Influence of Microroughness on Stick–Slip Characteristics of Fault Under Constant Normal Stiffness

Zhang, Chuanqing; Xu, Jie; Jin, Shengji; Li, Xiaoshun; Cui, Guojian; Guo, Yuhang; Meng, Fanyong; Zhou, Hui; Shangyuan, Yan

doi:10.1007/s00603-022-02778-y

Cited by 14 publications

(1 citation statement)

References 25 publications

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“…The bonding strength between the bolt and the resin is crucial for the effectiveness of anchorage performance. The rebar bolt profile is the point influencing the coupling effect between the bolt and the resin [15][16][17][18][19][20]. In this study, an optimized left spiral rebar bolt is designed and tested in laboratory and in fields; its installing and bolting performances were compared to conventional left and right spiral rebar bolts commonly used in underground coal mine under different surrounding rock conditions, which provided an experimental basis for new rebar bolt suitable for large deformational roadway support.…”

Section: Introductionmentioning

confidence: 99%

Anchorage Performance of a New Left Spiral Rebar bolt under Different Surrounding Rock Strength and borehole Depth

Zhang,

Cao,

et al. 2023

Preprint

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The theory and technology of rock bolting are fundamental research topics for strata control in civil and mining engineering. Rebar bolts are commonly used for roadway primary support in underground coal mine. To adapt to deep resource mining, a new left spiral rebar bolt has been developed. Compared to conventional rebar bolts, the result of installation test showed that the new bolt reduced of 41.5% and 57.9% in stirring resistance force and torque, respectively. In laboratory pullout tests, PVC and aluminum sleeves were used to simulate weak and medium strength surrounding rocks. The average peak pullout force, displacement at the peak load and energy absorption increased by 27%, 107% and 108%, respectively, using PVC sleeve; and increased by 113%, 109% and 212%, respectively, using aluminum sleeve. Field tests were conducted under soft coal, hard coal and medium strength rock geo-conditions. Different borehole depths were selected to precisely calculate the average anchorage performance of the new bolt. Results showed that the average peak pullout force of the new bolt increased by 37%, 38% and 28%, respectively, under different surrounding rock conditions. Moreover, based on a huge amount of on-site test results, the pullout curves in field-testing were summarised and classified into 6 different patterns, which were discussed from a viewpoint of causality mechanism. The research findings validate that the newly developed bolt has better anchorage performance com-pared to conventional rebar bolts, making it a new anchorage material for deep resource mining.

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