Experimental Investigation of the Mechanical Properties of Sandstone–Coal–Bolt Specimens with Different Angles under Conventional Triaxial Compression

Yu, Weijian; Wu, Genshui; Pan, Bao; Wu, Qiao; Liao, Zhihui

doi:10.1061/(asce)gm.1943-5622.0002005

Cited by 30 publications

(14 citation statements)

References 62 publications

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“…Liu et al [26] carried out multi-scale hierarchical analysis of rock mass and predicted its mechanical and hydraulic characteristics. Yu et al [27] conducted tests on mechanical properties of sandstone and coal bolts under conventional triaxial compression at different angles. Wu et al conducted experimental and theoretical research on the mechanical properties of coal rock bolt (RCB) composite system [28].…”

Section: Ground Stress Characteristicsmentioning

confidence: 99%

Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

Zhao

Zuo

Liu

et al. 2021

Advances in Civil Engineering

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The coal pillar stress distribution at the 311102 working face in the Bayangaole Mine is analyzed and revealed. In addition, borehole stressmeter, PASSAT monitoring system, and numerical modelling are fully utilized. Based on the patterns of acoustic wave velocity distribution, it is discovered that the impact created by mining activity can expand into the working face around 40 m, where the peak stress concentration is found about 15 m ahead. According to borehole stressmeter readings, mildly impacted, ordinarily impacted, and severely impacted zones are distinguished. The equilibrium theory and corresponding calculation indicated that the coal body in front of the working face has a plastic zone width of 4.96 m. The stress-displacement analysis based on numerical simulation showed that the relationship between peak vertical stress and pillar width is unimodal and bimodal. Specifically, both 5 and 10 m wide pillars showed a unimodal stress-width correlation and the peak vertical stresses are all located at the pillar center, whereas 15 m wide pillar has a bimodal stress-width relationship. In comparison, 10 m wide pillar holds the maximum in-situ stress. In consideration of site conditions and economic influences, 6 m wide coal strip coal pillar is designed at the working face 311102. As a result, stopping was successfully completed, and remarkable economic benefits were achieved.

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Section: Ground Stress Characteristicsmentioning

confidence: 99%

Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

Zhao

Zuo

Liu

et al. 2021

Advances in Civil Engineering

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“…Zhang et al [23][24][25] investigated the lower coal seam entry failure mechanism's characteristics under the remnant pillar by means of numerical simulations and in situ observations. Yu et al [5,[26][27][28][29] established the mechanical model of overlap arch bearing body in allusion to the united supporting characteristics of anchor, spray net, and cable bolt of deep wall rock, which are composed of the main compression arch (bolt supporting) and the second compression arch (intensive cable bolt supporting), and deduced neutral point theory of bolt and force transferring mechanism of cable bolt, strength equations of the bearing body of primary supporting and second supporting. Huang et al [30] proposed the concept of strong mining and large deformation of roadway from mechanical essence and engineering application, established the quantitative evaluation method of intense mining and large deformation, and considered that the large deformation of the surrounding rock structure of the roadway includes the large deformation of the whole movement caused by the large structure instability of the overlying strata and the large deformation of the movement of the fractured rock mass in the loosening circle.…”

Section: Introductionmentioning

confidence: 99%

Partitioning Control Mechanism and Engineering Practice of Rebuilding Bearing Arch in Surrounding Rock under High Ground Stress

2021

Advances in Civil Engineering

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The mining of coal seam has a significant influence on the stability of the roadway near it, especially under the condition of high ground stress. To study the control mechanism of the surrounding rock under the influence of high ground stress, a general idea for the partition control of the rebuilding bearing arch (RBA) was proposed in this paper. Based on the basic mechanical performance test of the bearing arch, this paper built a mechanical model of the RBA based on Protodyakonov’s pressure arch theory, analyzed the influence of the strength of the bearing arch on the surrounding rock failure, and obtained the ultimate thickness of the bearing arch failure under high ground stress. The results show that the RBA’s damage is closely related to the overburden load and RBA’s thickness. The tensile stress and shear stress of RBA increase linearly with the overburden load increase and increase sharply with the load-bearing arch’s thickness, showing a nonlinear relationship. To maintain the surrounding rock’s stability, it is necessary to ensure that the RBA’s thickness is within a specific range. The results are applied to the Wantian coal mine. The theoretically determined load-bearing thickness is 10 m, which can effectively control the surrounding rock deformation and significantly reduce the roadway’s repair rate.

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“…Water conduction of a KCC is related to the regional sedimentary environment, tectonic evolution, and karst water runoff conditions in the basement during its formation. After its formation, recompaction, cementation, weathering, and activation are the key factors [13][14][15][16][17][18][19][20]. The macroscopic subsection structure and water conduction (insulation) properties of a KCC are the geological basis to determine whether water inrush will occur when the KCC is exposed in the process of mining.…”

Section: Introductionmentioning

confidence: 99%

Geological Structure Exploration of Karst Collapse Column and Evaluation of Water Insulation Properties of the Mud Part

Liu

Bai

et al. 2021

Geofluids

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In this study, the X5 KCC in Shiquan Coal Mine was investigated by means of controlled source audio magnetotelluric exploration and borehole television. In this way, the subsection geological structure of the KCC was obtained. Next, the geological and electrical characteristics of each part were analyzed, and it is concluded that the development status of the mud part under coal seam floor is the key part to judging whether water inrush will occur during working face recovery under aquifer pressure. Furthermore, the mineral compositions of purplish-red mudstone and lime mudstone were obtained by performing an X-ray diffraction experiment on the KCC interstitial materials. On this basis, the water insulation properties of the mud part were qualitatively evaluated. Finally, the tensile strength of the mud part was obtained by the Brazilian splitting method, and the water insulation ability of the mud part at the periods when the tunneling roadway and the working face passed the KCC was calculated, respectively. The research results boast guiding significance for safe recovery of the working face passing KCCs under aquifer pressure.

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Experimental Investigation of the Mechanical Properties of Sandstone–Coal–Bolt Specimens with Different Angles under Conventional Triaxial Compression

Cited by 30 publications

References 62 publications

Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

Partitioning Control Mechanism and Engineering Practice of Rebuilding Bearing Arch in Surrounding Rock under High Ground Stress

Geological Structure Exploration of Karst Collapse Column and Evaluation of Water Insulation Properties of the Mud Part

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