白砂岩、大理岩及花岗岩加锚剪切力学特性研究  

Study on shear mechanical properties of sandstone,marble and granite after anchoring

作　　者：刘泉声[1,2,4] 雷广峰 彭星新[1,3] 魏莱 罗慈友[1,3] LIU Quansheng;LEI Guangfeng;PENG Xingxin;WEI Lai;LUO Ciyou(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, Wuhan University,Wuhan,Hubei 430072,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]武汉大学岩土与结构工程安全湖北省重点实验室,湖北武汉430072 [3]中国科学院大学,北京100049 [4]山东矿业学院

出　　处：《岩石力学与工程学报》2018年第A02期4007-4015,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2014CB046904);国家自然科学基金面上项目(51774267)~~

摘　　要：为研究不同自然岩石材料锚杆锚固前后剪切力学特性的改变,选取白砂岩、大理岩及花岗岩3种代表性的岩石,对其切割、钻孔、锚固、养护后进行直接剪切试验,每种岩石材料分为无锚与加锚2种情况,试验中设置3组法向应力级别,探究不同自然岩石材料在不同法向力及剪切力作用下的受力和变形特征,对比分析岩性及节理面法向应力等因素对加锚节理岩体剪切力学特性的影响规律。试验结果表明:自然岩石与水泥砂浆等类岩石材料的加锚力学特性具有一定差别,锚杆锚固能够增加岩石节理面的当量黏聚力及内摩擦角,岩石材料的抗压强度对加锚节理面力学特性具有重大影响,岩性越软,岩石的加锚力学特性与类岩石材料越相近,岩性越硬,锚杆对岩石节理面抗剪强度的提高幅度越大,锚杆加固效果越显著。In order to study the change of shear mechanical properties of different natural rock materials before and after anchoring,three representative rocks of white sandstone,marble and granite were selected,and the direct shear test was carried out after the rocks were drilled,anchored and cured. Each rock material is divided into two kinds of conditions,anchorage and without anchorage,three normal stress levels are adopted in the test. The stress and deformation characteristics of different natural rock materials under different normal forces and shear forces are explored,and the influence of the normal stresses and rock properties on the shear mechanical properties of anchoring jointed rock mass is compared and analyzed. The experimental results show that there are some differences in the anchoring mechanical properties between natural rock and the rock-like material such as cement mortar,the equivalent cohesion and internal friction angle of rock joint surface can be increased by bolt anchorage. The compressive strength of the rock material has a significant effect on the mechanical properties of the bolted joints,the weaker the rock is,the more similar in the anchoring mechanical properties of the rock and the rock-like material are; the harder the rock is,the greater the increase in the shear strength of the anchoring joints,the more significant in the reinforcement effect.

关 键 词：岩石力学 自然岩石 锚杆锚固 抗剪强度 试验研究 

分 类 号：TU45[建筑科学—岩土工程]