scholarly journals Numerical investigation of failure evolution for the surrounding rock of a super‐large section chamber group in a deep coal mine

2019 ◽  
Vol 7 (6) ◽  
pp. 3124-3146 ◽  
Author(s):  
Yunliang Tan ◽  
Deyuan Fan ◽  
Xuesheng Liu ◽  
Shilin Song ◽  
Xianfeng Li ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Coal Mine ◽  
Surrounding Rock ◽  
Large Section ◽  
Deep Coal Mine ◽  
Failure Evolution

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".

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.

Study on the Technology Coefficient of Supporting for Deep Coal Mine Tunnels

2012 ◽  
Vol 170-173 ◽  
pp. 1392-1396
Author(s):  
Wei Zhang ◽  
Shi Hai Chen
Keyword(s):  
Coal Mine ◽  
Surrounding Rock ◽  
Maintenance Cost ◽  
Anchor Cable ◽  
Deep Coal Mine ◽  
Large Pressure ◽  
The Stability ◽  
And Control ◽  
Mine Tunnels ◽  
Coupling Support

To keep the stability of tunnel’s surrounding rock, and control the deformation of surrounding rocks and reduce the maintenance cost of tunnel in maximum, this article did the following aspects. Aiming at large pressure , large deformation , bad maintenance state in deep coal mine tunnel , joint cable anchor support technology is adopted , and the coordination deformation of tunnel is accomplished through anchor net-surrounding rock and its coupling with the anchor cable .Through the theoretical calculation and numerical simulation of cable anchor coupling support ,we determine reasonable technology coefficient of bolt supporting and verify the correctness of support coefficient by field observation.

A case study on control technology of surrounding rock of a large section chamber under a 1200-m deep goaf in Xingdong coal mine, China

2019 ◽  
Vol 104 ◽  
pp. 112-125 ◽  
Author(s):  
Shengrong Xie ◽  
Hao Pan ◽  
Junchao Zeng ◽  
En Wang ◽  
Dongdong Chen ◽  
...  
Keyword(s):  
Coal Mine ◽  
Surrounding Rock ◽  
Control Technology ◽  
Large Section

scholarly journals Dome Roof Fall Geohazards of Full-Seam Chamber with Ultra-Large Section in Coal Mine

2019 ◽  
Vol 9 (18) ◽  
pp. 3891 ◽  
Author(s):  
Rui Gao ◽  
Hongchun Xia ◽  
Kun Fang ◽  
Chunwang Zhang
Keyword(s):  
Shear Strength ◽  
Coal Mine ◽  
Shear Failure ◽  
High Strength ◽  
Surrounding Rock ◽  
Mine Pressure ◽  
Mechanical Equipment ◽  
Large Section ◽  
Crack Penetration ◽  
Roof Fall

The roof fall hazard is more likely to take place within chamber with ultra-large section, which would not only damage mechanical equipment, but also cause casualties. In this paper, the strap joint chamber of the Tashan coal mine is studied, and finite and discrete element method (FDEM) is used to establish the numerical model of the roof fall of the chamber dome. The simulation results show that the chamber dome mainly undergoes shear failure and forms a large number of cracks. With further development and penetration of cracks, a distinct roof separation is found in the chamber dome. When the crack develops to the dome surface of the chamber, under the effect of the mine pressure, the coal body is separated from the surface of the chamber and the roof fall hazard occurs. Based on the mechanism of roof fall hazard of the chamber dome, it is concluded that improving the shear strength of the surrounding rock and reducing the crack penetration are the main ways to control the roof fall. Therefore, the high-strength anchor bolt and cable support is adopted to fill the cracks and improve the shear strength of the surrounding rock. The result showed that the roof separation of the chamber dome in the field is confined to 0.012 m. The surrounding rock is well controlled and no roof fall occurs.

Numerical Simulation on Strengthening Supporting Mechanism and Effect of Anchor-Cables in Deep Coal Mine Roadway

2012 ◽  
Vol 170-173 ◽  
pp. 3512-3515
Author(s):  
Ju Cai Chang ◽  
Guang Xiang Xie
Keyword(s):  
Coal Mine ◽  
Surrounding Rock ◽  
Good Time ◽  
Lagrangian Analysis ◽  
Deformation And Failure ◽  
Deep Coal Mine ◽  
Geological Conditions ◽  
Stress States ◽  
The Stability ◽  
Roadway Deformation

Prestressed anchor-cables supporting technology has become the primary measure for reinforcing the roadway of deep coal mine and complex geological conditions. In this paper, fast Lagrangian analysis of continua (FLAC3D) code is used to analyze the laws of stress, deformation and failure of surrounding rock with and without roadway supporting by anchor-cables. The supporting action mechanism and effect of anchor-cables have been investigated into systematically. The results show that the anchor-cables supporting is adopted at reasonable positions of the roadway in good time which can improve the stress states of deep surrounding rock, decrease the range of failure zone around the roadway, control the roadway deformation effectively and maintain the stability of roadway.

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