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| Shear performance of negative Poisson?s ratio bolt-anchored rock joints under dynamic cyclic shear loading |
| REN Shulin1, 2, HE Manchao2, TAO Zhigang2*, YIN Qian3, CHEN Xi4, LIU Wei5 |
(1. College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. State Key Laboratory of Tunnel Engineering, Beijing 100083, China; 3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; 4. Changjiang Survey, Planning, Design and Research Co., Ltd., Wuhan,
Hubei 430014, China; 5. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan, Hubei 430063, China) |
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Abstract Negative Poisson′s ratio (NPR) bolt steel is a novel high-strength, high-toughness anchor bolt material that has been independently developed. To investigate its dynamic cyclic shear resistance, shear tests were conducted on NPR bolt-anchored joints under cyclic dynamic loading. The effects of anchoring conditions, joint surface roughness, shear displacement amplitude (ua), and normal load on the dynamic cyclic shear performance were systematically analyzed. The results demonstrate that NPR anchor bolting significantly enhances the dynamic cyclic shear capacity of jointed rock masses. A smaller shear displacement amplitude (ua) leads to less mobilization of the bolt′s shear resistance and reduces frictional interlocking between joint surfaces, resulting in lower peak shear strength during the cyclic phase. As the cyclic shear displacement amplitude increases, the degradation effect of the bolt becomes more pronounced, heightening the likelihood of shear fracture. Under constant normal stiffness boundary conditions, the shear force-shear displacement curves exhibit significant plastic hardening characteristics across all phases, with an exception of a decline in the forward peak shear force (Ffp) at cycle numbers N = 1 to 2. In contrast, under constant normal load boundary conditions, the mechanical behavior exhibits plastic softening. A comparative study between traditional Q235 steel and NPR steel reveals that, under Q235 steel anchoring conditions, the peak shear resistance during the conventional shear phase increased by 62.21%, with fracture occurring at a shear displacement of 7.076 mm. In contrast, NPR anchor steel maintained high shear resistance throughout the test without fracturing, achieving a 140.90% increase in peak shear resistance, thereby demonstrating excellent resistance to dynamic cyclic shear loading.
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2026, Vol. 45 
