Control Effects of Pretensioned Partially Encapsulated Resin Bolting with Mesh Systems on Extremely Soft Coal Gateways: a Large-Scale Experimental Study

Wang, Xingkai; Bai, Jianbiao; Jing, Shengguo; Su, Zhili; Tang, Qingteng

doi:10.1007/s00603-020-02141-z

Cited by 19 publications

(5 citation statements)

References 46 publications

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“…The above research results have achieved good results in soft coal roadway support engineering but more focus on general soft coal roadway surrounding rock control theory and technology. There are relatively few studies on the control principle of BMC-S in extremely soft coal seam roadways with compressive strength of less than 5 MPa [20,21]. Based on the engineering background of 11000 working face transportation roadways in the Quandian coal mine, this paper uses UDEC software to study the stress field, displacement field distribution characteristics, support stress characteristics, and loading arch structure characteristics of extremely soft coal seam roadway.…”

Section: Introductionmentioning

confidence: 99%

Application and Principle of Bolt-Mesh-Cable Control Technology in Extremely Soft Coal Seam Roadway

Zhang

Wang³

et al. 2023

Geofluids

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The extremely soft coal seam roadway has the problems of low surrounding rock strength and difficult support. Based on the engineering background of the mining roadway in the extremely soft coal seam of the Quandian coal mine, this paper adopts the research method combining numerical simulation and field measurement. The stress field, displacement field, support force, and loading arch structure characteristics of roadway surrounding rock under bolt-mesh-cable support and existing shed-cable support are compared, and the control principle of bolt-mesh-cable in extremely soft coal seam roadway is expounded. Our study indicated that compared with nonsupport and shed-cable support, the pressure stress range of the surrounding rock in extremely soft coal seam increases, and the stress gradient decreases when bolt-mesh-cable support is used. The roadway displacement and displacement difference decrease. The components of the support achieve stress coordination. The thickness of the loading arch formed in the surrounding rock is large, and the compressive stress in the arch is evenly distributed. The bolt-mesh-cable significantly improves the stress environment and the stability of the roadway. The field practice shows that the roadway deformation is small after the bolt-mesh-cable support is adopted, and the roadway section during excavation and mining meets the requirements of safety production.

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Section: Introductionmentioning

confidence: 99%

Application and Principle of Bolt-Mesh-Cable Control Technology in Extremely Soft Coal Seam Roadway

Zhang

Wang³

et al. 2023

Geofluids

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“…Regarding the research on the influence of pretension on the mechanical properties of rock bolts, some of the main results are as follows: Wang et al (2020) found that high bolt pretension force and mesh stiffness are of great significance for improving the bearing capacity of anchor mesh in coal, especially to reduce the degree of extrusion deformation and severe damage area. Aziz et al (2018) carried out a set of simple shear tests on fully sealed cable bolts using the newly developed integrated megabolt shear apparatus.…”

Section: Introductionmentioning

confidence: 99%

Influence of anchorage length and pretension on the working resistance of rock bolt based on its tensile characteristics

Chang

Pang

et al. 2021

Int J Coal Sci Technol

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In coal mining roadway support design, the working resistance of the rock bolt is the key factor affecting its maximum support load. Effective improvement of the working resistance is of great significance to roadway support. Based on the rock bolt’s tensile characteristics and the mining roadway surrounding rock deformation, a mechanical model for calculating the working resistance of the rock bolt was established and solved. Taking the mining roadway of the 17102 (3) working face at the Panji No. 3 Coal Mine of China as a research site, with a quadrilateral section roadway, the influence of pretension and anchorage length on the working resistance of high-strength and ordinary rock bolts in the middle and corner of the roadway is studied. The results show that when the bolt is in the elastic stage, increasing the pretension and anchorage length can effectively improve the working resistance. When the bolt is in the yield and strain-strengthening stages, increasing the pretension and anchorage length cannot effectively improve the working resistance. The influence of pretension and anchorage length on the ordinary and high-strength bolts is similar. The ordinary bolt’s working resistance is approximately 25 kN less than that of the high-strength bolt. When pretension and anchorage length are considered separately, the best pretensions of the high-strength bolt in the middle of the roadway side and the roadway corner are 41.55 and 104.26 kN, respectively, and the best anchorage lengths are 1.54 and 2.12 m, respectively. The best anchorage length of the ordinary bolt is the same as that of the high-strength bolt, and the best pretension for the ordinary bolt in the middle of the roadway side and at the roadway corner is 33.51 and 85.12 kN, respectively. The research results can provide a theoretical basis for supporting the design of quadrilateral mining roadways.

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“…Regarding the research on the influence of pretension on the mechanical properties of rock bolts, some of the main results are as follows: Wang et al found that high bolt pretension force and mesh stiffness are of great significance for improving the bearing capacity of anchor mesh in coal, especially to reduce the degree of extrusion deformation and severe damage area [1]. Aziz et al carried out a set of simple shear tests on fully sealed cable bolts using the newly developed integrated megabolt shear apparatus [2].…”

Section: Introductionmentioning

confidence: 99%

“…2(c) has been deformed. Owing to the deformation in the surrounding rock, the non-anchorage length1 l is usually lengthened, and the non-anchorage length is represented by 3 l .Fig. 2(d)shows the actual stress situation of the bolt at point B, which can be obtained by the superposition of the rock mass state shown in Figs.…”

mentioning

confidence: 99%

Study on the Influence of Anchorage Length and Pretension on the Working Resistance of Rock Bolt Based on its Tensile Characteristics

Chang

Pang

et al. 2021

Preprint

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In coal mining roadway support design, the working resistance of the rock bolt is the key factor affecting its maximum support load. Effective improvement of the working resistance is of great significance to roadway support. Based on the rock bolt’s tensile characteristics and the mining roadway surrounding rock deformation, a mechanical model for calculating the working resistance of the rock bolt is established and solved. Taking the mining roadway of the 17102 (3) working face at the Panji 3# Well Coal Mine of China as a research site, with a quadrilateral section roadway, the influence of pretension and anchorage length on the working resistance of high-strength and ordinary rock bolts in the middle and corner of the roadway is studied. The results show that when the bolt is in the elastic stage, increasing the pretension and anchorage length can effectively improve the working resistance. When the bolt is in the yield and strain-strengthening stages, increasing the pretension and anchorage length cannot effectively improve the working resistance. The influence of pretension and anchorage length on the ordinary and high-strength bolts is similar. The ordinary bolt’s working resistance is approximately 25 kN less than that of the high-strength bolt. When pretension and anchorage length are considered separately, the best pretensions of the high-strength bolt in the middle of the roadway side and the roadway corner are 41.55 and 104.26 kN, respectively, and the best anchorage lengths are 1.54 and 2.12 m, respectively. The best anchorage length of the ordinary bolt is the same as that of the high-strength bolt, and the best pretension for the ordinary bolt in the middle of the roadway side and at the roadway corner is 33.51 and 85.12 kN, respectively. The research results can provide a theoretical basis for supporting the design of quadrilateral mining roadways.

show abstract

Control Effects of Pretensioned Partially Encapsulated Resin Bolting with Mesh Systems on Extremely Soft Coal Gateways: a Large-Scale Experimental Study

Cited by 19 publications

References 46 publications

Application and Principle of Bolt-Mesh-Cable Control Technology in Extremely Soft Coal Seam Roadway

Application and Principle of Bolt-Mesh-Cable Control Technology in Extremely Soft Coal Seam Roadway

Influence of anchorage length and pretension on the working resistance of rock bolt based on its tensile characteristics

Study on the Influence of Anchorage Length and Pretension on the Working Resistance of Rock Bolt Based on its Tensile Characteristics

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