花岗岩硬性结构面剪切强度特性模型试验研究  

Model Test Study on Shear Strength Characteristics of Granite Hard Structural Plane

作　　者：赖冠宙 黄帆 温辉波 LAI Guanzhou;HUANG Fan;WEN Huibo(Guangdong Dachao Expressway Company Limited,Meizhou,Guangdong 514000;China Merchants Chongqing Communications Technology Research and Design Institute Co.,Ltd.,Chongqing 400067)

机构地区：[1]广东大潮高速公路有限公司,广东梅州514000 [2]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《公路交通技术》2020年第5期11-17,共7页Technology of Highway and Transport

基　　金：广东省交通科技项目(科技-2017-02-005);新疆自治区支疆项目(2018E02075)。

摘　　要：为揭示花岗岩硬性结构面的剪切特性,采用混凝土材料模拟平直和不同粗糙度系数的硬性结构面,并进行直剪试验,通过从抗剪强度中分离摩擦分量及剪胀分量,对剪切过程中的剪切应力、剪胀特性进行了对比分析,揭示了平直结构面和不同粗糙度系数的花岗岩硬性结构面在不同法向压力作用下对峰值强度、峰现时间的影响机制。试验结果表明:花岗岩硬性结构面在剪切试验中,摩擦分量和剪胀分量都存在峰值之后降低的情况,剪胀分量的发展情况与结构面一阶凸起的抗剪力息息相关,而摩擦分量则随着剪切位移的变化与花岗岩硬性结构面二阶凸起的抗剪力的发挥过程关系密切。In order to reveal the shear characteristics of granite hard structural surfaces,concrete materials are used to simulate straight hard structural surfaces with different roughness coefficients,and direct shear tests are carried out.By the separation and analysis of the friction component and the dilatancy component from the shear strength,the shear stress and dilatancy characteristics in the shearing process are compared,andinfluencing mechanismofthe flat structure surface and the granite hard structure surface with different roughness coefficients underdifferent normal pressureon peak strength and peak appearance timeis revealed.The test results show that duringthe granite hard structural surface in the shear test,the friction component and the dilatancy component both decrease after the peak value.The development of the dilatancy component is closely related to the shear resistance of the first-order protrusion of the structural surface.The change of the friction component along with the shear displacement is closely related to the process of exerting the shear resistance of the second-order protrusions of the granite rigid structural surface.

关 键 词：花岗岩硬性结构面 剪切强度 剪胀特性 试验研究 

分 类 号：U416.14[交通运输工程—道路与铁道工程]