Study on failure mechanism of roadway with soft rock in deep coal mine and confined concrete support system

2017 ◽  
Vol 81 ◽  
pp. 155-177 ◽  
Author(s):  
Q. Wang ◽  
R. Pan ◽  
B. Jiang ◽  
S.C. Li ◽  
M.C. He ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
Support System ◽  
Coal Mine ◽  
Soft Rock ◽  
Confined Concrete ◽  
Deep Coal Mine

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.

scholarly journals Support failure of a high-stress soft-rock roadway in deep coal mine and the equalized yielding support technology: a case study

2015 ◽  
Vol 2 (4) ◽  
pp. 279-286 ◽  
Author(s):  
Lihui Sun ◽  
Haoyuan Wu ◽  
Bensheng Yang ◽  
Qiangqiang Li
Keyword(s):  
Coal Mine ◽  
High Stress ◽  
Soft Rock ◽  
Deep Coal Mine ◽  
Yielding Support ◽  
Soft Rock Roadway ◽  
Rock Roadway

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

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".

scholarly journals A Case Study on Large Deformation Failure Mechanism and Control Techniques for Soft Rock Roadways in Tectonic Stress Areas

2019 ◽  
Vol 11 (13) ◽  
pp. 3510 ◽  
Author(s):  
Xue ◽  
Gu ◽  
Fang ◽  
Wei
Keyword(s):  
Numerical Simulation ◽  
Large Deformation ◽  
Failure Mechanism ◽  
Support System ◽  
Soft Rock ◽  
Tectonic Stress ◽  
Geological Conditions ◽  
Soft Rock Roadway ◽  
Rock Roadway

Large deformation and failure of soft rock are pressing problems in the mining practice. This paper provides a case study on failure mechanisms and support approaches for a water-rich soft rock roadway in tectonic stress areas of the Wangzhuang coal mine, China. Mechanic properties of rock mass related to the roadway are calibrated via a geological strength index method (GSI), based on which a corresponding numerical simulation model is established in the Universal Discrete Element Code (UDEC) software. The failure mechanism of the roadway under water-saturating and weathering conditions is revealed by field tests and numerical simulation. It is found that the stress evolution and crack development are affected by weathering and horizontal tectonic stresses. The roadway roof and floor suffer from high stress concentration and continuous cracking, and are consequently seen with rock failure, strength weakening, and pressure relief. Unfortunately, the current support system fails to restrain rock weathering and strength weakening, and the roadway is found with serious floor heave, roof subsidence, and large asymmetric deformation. Accordingly, a new combined support system of “bolt–cable–mesh–shotcrete + grouting” is proposed. Moreover, numerical simulation and field testing are conducted to validate the feasibility and effectiveness of the proposed approach, the results of which demonstrate the capacity of the proposed new support method to perfectly control the surrounding rock. Findings of this research can provide valuable references for support engineering in the soft rock roadway under analogous geological conditions.

scholarly journals Fracturing of the Soft Rock Surrounding a Roadway Subjected to Mining at Kouzidong Coal Mine

2020 ◽  
Vol 2020 ◽  
pp. 1-17 ◽  
Author(s):  
Zhili Su ◽  
Wenbing Xie ◽  
Shengguo Jing ◽  
Xingkai Wang ◽  
Qingteng Tang
Keyword(s):  
Failure Mechanism ◽  
Coal Mine ◽  
Shear Failure ◽  
Soft Rock ◽  
Surrounding Rock ◽  
Asymmetric Distribution ◽  
Rock Layer ◽  
Imaging Results ◽  
Fracture Development ◽  
Borehole Imaging

The fracture development and distribution around the deep soft rock roadway are pivotal to any underground design. In this paper, both field investigation and numerical simulation were taken to study the fracture evolution and rock deformation of a coal mine roadway at Kouzidong mine, Fuyang, Anhui Province, China. Based on the borehole imaging technique, we found an asymmetric distribution of the fracture zone in the surrounding rock of the roadway. By analyzing the C value of the fractures in the borehole images,we found that the fracture interval distribution of the surrounding rock of the tunnel, the number of fractures will fluctuate decrease with the increase of the depth. To effectively study the fracture propagation and distribution of the roadway under longwall retreatment and roadway excavation, the global-local numerical technique was applied via FLAC3D and PFC2D. In the roadway excavation process, fractures were first formed in the shallow section of the roadway and progressively propagated toward the deeper soft rock layer; the main failure mechanism was a tensile failure. During longwall retreatment, fractures continuously developed toward the deeper soft rock layer. However, the failure mechanism transformed to shear failure. From numerical results, it can be seen that the stress concentration at the ribs was released, which led to shear failure at the roof and floor. Due to the extensive tensile cracks in the shallow section, the surrounding rock experienced expansion and fracture. The deep shear failure also induced the formation of the nonadjacent crushing zone and elastic zone, which is in line with the borehole imaging results.

Failure mechanism of surrounding rock with high stress and confined concrete support system

2018 ◽  
Vol 102 ◽  
pp. 89-100 ◽  
Author(s):  
Qi Wang ◽  
Bei Jiang ◽  
Rui Pan ◽  
Shu-Cai Li ◽  
Man-Chao He ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
Support System ◽  
High Stress ◽  
Surrounding Rock ◽  
Confined Concrete

Experimental Study on Failure Mechanism of Soft Rock Roadway in Yangcheng Coal

2014 ◽  
Vol 675-677 ◽  
pp. 1381-1384
Author(s):  
Rong Chao Wang ◽  
Yun Liang Tan
Keyword(s):  
Failure Mechanism ◽  
Coal Mine ◽  
Soft Rock ◽  
Drill Hole ◽  
Deformation Analysis ◽  
Geological Conditions ◽  
Depth Study ◽  
Seam Mining ◽  
Soft Rock Roadway ◽  
Rock Roadway

For the mutual disturbance several roadway excavation, it is difficult to support the roadway and damage is more serious, the original supporting scheme has been out of action, so the article by using the method of field test, theoretical analysis and laboratory experiments on the Yangcheng coal mine soft rock roadway destruction mechanism of in-depth study, based on the theoretical and experimental data measured results were analyzed, and according to the deformation analysis of Yangcheng mine lane, the failure characteristics and causes of roadway, also according to each drill hole core lithology and laboratory test, the basic physical and mechanical parameters, provides a reliable data of Yangcheng coal mine soft rock roadway failure mechanism, for similar geological conditions of coal seam mining also provides practical guidance significance.

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