锚固角度对节理岩体动态压剪响应的影响研究  

Effect of anchorage angle on dynamic compression-shear response of jointed rock mass

作　　者：殷志强[1,2] 张驰[2] 张志雄 齐潮 章新生 曹坤 YIN Zhiqiang;ZHANG Chi;ZHANG Zhixiong;QI Chao;ZHANG Xinsheng;CAO Kun(Coal Mine Safety Mining Equipment Innovation Center of Anhui Province,Anhui University of Science and Technology,Huainan Anhui 232001,China;School of Mining Engineering,Anhui University of Science and Technology,Huainan Anhui 232001,China;College of Civil Engineering and Architecture,Beibu Gulf University,Qinzhou Guangxi 535011,China;The Fifth Construction Ltd.of China Tiesiju Civil Engineering Group,Jiujiang Jiangxi 332000,China)

机构地区：[1]安徽理工大学安徽省煤矿安全采掘装备制造业创新中心,安徽淮南232001 [2]安徽理工大学矿业工程学院,安徽淮南232001 [3]北部湾大学建筑工程学院,广西钦州535011 [4]中国中铁四局集团第五工程有限公司,江西九江332000

出　　处：《矿业科学学报》2025年第2期163-172,共10页Journal of Mining Science and Technology

基　　金：国家自然科学基金(52274070,52227901);安徽理工大学研究生创新基金项目(2023CX2034);2024广西应急管理联合创新科技攻关项目(2024GXYJ033)。

摘　　要：为探究锚固角度对贯通节理岩体动态力学特性和锚固体破坏行为的影响。利用分离式霍普金森压杆系统,对锚固角度为15°、30°、45°、60°和75°的全锚节理岩体进行动载冲击试验,分析不同锚固角度下锚固岩体动态应力应变、锚固锚杆应变与锚固基体滑移压剪行为。结果表明:随锚固角度的增加,锚固体峰值应力呈先增大再减小的趋势,分别为15.8、18.1、20.9、24.7和23.3 MPa,在锚杆抵抗压剪作用下锚固体的动态应力应变曲线呈“双峰”形态;在岩体压剪行为下锚杆轴向应变呈降低趋势,冲击瞬间锚杆应变率随角度的增加出现下降,45°锚固角度下位于节理面左右侧的应变片所监测的应变幅值接近;锚固体受载端沿冲击方向位移呈现逐渐减小趋势,分别为4.84、1.71、1.40、1.01和0.84 mm,锚杆抵抗锚固基体沿节理面压剪滑移的能力逐渐增强。This study aims explore the effect of different anchorage angles on the dynamic mechanical properties of jointed rock mass and the failure behavior of anchorage body.We conducted the dynamic load impact test on fully anchored jointed rock mass with anchorage angles of 15°,30°,45°,60°and 75°by using the split Hopkinson pressure bar system to analyze the dynamic stress and strain of an-chored rock mass,the strain of anchored bolt and the sliding compression-shear behavior of anchored matrix under different anchorage angles.Results show that with the increase of anchoring angle,the peak stress of anchorage body demonstrate initial increase and subsequent decrease,namely 15.8,18.1,20.9,24.7 and 23.3 MPa,respectively.The dynamic stress-strain curve of anchorage body un-der compression and shear resistance of anchor rod exhibits a“double peak”shape.Under the com-pression-shear behavior of rock mass,the axial strain of bolt shows a decreasing trend,and the strain rate of bolt decreases with the increase of angle at the moment of impact.The strain amplitude moni-tored by strain gauges on the left and right sides of joint surface is close to each other at 45°anchoring angle.The displacement of the loading end of the anchorage body decreases gradually along the impact direction,namely 4.84,1.71,1.40,1.01 and 0.84 mm,respectively.The ability of the bolt is grad-ually enhanced to resist the compression-shear slip of the anchorage body along the joint surface.

关 键 词：锚固角度 贯通节理 应力 锚杆应变 滑移压剪 

分 类 号：TD32[矿业工程—矿井建设] TU45[建筑科学—岩土工程]