Effects of the Deviatoric Stress Ratio on the Coal Failure and Permeability During Deep Mining

Xu, Chao; Fu, Qiang; Wang, Kai; Guo, Chaofei; Li, Xiaofang

doi:10.1007/s10706-020-01417-z

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…Ma [17] deduces the analytical expression of the deviatoric stress field of roadway surrounding rock and analyzes the plastic zone and deviatoric stress evolution law of roadway surrounding rock under different lateral pressure coefficient. Xu [18] simulated the distribution characteristics of the deviatoric stress field on the floor of the residual coal pillar of the coal seam; in the same horizontal plane, the deviatoric stress showed a saddle distribution, and with the increase of the width of the coal pillar, the deviatoric stress at the middle line and the edge of the coal pillar increased firstly and decreased continuously. Li [19] monitored the stress area of the roadway filling body and analyzed the failure mode of the filling body.…”

Section: Introductionmentioning

confidence: 99%

Research of Surrounding Rock Control of Gob-Side Entry Retaining Based on Deviatoric Stress Distribution Characteristics

Wang

Zhang

et al. 2022

Sustainability

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In view of the difficulty of the surrounding rock control of retaining a roadway along a goaf, this paper takes the 5504 working face of the Hongshuliang Coal Mine as the engineering context. The uniaxial compressive strength and tensile strength of concrete filling material in the retained roadway are determined by laboratory tests. Through theoretical analysis, field investigation, numerical simulation and field measurement, the distribution characteristics of deviatoric stress and damage zone of the roadway surrounding rock in the mining process of the 5504 working face are studied here. Based on the failure of rock mass element caused by deviatoric stress tensors, the study shows that the thickness of the concrete wall is 2.2 m and the compressive strength of the concrete wall can reach 10.87~11.64 MPa in 3 days to 4 days, which can meet the support strength of the retained roadway. From the position of 90 m in front of the working face to the position of 100 m behind the working face, the distribution form of the roadway surrounding rock deviatoric stress is: symmetrical butterfly shape → single butterfly shape → narrow oblique strip → oblique 8 shape → wide oblique strip shape. When the distance between the retained roadway and the working face is 49 m, the retained roadway tends to be stable. Based on the distribution characteristics of the deviatoric stress outline line and the damage zone outline line of the retained roadway surrounding rock, the retained roadway surrounding rock is divided into three regions, and the combined support technology of “bolt + anchor cable + single pillar + reinforcement combined with steel plate to strengthen concrete wall“ is proposed. Through field engineering practice, the maximum displacement of roof, floor, solid coal side and concrete wall side in the retained roadway is 136.6 mm, 78.8 mm, 62.3 mm and 43.3 m, respectively, and the surrounding rock control effect of the retained roadway is good.

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Section: Introductionmentioning

confidence: 99%

Research of Surrounding Rock Control of Gob-Side Entry Retaining Based on Deviatoric Stress Distribution Characteristics

Wang

Zhang

et al. 2022

Sustainability

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“…With the huge demand of economic development for energy and the gradual exhaustion of shallow coal resources, the depth of coal mining is increasing by 10-25 m per year in China [1,2]. The deep mining conditions are more complex with complicated geological structure, higher in situ stress, higher gas pressure, and lower permeability and strength of coal [3].…”

Section: Introductionmentioning

confidence: 99%

Key Strata Inducing Dynamic Disasters Based on Energy Condition: Criterion and Application

Yang

Sun

et al. 2021

Geofluids

Self Cite

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The thick and hard rock strata (THRS) exist widely in coal measure strata, which control the movements of overlying rock strata in stopes. When THRS break, great energy is released, which could aggravate the risks of coal and gas outburst, rock burst, and other dynamic disasters. Therefore, the foundation and key of preventing dynamic disasters are to distinguish the THRS that could induce coal-rock dynamic disasters and to analyze the laws of rock stratum breaking and energy releasing. The paper proposed the theoretical calculation methods of the energy accumulation and attenuation of rock breaking which is greatly affected by the hanging length of rock strata and the spreading distance. One or more roof strata that play a leading role in inducing dynamic disasters of the underlying coal mass are defined as the key disaster-inducing strata (KDIS). The disaster-inducing coefficient (DIC) is defined and used as the criterion of KDIS. The greater the source energy, the shorter the spreading distance, and the smaller the attenuation coefficient are, the easier the roof strata are to become KDIS. The disaster-inducing ability of the main THRS was analyzed, and the igneous sill was judged as KDIS, taking the Yangliu Coal Mine as project background. The breaking laws of the igneous sill were obtained by the methods of UDEC numerical simulation and microseismic monitoring, which verified the criterion of KDIS.

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Contributory Factors and Distribution Characteristics of Asymmetric Deformation in Deep Tunnel

Chen

Gao

et al. 2020

Geotech Geol Eng

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Effects of the Deviatoric Stress Ratio on the Coal Failure and Permeability During Deep Mining

Cited by 5 publications

References 32 publications

Research of Surrounding Rock Control of Gob-Side Entry Retaining Based on Deviatoric Stress Distribution Characteristics

Research of Surrounding Rock Control of Gob-Side Entry Retaining Based on Deviatoric Stress Distribution Characteristics

Key Strata Inducing Dynamic Disasters Based on Energy Condition: Criterion and Application

Contributory Factors and Distribution Characteristics of Asymmetric Deformation in Deep Tunnel

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