Mechanical mechanism and support design analysis on bolt-beam-net support in soft rock roadway in Qigou Coal Mine

2012 ◽  
Vol 18 (3) ◽  
pp. 247-253 ◽  
Author(s):  
Tao Li ◽  
Ren-liang Shan ◽  
Huan-shang Han ◽  
Wei-hong Yang ◽  
Nian Liu
Keyword(s):  
Coal Mine ◽  
Soft Rock ◽  
Design Analysis ◽  
Support Design ◽  
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.

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 Stability for Intersection of Deep Soft Rock Roadway

2011 ◽  
Vol 243-249 ◽  
pp. 2666-2669
Author(s):  
Zhan Jin Li ◽  
Yang Zhang ◽  
Xue Li Zhao
Keyword(s):  
Coal Mine ◽  
Soft Rock ◽  
Intersection Problem ◽  
The Third ◽  
Geological Conditions ◽  
Control Stability ◽  
Soft Rock Roadway ◽  
Crossing Point ◽  
Coupling Support ◽  
Rock Roadway

With the depth increasing continuously, more complicated of geological conditions, will make intersection in deep soft rock roadway is very difficult to support. In order to solve the intersection problem of difficult to support, combined with the third levels of the Fifth Coal Mine of Hemei, the coupling supporting design—anchor-mesh-cable + truss to control stability of crossing point—is proposed. Based software of FLAC3D, simulate the program applicable in deep soft rock roadway intersection. Application results show that the coupling support technology of anchor-mesh-cable + truss can effectively control the deformation of intersection in deep soft rock roadway.

scholarly journals A Study of Soft Rock Roadway Coupling Support in Xiajing Coal Mine

2014 ◽  
Vol 84 ◽  
pp. 812-817
Author(s):  
Li Xuefeng ◽  
Cheng Guihai ◽  
Li Xiaoquan ◽  
Zhang Ruichong
Keyword(s):  
Coal Mine ◽  
Soft Rock ◽  
Soft Rock Roadway ◽  
Coupling Support ◽  
Rock Roadway

scholarly journals Comparative study on bearing mechanism and design parameters of confined concrete arch joints in deep soft rock roadway

2019 ◽  
Vol 6 (4) ◽  
pp. 493-504
Author(s):  
Wei Lu ◽  
Qi Wang ◽  
Bei Jiang ◽  
Shuo Xu ◽  
Bohong Liu ◽  
...  
Keyword(s):  
Failure Modes ◽  
Soft Rock ◽  
Bending Moment ◽  
High Strength ◽  
Internal Force ◽  
Confined Concrete ◽  
Design Parameters ◽  
Support Design ◽  
Soft Rock Roadway ◽  
Rock Roadway

Abstract Square confined concrete arch is increasingly used in deep soft rock roadway support because of its advantages of high strength and construction convenience. However, the design of confined concrete arch in underground engineering still remains in experience-based method and lacks quantitative analysis. As a connecting component between arch sections, the connection joints have an important influence on the internal force distribution and failure mechanism of support arch. Therefore, a reasonable design of arch joints is the premise of rational support design. Taking Liangjia Coal Mine, a typical deep soft rock mine in China, as research background, this paper fully compared the most widely used joint types of confined concrete arch as analytical objects: flange joints and casing joints. The main failure modes of these two kinds of joints under bending moment are defined. Laboratory and numerical tests are carried out to study the mechanical characteristics of joints. Based on the M–θ curve, the influence law of different design parameters is analyzed, and the design principles of joints are proposed. The research results could provide a theoretical basis for the design and application of confined concrete arch in related projects.

Analysis on Deformation and Support Technology of Deep Soft Rock Roadway

2014 ◽  
Vol 580-583 ◽  
pp. 556-559
Author(s):  
Yong Sheng Liu ◽  
Wang Liu ◽  
Xing Yu Dong
Keyword(s):  
Coal Mine ◽  
Soft Rock ◽  
Reference Value ◽  
Roadway Deformation ◽  
Soft Rock Roadway ◽  
Rock Roadway

The deformation and support technology of soft roadway is a very important problem in mine. Based on the roadway’s deformation of Jian Xin Mine of Jiangxi Fengcheng Mining Bureau, the mechanics mechanism and reasons of the soft rock roadway deformation are analyzed. And the three kinds of support technologies which are suitable for soft rock roadway are put forward. The support technologies have been used in the soft rock roadway of coal mine and have achieved good results. The research has important reference value for soft rock roadway supporting technology and its stability maintenance.

The Study on the Support Technology of the Soft Rock Roadway for Coal Mining under Sea

2012 ◽  
Vol 256-259 ◽  
pp. 1919-1922
Author(s):  
Xiang Gang Wang ◽  
Kang Yuan ◽  
Xun Zhen Wu ◽  
Wei Shen Zhu
Keyword(s):  
Finite Difference ◽  
Principal Stress ◽  
Coal Mining ◽  
Coal Mine ◽  
Soft Rock ◽  
Numerical Results ◽  
The Stability ◽  
Soft Rock Roadway ◽  
Rock Roadway

Based on the engineering background of -350m level roadway in Beizao Coal Mine ,three schemes about the excavation and support of the roadway were simulated via the coupled fluid-solid theorem in the the finite difference software FLAC3D. The stability of the soft rock roadway and the effect of bolt-grouting support were analysed according to the obtained numerical results of displacement,principal stress and plastic zone.It is concluded that the seepage has an influence on the stability of the soft rock roadway,besides,it is proved that the bolt-grouting support is rational and effective in the design of support concerning the soft rock roadway.The study has important guiding significance to other similar engineering.

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