Deformation and failure mechanism of surrounding rocks in crossed-roadway and its support strategy

Wang, Hui; Cheng, Jin; Zheng, Pengfei; Li, Nan; Zhan, Yubao

doi:10.1016/j.engfailanal.2020.104743

Cited by 38 publications

(14 citation statements)

References 24 publications

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“…Bottom dilation is a common feature for the deformation of soft rock roadways [25][26][27]. Experimental and theoretical analyses have been used to understand the mechanism of large deformation of soft rock [28][29][30], based on which a series of combination support schemes have been proposed [31][32][33]. Among them, grouting support is widely used because of its good performance [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Large Deformation Characteristics of Surrounding Rock and Support Technology of Shallow-Buried Soft Rock Roadway: A Case Study

Zhu

Yao

et al. 2022

Applied Sciences

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The coal resources in the coal-rich area of western China are mostly located in the late diagenetic Cretaceous and Jurassic strata. In this paper, a study on the support of soft rock roadways was carried out in the background of the soft rock track roadway in the Jiebangou coal mine. The field investigation showed that the surrounding rocks of the roadway were weak, soft, and broken, and the surrounding rocks were cemented, with the roadway local deformation exceeding 1 m. The borehole television results showed that the surrounding rocks were mainly weak sandy mudstone and yellow mudstone. The average uniaxial compressive strength of the surrounding rock was 15.49 MPa. The roadway is a shallow buried soft rock roadway; site investigation revealed that the original U-shaped steel shed had an extremely low resistance to slip, the filling body behind the U-shaped steel shed fell off, the interaction between the U-shaped steel shed and the surrounding rock was poor, the U-shaped steel shed could not provide sufficient timely support resistance, and the bearing capacity of the U-shaped steel shed was far from consideration. The floor was not effectively supported. The floor had different degrees of the bottom drum, and frequent undercover caused new stress disturbances, which loosened the bottom corners of both rock types and made the shed legs move continuously inward, reducing the bearing capacity and actual support resistance of the bracket. Numerical calculations were performed to study the deformation characteristics of the surrounding rock of the tunnel and the yielding damage characteristics of the brace. The results showed that the current U-shack support strength was insufficient, the two sides were deformed by 950 mm, the bottom of the roadway bulged by 540 mm, and the surrounding rock was mainly shear damaged. The fall of the filler behind the shed caused damage to the U-shaped steel shed spire. Through site investigation results and numerical calculations, the deformation and damage characteristics of the soft rock roadway and its damage causes were analyzed, and the support technology system of ‘strengthening support for weak structural parts’ was proposed. This improved the mechanical properties of the weak structural support body, the stress state of the local surrounding rock, and the bearing capacity of the support structure, and effectively controlled the deformation, damage, and instability of the surrounding rock of the roadway, and deformation, damage, and destabilization of the roadway, thereby achieving overall stability for the surrounding rock of the roadway.

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Section: Introductionmentioning

confidence: 99%

Large Deformation Characteristics of Surrounding Rock and Support Technology of Shallow-Buried Soft Rock Roadway: A Case Study

Zhu

Yao

et al. 2022

Applied Sciences

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“…The deformation of the coal roadway surrounding rock can be controlled by injecting cement slurry into the coal seam 26,27 . Therefore, grouting reinforcement shows an excellent support to the coal roadway, which can reduce the scope of failure zones 28 . Furthermore, the injection of cement slurry or grouting can strengthen the coal seam, increase its rigidity, and reduce the volumetric expansion due to gas energy release 29 .…”

Section: Introductionmentioning

confidence: 99%

Deformation and fracture behavior of strong–weak coupling structure and its application in coal roadway instability prevention

Zheng

Zhai

Jian-guo

et al. 2021

Fatigue Fract Eng Mat Struct

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The theoretical work, experiments, and practical application in the field are carried out to investigate the performance of strong–weak coupling structure. Results indicate that the deformation in the weak zone is greater than that in the strong zone before the peak stress. Moreover, the weak zone is crushed while the strong zone remains intact after the peak stress. Hence, the coupling structure could protect the strong zone from damage. Furthermore, the strong–weak coupling structure can effectively transfer the peak stress to the further area from coal roadway and improve the ability of the coal roadway surrounding rock to resist deformation. Finally, in the field tests, the strong–weak structure can significantly improve the stability of coal roadway. It shows that the average subsidence of the roadway roof and the accumulated deformation on the sides of the coal roadway in the strong–weak coupling zone were 55.21% and 61.42% lesser than those in the weak zone, respectively.

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“…With the continuous development of China's roadway support technology, its support mode gradually changes from the traditional passive support forms such as woodpile support, concrete masonry support, and steel frame support to the active support forms such as bolt shortcoming support, bolt mesh cable shortcoming support and bolt grouting support, and the properties of support materials also change from low strength and low elongation to high strength and high elongation [15][16][17][18][19]. Generally speaking, roadway support form and strength design are closely related to the surrounding rock mining conditions and instability mode.…”

Section: Introductionmentioning

confidence: 99%

Surrounding Rock Stability Control Technology of Roadway in Large Inclination Seam with Weak Structural Plane in Roof

Chen

et al. 2021

Minerals

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The surrounding rock control technology of mining roadways in large inclination seams with a weak structural plane in the roof is one of the most challenging fields in underground roadway support. In view of the serious deformation of the surrounding rock of the transportation roadway in the 1201 working face of a mine, the deformation and failure characteristics and instability mechanism of the surrounding rock of the roadway are analysed. The self-stability mechanical model of the roof block structure of the roadway with a large inclination under the support effect is established, and the support concept of “high pre-stressed asymmetric” and the combined support method of bolts, wire mesh, and cables are proposed. The rationality of the supporting scheme is verified by numerical simulation. The results show that: compared with bolt and wire mesh support, the maximum shear displacement of the roof’s weak layer under the combined support of bolt, wire meshes, and cable before and after mining is reduced by 86.78% and 83%, respectively, and the maximum total displacement of surrounding rock surface is reduced by 49.22% and 37.1%, respectively. The field monitoring results show that the combined support scheme can effectively control the deformation of the surrounding rock.

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Deformation and failure mechanism of surrounding rocks in crossed-roadway and its support strategy

Cited by 38 publications

References 24 publications

Large Deformation Characteristics of Surrounding Rock and Support Technology of Shallow-Buried Soft Rock Roadway: A Case Study

Large Deformation Characteristics of Surrounding Rock and Support Technology of Shallow-Buried Soft Rock Roadway: A Case Study

Deformation and fracture behavior of strong–weak coupling structure and its application in coal roadway instability prevention

Surrounding Rock Stability Control Technology of Roadway in Large Inclination Seam with Weak Structural Plane in Roof

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