Study on Failure Law of Deformation and Instability of Surrounding Rock in Deep Soft Rock Roadway

2021 ◽  
Author(s):  
Lei Shao ◽  
Heyong Yuan ◽  
Xinfeng Wang ◽  
Wengang Liu ◽  
Qiao Zhang
Keyword(s):  
Soft Rock ◽  
Surrounding Rock ◽  
Soft Rock Roadway ◽  
Rock Roadway

Strength Assessments of Concrete-Filled Steel Tubular Support of Soft Rock Roadway

2013 ◽  
Vol 838-841 ◽  
pp. 1884-1890 ◽  
Author(s):  
Guang Long Qu ◽  
Yan Fa Gao ◽  
Liu Yang ◽  
Bin Jing Xu ◽  
Guo Lei Liu ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Coal Mine ◽  
Soft Rock ◽  
Surrounding Rock ◽  
Flexural Performance ◽  
Laboratory Test Results ◽  
Different Types ◽  
Soft Rock Roadway ◽  
Core Concrete ◽  
Rock Roadway

Compared with I-shaped and U-shaped supports in soft rock roadway, concrete-filled steel tubular (CFST) support, as a new supporting form, has stronger bearing capacity with reasonable price. So it is becoming more and more popular in roadway supporting of coal mine in China. In this article, the surrounding rock in soft rock roadway was classified into three different types: hard rock in deep coal mine, soft surrounding rock, extremely soft surrounding rock. And, according to the characteristics of deformation failure of the CFST support and the surrounding rock in the industrial tests, three different strength assessments, including assessment of axial compressive strength, assessment of lateral flexural performance, assessment of hardening rate of core concrete, were proposed through mechanical analysis and laboratory tests for the three different types of the surrounding rock, respectively. Moreover, aimed to insufficient flexural strength of the support or low hardening rate of the core concrete in some of the roadway supporting, strengthening lateral flexural performance or making early strength concrete was necessary for the above unfavorable situations. The laboratory test results showed that the ultimate bearing capacity for the CFST support with φ194*8mm of steel tube reinforced by φ38mm round steel was 31% greater than that of the unreinforced one, 177% greater than that of the U-shaped one with equivalent weight per unit length.

Study on the Application of Bolt-Grout Reinforcement in the Deep Soft Rock Roadway

2011 ◽  
Vol 90-93 ◽  
pp. 1956-1959 ◽  
Author(s):  
Zhi Lin Dun ◽  
Da Shuai Ren ◽  
Lian Wei Ren
Keyword(s):  
Soft Rock ◽  
Field Monitoring ◽  
Surrounding Rock ◽  
Geological Condition ◽  
Mining Depth ◽  
Air Inlet ◽  
Strata Behavior ◽  
Soft Rock Roadway ◽  
Two Sides ◽  
Rock Roadway

With the increasement of mining depth, the strata behavior of the roadway is obvious. As the stress of surrounding rock increases, the bottom of the soft rock roadway becomes deformed easily compressed by its top rock and two sides rock, which leads to the occurrence of the pucking and roadway destruction. Aiming the air inlet roadway destruction phenomenon of -450th level powder magazine in Hebi Zhongtai Mining Co.Ltd, the geological condition and the mechanism of the roadway failure are analysed comprehensively, and the bolt-grout supporting method is also proposed in this paper. At last, the deformation and heaving floor are controlled effectively which is proved by the field monitoring results.

Numerical Simulation of Bolt-Mesh-Anchor Support Technology at Soft Rock Roadway

2013 ◽  
Vol 868 ◽  
pp. 251-254 ◽  
Author(s):  
Hui Yu ◽  
Ling Gen Kong ◽  
Zhi Yong Niu ◽  
Shi Ting Zhu ◽  
Dan Yang Jing
Keyword(s):  
Simulation Analysis ◽  
Soft Rock ◽  
Confining Pressure ◽  
Surrounding Rock ◽  
Numerical Software ◽  
The Stability ◽  
Roadway Deformation ◽  
Soft Rock Roadway ◽  
Surrounding Rock Stress ◽  
Rock Roadway

The roof of 12501 transportation roadway of Tunlan mine is friable. To solve the problem of large roadway deformation, the bolt-mesh-anchor support scheme is put forward. With the FLAC3D numerical software in the program, the simulation analysis shows that the program can effectively increase the roadway confining pressure to improve the state of the surrounding rock stress, reduce roadway displacement and deformation and thus keep the stability of the surrounding rock. The results show that Bolt and cable support can effectively control the surrounding rock, with the roadway convergence rate small, and the support system safe.

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.

Research on Supporting Theory of Pressure-Bearing Ring and Yield Supporting Technology in Extremely Soft Rock Roadway

2013 ◽  
Vol 395-396 ◽  
pp. 536-543 ◽  
Author(s):  
Guang Long Qu ◽  
Jun Wang ◽  
Guo Lei Liu
Keyword(s):  
Soft Rock ◽  
Steel Tube ◽  
Surrounding Rock ◽  
Concrete Lining ◽  
Mining District ◽  
Deep Mine ◽  
Bearing Ring ◽  
Soft Rock Roadway ◽  
Specific Project ◽  
Rock Roadway

The soft rock roadway is classified by uniaxial compressive strength of rock and water-physical properties, which includes hard surrounding rock in deep mine, soft surrounding rock, and extremely soft surrounding rock. Aimed to the situation of being hard to support the extremely soft rock roadway, with combination of the specific project of return airway crossheading roadway of sea area NO.2 mining district in Beizao coal mine, a compound roadway supporting technology based on the concrete-filled steel tube support, reinforced concrete lining, with combination of yield supporting technology was used for this specific project, for which the mechanical model of the pressure-bearing ring structure was analyzed and calculated by using fixed-end arch theory in structural mechanics and Lame formula in Elastic theory. The field test results showed that this new compound roadway supporting technology was an ideal method to support the extremely soft rock roadway, which could control the deformation of roadway and realize the stability of roadway, effectively.

Deformation characteristics of surrounding rock of broken and soft rock roadway

2009 ◽  
Vol 19 (2) ◽  
pp. 205-209 ◽  
Author(s):  
Jin-xi WANG ◽  
Ming-yue LIN ◽  
Duan-xin TIAN ◽  
Cun-liang ZHAO
Keyword(s):  
Soft Rock ◽  
Surrounding Rock ◽  
Deformation Characteristics ◽  
Soft Rock Roadway ◽  
Rock Roadway

scholarly journals Failure Mechanism Analysis and Support Design for Deep Composite Soft Rock Roadway: A Case Study of the Yangcheng Coal Mine in China

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Bangyou Jiang ◽  
Lianguo Wang ◽  
Yinlong Lu ◽  
Shitan Gu ◽  
Xiaokang Sun
Keyword(s):  
Failure Mechanism ◽  
Coal Mine ◽  
Failure Mechanisms ◽  
Soft Rock ◽  
Deformation Monitoring ◽  
Surrounding Rock ◽  
Support Design ◽  
Soft Rock Roadway ◽  
Rock Roadway

This paper presented a case study of the failure mechanisms and support design for deep composite soft rock roadway in the Yangcheng Coal Mine of China. Many experiments and field tests were performed to reveal the failure mechanisms of the roadway. It was found that the surrounding rock of the roadway was HJS complex soft rock that was characterized by poor rock quality, widespread development of joint fissures, and an unstable creep property. The major horizontal stress, which was almost perpendicular to the roadway, was 1.59 times larger than the vertical stress. The weak surrounding rock and high tectonic stress were the main internal causes of roadway instabilities, and the inadequate support was the external cause. Based on the failure mechanism, a new support design was proposed that consisted of bolting, cable, metal mesh, shotcrete, and grouting. A field experiment using the new design was performed in a roadway section approximately 100 m long. Detailed deformation monitoring was conducted in the experimental roadway sections and sections of the previous roadway. The monitoring results showed that deformations of the roadway with the new support design were reduced by 85–90% compared with those of the old design. This successful case provides an important reference for similar soft rock roadway projects.

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