forward. Finally, the field industrial test showed that this support technology can effectively control the deformation and failure of soft rock roadway in the case of water immersion on the floor. This work can provide a technical reference for similar roadway support designs.

Research to Enhance the Supporting Stiffness of Different U-Type Sheds

2012 ◽  
Vol 256-259 ◽  
pp. 892-895
Author(s):  
Yu Cheng Zhao ◽  
Dan Feng Lu ◽  
Ya Bin Zhen
Keyword(s):  
Mechanical Properties ◽  
Soft Rock ◽  
Surrounding Rock ◽  
Stress Increase ◽  
Simulation And Optimization ◽  
Mining Depth ◽  
Angle Change ◽  
Roadway Support ◽  
Soft Rock Roadway ◽  
Rock Roadway

With the increase of the mining depth, the surrounding rock of roadways shows the characteristics of soft rock that the stress increase, poor rock cementation, broken loose, a significant expansion, creep deformation, etc. Deep roadways mainly use the combination of active and passive supporting method, U-type shed is widely used in the roadway support and becomes gradually the main supporting form. This paper studies mechanical properties of different arched U- type sheds, then compares the stress distribution and the displacement change. According to the result of simulation and optimization, it is seen that the deformation trend is regular with the angle change, and when θ=30°, the U- type shed is better in the roadway support. The conclusion can provide some theoretical guidance for the deep or soft rock roadway support.

scholarly journals Discussion on support technology of coal mine soft rock roadway

2020 ◽  
Vol 9 (1) ◽  
pp. 21-22
Author(s):  
Xiaolei Chen ◽  
Keyword(s):  
Coal Mine ◽  
Soft Rock ◽  
Geological Structure ◽  
Deep Mining ◽  
Coal Resources ◽  
Roadway Support ◽  
Increasing Demand ◽  
The Stability ◽  
Soft Rock Roadway ◽  
Rock Roadway

China is rich in coal resources. In most cases, coal resources are obtained through the way of mining. In the process of mining, it is necessary to control the application of mining technology, otherwise it will easily cause damage to the geological structure. With the increasing demand of social resources in recent years, shallow mining has been unable to meet the needs of the society, while deep mining is facing the problem of soft rock layer, which can not guarantee the stability and safety. Based on this, this paper will focus on the coal mine soft rock roadway support technology.

Research and Exploration on Combined Support Technology in Deep Soft-Rock Roadway

2012 ◽  
Vol 594-597 ◽  
pp. 616-620
Author(s):  
Lian Wei Ren ◽  
Guang Yong Wang ◽  
Long Wang
Keyword(s):  
Systems Engineering ◽  
High Stress ◽  
Soft Rock ◽  
Physical And Mechanical Properties ◽  
Surrounding Rock ◽  
Construction Technology ◽  
Geological Conditions ◽  
Roadway Support ◽  
Soft Rock Roadway ◽  
Rock Roadway

Because of the existence of high stress in the surrounding rock of deep roadway, the physical and mechanical properties of the surrounding rock to change, and the surrounding rock stress distribution is very different from the shallow, so the way of shallow roadway support is not suitable for deep roadway. Deep soft-rock roadway support is a complex systems engineering, it should consider the different geological conditions, roadway scope of application, construction technology conditions, construction period and the cost and other factors to determine the optimal combined support program, if the special geological conditions encountered in the construction, it should be timely to improve the supporting program to meet the construction safety and ensure the quality. This paper is based on the characteristics of deep roadway support, sums up the combined support form in the project, researches and analyzes the combined support technology, and explores how to use suitable combined support form in deep roadway.

Numerical Simulation Research on Deep Soft Rock Roadway

2012 ◽  
Vol 256-259 ◽  
pp. 1439-1442
Author(s):  
Bin Zhang ◽  
Xiang Lian Yu ◽  
Ning Liu ◽  
Feng Zhu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Soft Rock ◽  
Simulation Software ◽  
Simulation Research ◽  
Finite Element Software ◽  
Support Measure ◽  
Roadway Support ◽  
Soft Rock Roadway ◽  
Rock Roadway

The soft rock roadway support is one of difficult problems in the mineral engineering. For making the stress and strains of support system to be effective forecasted in the process of roadway support. The Adina finite element software is used to do numerical simulation about the strains of the supports system in the process of the Hama mountain roadway, and compare with the date which was got from the field monitoring. The date comparison shows that the results of simulation is basic anastomotic with the examination at present. So that it can be well predicted the effectiveness of the support measure when using the finite element simulation software –Adina.

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