层状板岩动静拉伸力学特性及破坏模式研究  

Study on dynamic and static mechanical properties and failure mode of layered slate

作　　者：刘运思[1,2] 何楚韶 傅鹤林[3] 王世鸣[2] 雷勇[1,2] 彭亚雄 LIU Yunsi;HE Chushao;FU Helin;WANG Shiming;LEI Yong;PENG Yaxiong(Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan 411201,China;School of Civil Engineering,Hunan University of Science&Technology,Xiangtan 411201,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室,湖南湘潭411201 [2]湖南科技大学土木工程学院,湖南湘潭411201 [3]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2020年第11期2789-2797,共9页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51704109,51604109,51878270);湖南省自然科学基金资助项目(2020JJ5179)。

摘　　要：为探究层状板岩动静拉伸力学特性和破坏模式,以SHPB系统和RMT-150C岩石压力机为研究手段,进行层状板岩拉伸强度和破坏模式随加载率和层理面与加载方向不同夹角变化的规律研究。研究结果表明:随着加载率的增加,不同层理角度下板岩动态拉伸强度均呈现非线性指数增长的趋势;当层理角度θ为0°时,动态拉伸强度处于低强度区间,破坏形式为沿层理面拉伸破坏;当层理角度θ为15°,30°和45°时,动态拉伸强度处于中等强度区间,破坏形式为沿层理面剪切破坏和沿非层理面拉伸破坏;当层理角度θ为60°,75°和90°时,动态拉伸强度处于高强度区间,破坏形式为沿非层理面拉伸破坏。随着加载率的提高,板岩强度各向异性系数N逐渐降低,并趋近于1;当加载率超过600 GPa/s时,拉伸强度主要受加载率的影响;加载率低于600 GPa/s时,层状板岩的拉伸强度受角度和加载率共同影响。To investigate the dynamic and static tensile properties and failure modes of layered slate,this paper uses SHPB system and RMT-150C Rock pressure machine as research methods to develop the tensile strength and failure mode of layered slate with loading rate and bedding angle.The main conclusions obtained by studying this paper are as follows.With the increase of loading rate,the dynamic tensile strength of slate under different bedding angles showed a trend of nonlinear exponential growth.When the bedding angle is 0°,the dynamic tensile strength is in the low-strength value,and the failure form is tensile failure along the bedding plane.When the bedding angle is 15°,30°and 45°,the dynamic tensile strength is in the medium strength value,and the failure form is shear failure along the bedding plane and tensile failure along the non-layered surface.When the bedding angle is 60°,75°and 90°,the dynamic tensile strength is in the high strength range,and the failure form is tensile failure along the non-layered surface.With the increase of the loading rate,the strength anisotropy coefficient of slate gradually decreases and approaches 1.When the loading rate exceeds 600 GPa/s,the tensile strength of the layered slate is mainly affected by the loading rate.When the loading rate is lower than 600 GPa/s,the tensile strength of the layered slate is affected by the bedding plane and loading rate.

关 键 词：层状板岩 动静拉伸强度 加载率 各向异性 破坏模式 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]