scholarly journals Deformation Mechanism and Surrounding Rock Control in High-Stress Soft Rock Roadway: A Case Study

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Yuwen Gao ◽  
Chen Wang ◽  
Yong Liu ◽  
Yuyang Wang ◽  
Lianchang Han
Keyword(s):  
Theoretical Analysis ◽  
High Stress ◽  
Soft Rock ◽  
Stability Control ◽  
Steel Tube ◽  
Field Application ◽  
Industrial Test ◽  
Surrounding Rock ◽  
Guizhou Province ◽  
Deformation And Failure

Stability control for soft and broken surrounding rock of roadways is one important segment of mining support. Taking 1412 Roadway of a mine in Guizhou province as a research background, this paper studies the large deformation of surrounding rock and the failure of bolts and cables. The deformation and failure mechanism are analyzed by related theoretical analysis and field survey. Then, the feasibility of the composite controlling scheme, bolts and cables + grouting + steel tube concrete support, is verified by theoretical analysis, numerical simulation, and industrial test. Following results can be obtained: main reasons leading to the deformation of surrounding rock and the failure of cables and blots in the roadway are low strength and poor self-stability of surrounding rock, complex stress environment, low support resistance, and lack of reinforced support in crucial supporting sites; the control scheme can reduce the surrounding rock deformation by 40%, which meets the requirements of field application so that this practice can provide some guidance for other similar projects.

scholarly journals Experimental Test on Nonuniform Deformation in the Tilted Strata of a Deep Coal Mine

2021 ◽  
Vol 13 (23) ◽  
pp. 13280
Author(s):  
Hai Wu ◽  
Qian Jia ◽  
Weijun Wang ◽  
Nong Zhong ◽  
Yiming Zhao
Keyword(s):  
High Stress ◽  
Stability Control ◽  
Surrounding Rock ◽  
Experimental Results ◽  
Lower Side ◽  
Reinforcement Scheme ◽  
Deformation And Failure ◽  
True Triaxial ◽  
Deep Mine ◽  
Deep Coal Mine

Taking a deep-mine horizontal roadway in inclined strata as our research object, the true triaxial simulation technique was used to establish a model of the inclined strata and carry out high-stress triaxial loading experiments. The experimental results show that the deformation of surrounding rock in the roadway presents heterogeneous deformation characteristics in time and space: the deformation of the surrounding rock at different positions of the roadway occurs at different times. In the process of deformation of the surrounding rock, deformation and failure occur at the floor of the roadway first, followed by the lower shoulder-angle of the roadway, and finally the rest of the roadway. The deformation amount in the various areas is different. The floor heave deformation of the roadway floor is the greatest and shows obvious left-right asymmetry. The deformation of the higher side is greater than that of the lower side. The model disassembly shows that the development of cracks in the surrounding rock is characterized by more cracks on the higher side and fewer cracks on the lower side but shows larger cracks across the width. The experimental results of high-stress deformation of the surrounding rock are helpful in the design of supports, the reinforcement scheme, and the parameter optimization of roadways in high-stress-inclined rock, and to improve the stability control of deep high-stress roadways.

Investigation on Deformation and Failure Characteristics and Stability Control of Soft Rock Roadway Surrounding Rock in Deep Coal Mine

2011 ◽  
Vol 255-260 ◽  
pp. 3711-3716 ◽  
Author(s):  
Ju Cai Chang ◽  
Guang Xiang Xie
Keyword(s):  
Coal Mine ◽  
Plastic Region ◽  
Soft Rock ◽  
Stability Control ◽  
Surrounding Rock ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
Deep Coal Mine ◽  
Soft Rock Roadway ◽  
Rock Roadway

Numerical simulation and field measurement were carried out to investigate into laws of deformation and movement and the evolving characteristics of the plastic region around the roadway based on engineering conditions of deep soft rock roadway in Wangfenggang colliery, Huainan Mining area. The mechanism of controlling the surrounding rock stability of soft rock roadway in deep coal mine was demonstrated. The supporting of soft rock roadway in deep coal mine must be compatible with deformation and failure characteristics of surrounding rock, and it can keep the stability of surrounding rock. The combined supporting with high strength and prestress bolting-anchoring and integral surrounding rock grouting reinforcement can effectively control the surrounding rock deformation of soft rock roadway in deep coal mine. But every working step must be pay attention to sequence on the time and space so that it can play an integral supporting effect. Research results are put into practice accordingly and good control effect has been achieved.

Deformation Failure Analysis and Stability Control Technology of Large Section Soft Rock Chamber in Deep Coal Mine

2013 ◽  
Vol 353-356 ◽  
pp. 1035-1039
Author(s):  
Chang Hui An ◽  
Gui Bin Zhang ◽  
Zhi Da Liu ◽  
Kai Zhao ◽  
Wei Guo ◽  
...  
Keyword(s):  
Coal Mine ◽  
Soft Rock ◽  
Stability Control ◽  
Surrounding Rock ◽  
Mine Safety ◽  
Large Section ◽  
Deformation And Failure ◽  
Deep Coal Mine ◽  
Ground Pressure ◽  
The Impact

The chambers of certain coal mine in Shandong such as central substation situate in soft rock which consists of mudstone and fine sandstone, etc. Obvious ground pressure behaviors, large deformation and failure of surrounding rock have serious effect on mine safety production, with the impact of various complicated deep large ground pressure. This paper presents a rational scheme to control the surrounding rock steadily, based on analysis of deformation and failure on large section soft rock chamber, combined with the concept of the" combined supporting technology of long and short anchors" and "the combined supporting technology of three anchors".

The Principle and Method of the Backplane Anchor in Controlling the Overall Stability of the Surrounding Rock

2014 ◽  
Vol 1065-1069 ◽  
pp. 835-839
Author(s):  
Zhi Wei Li ◽  
Lai Wang Jing ◽  
Ren Shu Yang ◽  
Peng Wei Hao
Keyword(s):  
Stress State ◽  
High Stress ◽  
Soft Rock ◽  
Mining Area ◽  
State Theory ◽  
Industrial Test ◽  
Surrounding Rock ◽  
Overall Stability ◽  
Control Principle ◽  
Mine Hoist

The purpose of the article is to introduce a kind of control theory and technology of roadway floor heave and the surrounding rock of the upper part deformation in a high stress field. On the basis of the stress state theory in the modern mechanics, this paper which uses Yang Zhuang III1 mining area coal mine hoist room as the research and experimental object proposes a backplane anchor control principle and technology of the overall stability surrounding rock from the perspective of improving the stress state of surrounding rock particles. After the site industrial test,the technology has a very significant effect on the control of global stability of the surrounding rocks, large section, soft rock roadways and chambers.

scholarly journals Research on Supporting Method for High Stressed Soft Rock Roadway in Gentle Dipping Strata of Red Shale

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 423
Author(s):  
Chunde Ma ◽  
Jiaqing Xu ◽  
Guanshuang Tan ◽  
Weibin Xie ◽  
Zhihai Lv
Keyword(s):  
Failure Process ◽  
High Stress ◽  
Soft Rock ◽  
In Situ Stress ◽  
Mechanical Parameters ◽  
Deformation And Failure ◽  
Deep Mine ◽  
Plastic Energy ◽  
Roadway Stability ◽  
Phosphate Mine

Red shale is widely distributed among the deep mine areas of Kaiyang Phosphate Mine, which is the biggest underground phosphate mine of China. Because of the effect of various factors, such as high stress, ground water and so on, trackless transport roadways in deep mine areas were difficult to effectively support for a long time by using traditional supporting design methods. To deal with this problem, some innovative works were carried out in this paper. First, mineral composition and microstructure, anisotropic, hydraulic mechanical properties and other mechanical parameters of red shale were tested in a laboratory to reveal its deformation and failure characteristics from the aspect of lithology. Then, some numerical simulation about the failure process of the roadways in layered red shale strata was implemented to investigate the change regulation of stress and strain in the surrounding rock, according to the real rock mechanical parameters and in-situ stress data. Therefore, based on the composite failure law and existing support problems of red shale roadways, some effective methods and techniques were adopted, especially a kind of new wave-type bolt that was used to relieve rock expansion and plastic energy to prevent concentration of stress and excess deformation. The field experiment shows the superiorities in new techniques have been verified and successfully applied to safeguard roadway stability.

New Type of High-Strength Support in Deep Soft Rock Roadway

2013 ◽  
Vol 724-725 ◽  
pp. 1520-1525
Author(s):  
Ji Cheng Feng ◽  
Hong Jiao Li ◽  
Zhi Chao Zhao ◽  
Wen Long Zhang
Keyword(s):  
Comparative Analysis ◽  
Bending Strength ◽  
Soft Rock ◽  
High Strength ◽  
Field Application ◽  
Good Effect ◽  
Deformation And Failure ◽  
Pumping Station ◽  
Arch Support ◽  
Working Resistance

In order to control the deformation of large section surrounding rock in 700m level of the main drainage pumping station in the experimental mine, according to the reason for deformation and failure of the main drainage pumping station and material mechanics, fully-closed U-shaped support which used double welding I-steel bottom arch as the main structure was designed and the assembly and principles of support were described in detail, based on theoretical calculation and comparative analysis on the structure and mechanical properties of rectangular I-beam support, U-steel support, single I-beam arch support and double I-beam arch support. Based on the comparative analysis by numerical simulation, the rationality of the high strength support and the detailed support parameters were determined. It gets good effect in field application and ensures the long-term stability of the main drainage pumping station. The results show that: the double-layer I-beam 12# can increase bending strength by about 7.5 times. Double trough splint device used in shoulder of the support has the advantages of high strength, greater rigidity, good pliability and stable working resistance.

Three Dimensional Elastic-Plastic Numerical Simulation of Tunnel Excavation Sequence of Dalian Speed Railway

2012 ◽  
Vol 170-173 ◽  
pp. 1474-1478
Author(s):  
An Nan Jiang ◽  
Hong Wei Yang ◽  
Hong Fu Xin ◽  
Bing Bai
Keyword(s):  
Numerical Simulation ◽  
Damage Zone ◽  
Three Dimensional ◽  
Ground Surface ◽  
Soft Rock ◽  
Vertical Displacement ◽  
Stability Control ◽  
Surrounding Rock ◽  
Railway Tunnel ◽  
Elastic Plastic

Dalian speed railway tunnel is located in complex soft rock and soil, the road foundation deform and surrounding rock stability control is a concern problem. Along with the unloading process of excavation, surrounding rock moving to inner hole, while exceeding the elastic limitation, the plastic deform and the surrounding rock destroy then occurred. The paper adopted three dimensional elastic-plastic method based on Mohr-Coulomb yielding criterion and carried out numerical simulation of excavation process, in order to analyze and compare the surrounding rock vertical displacement contour, ground surface settlement and damage zone corresponding to different construction sequence. The elastic-plastic numerical method can reflect the damage and destroy character of nonlinear soil material of surrounding rock corresponding to different construction scheme, the simulation result has active guiding meaning for the Dalian speed railway tunnel construction design and dynamic analysis.

The Mechanical Mechanism of Hulking Force Stable Principle of Surrounding Rocks in Soft Rock Roadway

2014 ◽  
Vol 1065-1069 ◽  
pp. 830-834
Author(s):  
Wei Pei Xue ◽  
Lai Wang Jing
Keyword(s):  
Stress State ◽  
Ultimate Strength ◽  
Soft Rock ◽  
Reference Value ◽  
Industrial Test ◽  
Surrounding Rock ◽  
Support Mechanism ◽  
Rock Creep ◽  
Main Factors

This paper aims to reveal the important role of the hulking force in stabilizing the roadway. After introducing the three ultimate strength of the foundation rock upon, starting from the perspective of stress state, the article on the deformation area surrounding rock for a more reasonable division, and thus gives the main factors roadway deformation.Introduced in the basis of the three ultimate strength of the rock, from the perspective of stress state, deformation of roadway surrounding rock area to carry on the reasonable division, and then the main factors of roadway deformation is presented. Second, through the analysis of the formation of the hulking force, analysis of hulking force inhibition of surrounding rock creep mechanism of dynamic mechanics,and analysis of the hulking force to improve the effect of supporting mechanics mechanism. Describes the important role of the hulking force on the stability of surrounding rock. Finally, Huaibei Coal Mining Co., 8203 guobei roadway industrial test site, Demonstrates the effectiveness of the principle. Results of this study have important reference value to change the current research in deep coal mine deep soft rock and loose seam roadway support mechanism and technology.

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