A Case Study on the Control of Large Deformations in a Roadway Located in the Du’erping Coal Mine in China

Yang, Xujing; Hu, Chaowen; Liang, Jianhui; Zhou, Yubo; Ni, Guofeng; Huang, Ruifeng

doi:10.1155/2019/9628142

Cited by 12 publications

(8 citation statements)

References 34 publications

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“…Wang et al [11] put forward the concept of "integral support" and developed the support system of square steel restrained concrete. In view of the large deformation of the surrounding rock roadway in Du'erping coal mine, Yang et al [12] put forward a new "shell + anchor + shotcrete" combined support structure. According to the deformation characteristics of a soft rock roadway, Guo et al [13] studied the interaction mechanism between a new type of bolt (constant resistance large deformation bolt) and the surrounding rock.…”

Section: Introductionmentioning

confidence: 99%

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Yang

Liu

Yue

et al. 2020

Shock and Vibration

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Affected by the mining activities of the working face, the surrounding rock of the roadway is easily deformed and destroyed. For deep buried roadways, the deformation and destruction of the surrounding rock is particularly prominent. Under the influence of in situ stress fluctuation, 3−1103 tailgate of the Hongqinghe coal mine was in a complex stress environment with a maximum stress exceeding 20 MPa. Affected by mining stress, the roadway behind the working face was seriously deformed. In order to alleviate the deformation of the roadway, directional blasting and cutting measures for the 3−1103 tailgate were adopted in this paper. The mechanism of crack propagation in single-row to three-hole directional blasting was revealed by numerical simulation. The blasted rock was divided into three regions according to the crack condition. The numerical analysis of the cutting heights of 0 m, 10 m, 12 m, and 14 m, respectively, showed the stress peaks of different cutting heights and the deformation law of the surrounding rock. The pressure relief effect was the best at 14 m cutting height. At this time, the peak stress was 39 MPa with the smallest roadway deformation. Based on numerical simulation and theoretical analysis results, engineering tests were carried out. Field monitoring showed that the deformation of the roadway was inversely proportional to the roof cutting height. The higher the cutting height is, the more preferential the roadway is to reach the stable state. It can be concluded that directional blasting can change the surrounding rock structure, control the deformation of the roadway, and play a role in pressure relief. It provides a new measure to control roadway deformation.

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Section: Introductionmentioning

confidence: 99%

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Yang

Liu

Yue

et al. 2020

Shock and Vibration

Self Cite

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“…In particular, the high in situ stress combined with the softening of water causes a reduction in rock strength. e surrounding rock is squeezed out slowly, resulting in large deformation of the surrounding rock [29,30]. e tunnel is located in the high-stress section, which can be classified as IIB (stress dilatancy type).…”

Section: Stress Control Analysismentioning

confidence: 99%

Study on Deformation Mechanism and Support Measures of Soft Surrounding Rock in Muzhailing Deep Tunnel

Tao

Cao

Liu

et al. 2020

Advances in Civil Engineering

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The deformation of Muzhailing deep tunnel is about 2.3 m in the process of construction, which is difficult to be controlled by the traditional “anchor-grouting integration” support system. This paper deeply analyzes the geological characteristics, rock mechanics characteristics, and surrounding rock failure characteristics of Muzhailing tunnel. The deformation mechanism and the failure of the support system are analyzed through the numerical simulation, theoretical analysis, and field test. The authors propose support measures suitable for Muzhailing tunnel based on the analysis results. The maximum buried depth is 600 m, and the engineering rock mass at the depth has nonlinear physical and mechanical phenomenon. The maximum principal stress of Muzhailing tunnel is 25.7 MPa, which belongs to high-stress joint swelling soft rock tunnel. The NPR cable can achieve large deformation under the condition of constant support resistance. The authors put forward the coupling support mode of “NPR cable + steel arch frame + concrete,” which is based on the idea of transforming the composite deformation mechanism to a single type. The stress concentration appears in the range of 12 m in the surrounding rock circle, and the lateral and vertical stress distributions are relatively symmetrical after the improved support. The circumferential strain of the surrounding rock is greatly reduced, and the range of strain is reduced by 10%. The field monitoring results show that the new support system can well control the large soft rock deformation of Muzhailing tunnel (0.5 m). The support strategy proposed can effectively control the large deformation and promote the formation of new support concept for deep tunnel.

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“…e use of rock bolts and anchor cables has become an important and main support method for coal mine roadway support [1]. With the increasing depth of coal mining, the changeable geological structure in the environment of deep underground, the complex stress environment, and the large common deformation and failure of surrounding rock appear, while the conventional supporting methods show limitations [2,3].…”

Section: Introductionmentioning

confidence: 99%

Study on Double‐Shear Test of Anchor Cable and C‐Shaped Tube

Shan

Bao

Huang

et al. 2021

Shock and Vibration

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The free section of prestressed anchor cable is a weak part of support. A new supporting structure named Anchor Cable and C-Shaped Tube, which can bear transverse shear force, solves the problem that rock bolt and anchor cable are prone to shear failure in the free section and also solves the contradiction between high preload and low shear bearing capacity of support materials. Double-shear tests of Anchor Cable and C-Shaped Tube with smooth joint planes were carried out. Double-shear tests were carried out on the anchor cables with the diameter of 21.6 mm and the same type of Anchor Cable and C-Shaped Tube under different preload conditions. The influence of the preload on the shear performance of supporting materials and the enhancement effect of Anchor Cable and C-Shaped Tube supporting structure on the shear performance of anchor cables were analyzed. The test results confirm that Anchor Cable and C-Shaped Tube can improve the transverse shear resistance of the supporting material and increase the axial ultimate bearing capacity of the anchor cable during the shearing process. It is found that, during the double-shear test, the fracture form of the supporting materials is tensile fracture, and when it is sheared, Anchor Cable and C-Shaped Tube can reduce the stress concentration of the interaction between the joint surface and the surrounding rock and reduce the damage to the surrounding rock.

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A Case Study on the Control of Large Deformations in a Roadway Located in the Du’erping Coal Mine in China

Cited by 12 publications

References 34 publications

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Study on Deformation Mechanism and Support Measures of Soft Surrounding Rock in Muzhailing Deep Tunnel

Study on Double‐Shear Test of Anchor Cable and C‐Shaped Tube

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