风化锯齿形结构面抗剪强度特性及估算模型  

Study on Shear Strength Characteristics and Estimation Model ofWeathered Sawtooth Structural Plane

作　　者：廖军[1] 邓涛 唐刚 钱小龙 李镇 路军富[1] LIAO Jun;DENG Tao;TANG Gang;QIAN Xiaolong;LI Zhen;LU Junfu(College of Environment and Civil Engineering,Chengdu University of Technology,Sichuan,Chengdu 610059,China;Zigong City Construction Investment Development Group Co.,Ltd.,Sichuan,Zigong 643000,China)

机构地区：[1]成都理工大学环境与土木工程学院,四川成都610059 [2]自贡市城市建设投资开发集团有限公司,四川自贡643000

出　　处：《郑州大学学报（工学版）》2023年第6期112-118,共7页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(51978088)。

摘　　要：为研究风化程度对不同起伏角锯齿形结构面剪切强度、剪切变形等抗剪强度特性的影响规律,制作了起伏角分别为15°、25°、35°、45°的4种不同的灰岩规则锯齿形结构面,通过开展室内风化模拟试验制备不同风化程度的锯齿形结构面岩样,进行不同法向应力下的室内锯齿形结构面直剪试验,探究风化灰岩锯齿形结构面抗剪强度及其参数的变化规律。试验结果表明:锯齿形结构面剪切应力-剪切位移曲线表现为峰值剪断型,呈现先近似线性增加,达到峰值剪切应力后跌落,最后基本趋于稳定,保持一定的残余抗剪强度的趋势;随着风化程度的增加,灰岩锯齿形结构面抗剪强度呈现减小的趋势,其抗剪强度参数发生不同程度的劣化,黏聚力的劣化程度大于摩擦角,而结构面起伏角大小与抗剪强度之间呈现正相关;基于模型试验结果,建立了风化锯齿形结构面抗剪强度估算模型,揭示结构面抗剪强度与风化程度及起伏角的定量化关系。In order to study the influence of weathering degree on the shear strength characteristics such as shear strength and shear deformation of sawtooth structural planes with different undulating angles,four kinds of regular sawtooth structural planes with undulating angles of 15°,25°,35°and 45°were made.The rock samples with different weathering degrees were prepared by indoor weathering simulation test,and the direct shear test of indoor structural plane under different normal stresses was carried out to explore the variation law of shear strength and parameters of limestone sawtooth structural plane.The test results showed that shear stress-shear displacement curve of serrated structural plane showed peak shear type,which increased approximately linearly at first,then decreased after reaching the peak shear stress,and finally tended to be stable and maintained a certain residual shear strength.With the increase of weathering degree,the shear strength of limestone sawtooth structural plane showed a decreasing trend,and the shear strength parameters had different degrees of deterioration,and the deterioration degree of cohesion was greater than that of friction angle,while the fluctuation angle of structural plane was positively correlated with the shear strength.Based on the model test results,the shear strength estimation model of weathered sawtooth structural plane was established to reveal the quantitative relationship between shear strength and weathering degree and fluctuation angle.

关 键 词：灰岩 锯齿形结构面 风化程度 抗剪强度 估算模型 

分 类 号：TU452[建筑科学—岩土工程]