摘要
为探究水-力耦合作用下泥质充填节理岩体剪切行为演化规律,以响洪甸水库F2断层岩体为研究对象,利用岩石三轴试验系统装置分别在0.4,0.7,1.0,1.3MPa围压下进行不同含水率充填节理岩体剪切试验,并对岩体节理破坏面和断层泥开展电镜扫描分析。结果表明:1)随着围压增加,泥质充填节理试样剪切强度均呈现增强趋势,且在高围压下剪切硬化行为更为显著;2)随着围压增加,低含水率试样(S1,w=10%)摩擦系数迅速提升,中含水率试样(S2,w=40%)摩擦系数增长速度较慢,高含水率试样(S3,w=70%)摩擦系数增长最为缓慢,出现“湿滑”特征:3)随着含水率增加(10%→40%→70%),内摩擦角呈非线性下降趋势(35°→8°→10°),黏聚力呈现先升后降特征(0.05→0.13→0.06MPa);4)对比S1和S3试样在1.3MPa前后形貌扫描数据可以发现,发生剪切滑移后断层表面粗糙度发生了显著变化,且低/高含水率断层泥岩石粒径的断层滑移行为存在明显差异;5)随着断层泥含水率增加,其微观结构由局部断层转变为整体断层。研究成果对水-力耦合作用下泥质充填节理岩体剪切行为演化规律具有一定的参考价值。
In order to explore the evolution law of shear behavior of filling argillaceous jointed rock mass under the action of hydro-mechanical coupling,taking the F2 fault rock mass of Xianghongdian reservoir as the research object,the rock triaxial test system device was used to carry out the shear test of filling jointed rock mass with different water content under the confining pressure of 0.4,0.7,1.0,1.3 MPa,and the joint failure surface and fault mud of rock mass were analyzed by electron microscope scanning.The results showed that:1)With the increase of confining pressure,the shear strength of clay-filled joint samples showed an increasing trend,and the shear hardening behavior was more significant under high confining pressure;2)With the increase of confining pressure,the friction coefficient of the low moisture content sample(S1,w=10%)increases rapidly,the friction coefficient of the medium moisture content sample(S2,w=40%)increased slowly,and the friction coefficient of the high moisture content sample(S3,w=70%)increased most slowly;3)With the increase of water content(10%→40%→70%)the internal friction angle showed a non-linear downward trend(35°→8°→10°),and the cohesion showed the characteristics of first increase and then decrease(0.05→0.13→0.06 MPa);4)Comparing the scanning data of S1 and S3 samples before and after 1.3 MPa,it could be found that the surface roughness of the fault had changed significantly after shear slip,and the fault slip behavior of rock particle size was obviously different due to the low/high water content fault gouge;5)Through scanning electron microscopy,it could be seen that with the increase of water content of fault gouge,the microstructure of fault gouge changed from local fault to overall fault.The research results had certain reference value for the evolution law of shear behavior of filling argillaceous jointed rock mass under hydraulic coupling.
作者
张今阳
罗居刚
王硕
ZHANG Jinyang;LUO Jugang;WANG Shuo(Anhui and Huaihe River Institute of Hydraulic Research,Hefei 230088,China;Anhui Provincial Key Laboratory of Water Science and Intelligent Water Conservancy,Hefei 230088,China;Anhui Construction Engineering Quality Supervision and Inspection Station Co.,Ltd.,Hefei 230088,China)
出处
《江淮水利科技》
2025年第6期1-8,14,共9页
Jianghuai Water Resources Science and Technology
基金
安徽省自然科学基金水联合基金项目(2308085US02)。
关键词
断层
充填节理
含水率
围压
剪切试验
微观结构
fault
filled joints
water content
confining pressure
shear test
microstructure
