循环荷载作用下岩体结构面的力学特性  

Mechanical properties of rock mass structural plane under cyclic loading

作　　者：宋亮 方晶 邓星 刘莹莹 李雄杰 张琰其 SONG Liang;FANG Jing;DENG Xing;LIU Yingying;LI Xiongjie;ZHANG Yanqi(School of Civil Engineering and Architecture,Wuhan Polytechnic University,Wuhan 430023,China)

机构地区：[1]武汉轻工大学土木工程与建筑学院,武汉430023

出　　处：《武汉轻工大学学报》2024年第6期103-107,116,共6页Journal of Wuhan Polytechnic University

基　　金：武汉轻工大学2021年大学生科研项目(编号:xsky2021143).

摘　　要：地震动态循环荷载下岩体结构面循环剪切力学特性对工程岩体的安全稳定起着至关重要的作用。为了研究多因素耦合对真实结构面剪切力学特性的影响,通过巴西劈裂法获得真实结构面,运用3D扫描、打印技术制作岩体结构面模板,采用倒模法批量制备待剪试件,进行循环剪切试验,研究法向压力、试件强度和结构面粗糙度对结构面剪切力学特性的影响。结果表明:(1)随着剪切位移的增加,剪应力在第1次循环的初始阶段呈上升趋势,随后缓慢降低,在越过原点时,剪应力开始再次提升;(2)在不同的法向应力下,随着剪切次数的增加,最大剪应力有下降趋势,且试件磨损程度更加严重;(3)法向应力、试件强度和结构面粗糙度越大,剪应力越大。研究结果可为实际的岩体工程参数设计提供理论指导。Cyclic shear mechanical properties of rock discontinuities under dynamic cyclic seismic loads play an important role in the safety and stability of engineering rock masses.In order to study the multi-factor coupling to the real structure,the Brazilian splitting method was used to obtain the real structure plane,while 3D scanning and printing technology were adopted to make rock mass structural surface templates.In addition,reverse mould method was employed to make preparations in batch for shear specimens,and then the cyclic shear tests are carried out to research the effects of the normal pressure,the structure of the specimen strength and surface roughness on the mechanical properties of structural plane shear.The experimental results show that:(1)With the increase of shear displacement,the shear stress increases in the initial stage of the first cycle and then decreases slowly.When crossing the origin,the shear stress begins to increase again.(2)Under different normal stresses,the maximum shear stress decreases with the increase of shear times,and the wear degree of specimens becomes more serious.(3)The shear stress increases with the increase of normal stress,specimen strength and roughness of structural plane.The research results can provide theoretical guidance for the parameter design of practical rock mass engineering.

关 键 词：岩体结构面 循环剪切 力学特性 影响因素 

分 类 号：TU458[建筑科学—岩土工程]