Coal Mine Roadway Stability in Soft Rock: A Case Study

2013 ◽  
Vol 47 (6) ◽  
pp. 2225-2238 ◽  
Author(s):  
Baotang Shen
Keyword(s):  
Coal Mine ◽  
Soft Rock ◽  
Roadway Stability ◽  
Mine 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.

A case study on large deformation failure mechanism of deep soft rock roadway in Xin'An coal mine, China

2017 ◽  
Vol 217 ◽  
pp. 89-101 ◽  
Author(s):  
Sheng-Qi Yang ◽  
Miao Chen ◽  
Hong-Wen Jing ◽  
Kun-Fu Chen ◽  
Bo Meng
Keyword(s):  
Large Deformation ◽  
Failure Mechanism ◽  
Coal Mine ◽  
Soft Rock ◽  
Soft Rock Roadway ◽  
Rock Roadway

scholarly journals Width Design of Small Coal Pillar of Gob-Side Entry Driving in Soft Rock Working Face and Its Application of Zaoquan Coal Mine

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Ai Chen
Keyword(s):  
Coal Mine ◽  
Coal Pillar ◽  
Soft Rock ◽  
External Stress ◽  
Stress Fields ◽  
Working Face ◽  
Roadway Stability ◽  
Calculation Results ◽  
Stress Zone ◽  
Internal Stress Field

Reasonable width of gob-side coal pillar can reduce the waste of coal resources and is conducive to roadway stability. According to the distribution of internal and external stress fields at the working face, a method for determining the width of gob-side coal pillar was proposed. The coal pillar and roadway should be set within the internal stress field, and support is provided through the anchored part and the intact part of the coal pillar. The method was used in the design of the coal pillar at No. 130205 working face of Zaoquan Coal Mine. The calculation results indicated that the width of a coal pillar suitable for gob-side entry is 6.0 m. It is reasonable to arrange the roadway and coal pillar in the low-stress zone with a width of 11 m. During tunnelling of roadway and stoping of the working face, the deformation of the roadway increased with a reduction in the distance from the working face. Even during stoping of the working face, there was an approximately 1.5 m intact zone in the coal pillar. This indicates that the proposed method of designing small coal pillar of gob-side entry driving is reliable.

Sign in / Sign up

Export Citation Format

Share Document