摘要
岩质边坡的动力响应在很大程度上受到节理面的制约,研究节理面的动力剪切特性是进行岩质边坡动力反应分析的重要前提。为了探究节理岩体在不同动态剪切速率下的剪切力学行为,本文将在应力应变控制式三轴剪切渗透试验仪上对两种不同粗糙度的白砂岩节理试件开展剪切试验,施加的剪切速率分别为0.6 mm/min、1.8 mm/min、5.4 mm/min、10.8 mm/min。根据直剪试验结果对不同剪切速率以及不同粗糙度节理面的峰值抗剪强度及剪胀角进行分析。此外,本文从细观角度构建静态抗剪强度模型,在此模型的基础上基于试验数据,提出一种考虑剪切速率的动态抗剪强度模型。
The dynamic Pre-requisite of rock slope is restricted by the joint surface to a great extent.The research on dynamic shear characteristics of joint surface is an important Pre-requisite for dynamic response analysis of rock slope.In order to explore the shear mechanical behavior of jointed rock mass under different dynamic shear rates,the shear tests of two kinds of white sandstone joints with different roughness were carried out on the stress-strain controlled triaxle shear permeability tester.The shear rates are 0.6 mm/min,1.8 mm/min,5.4 mm/min and 10.8 mm/min respectively.According to the results of direct shear test,the peak shear strength and dilatancy angle of joint surfaces with different shear rates and roughness were analyzed.In addition,a static shear strength model from the micro perspective was proposed,and based on the test data,a dynamic shear strength model considering shear rate was put forward in this paper.
作者
张雨辰
程浩
ZHANG Yuchen;CHENG Hao(School of Civil Engineering,Wuhan University,Wuhan 430072,China)
出处
《粉煤灰综合利用》
CAS
2021年第2期36-42,共7页
Fly Ash Comprehensive Utilization
基金
国家自然科学基金重点项目(51809198)。
关键词
剪切速率
剪切特性
峰值抗剪强度模型
剪胀
shear rate
shear characteristics
model of peak shear strength
dilatancy
