(1. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, Shandong 266590, China; 2. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China; 3. Graduate School
of Engineering, Nagasaki University, Nagasaki 852–8521, Japan; 4. Coal Mining Research Institute Co., Ltd. of CCTEG,
Beijing 100013, China)
Abstract：Anchorage support is extensively utilized in the stability control of underground structures. The performance of such support varies with anchorage parameters, particularly influenced by the relative position between the anchorage section and the joints in the surrounding rock, which significantly affects the shear resistance of the bolts. To investigate the impact of anchorage parameters on the shear mechanical behavior of bolted joints, a series of shear tests were conducted with varying anchorage lengths and thicknesses. The results indicate that, for a given anchorage thickness, increasing the anchorage length enhances the average shear peak strength and the rod breaking strength by 3.15% and 2.56%, respectively, while simultaneously reducing the average deformation range and the breaking displacement of the bolts by 18.41% and 16.48%, respectively. For a constant anchorage length, an increase in anchorage thickness improves the average shear peak strength and breaking strength by 1.93% and 1.64%, respectively. Post-failure, the deformed bolts exhibit an “S”-shaped profile. As the anchorage length increases, the deformation becomes more symmetric, the normal displacement at peak failure decreases, the axial force reduces, and the shear force provided by the bolts increases. In the pre-peak stage, the ring-down count and energy account for 61.7% and 58.5% of the total, respectively, while the b-value reaches its lowest point at the shear peak. During the post-peak deformation stage, the b-value continuously rises, peaking at the breaking point. Through Gaussian Mixture Model (GMM) statistics of crack types, it is concluded that the shear failure of the bolted joint predominantly occurs in shear, with an average of 86.05% attributed to acoustic emission shear failure and only 13.95% to tensile failure.
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2026, Vol. 45 
