不同注浆材料作用下结构面剪切力学特性研究  

Study on shear mechanical properties of structural planes grouted with different materials

作　　者：卢海峰[1,2] 朱晨东[1] 刘泉声 LU Haifeng;ZHU Chendong;LIU Quansheng(School of Civil Engineering,Wuhan University,Wuhan,Hubei 430072,China;Key Laboratory,of Geotechnical and Structural Safety Engineering of Hubei Province,Wuhan University,Wuhan,Hubei 430072,China)

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072 [2]武汉大学岩土与结构工程安全湖北省重点实验室,湖北武汉430072

出　　处：《岩石力学与工程学报》2021年第9期1803-1811,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(41941018,51974203)。

摘　　要：注浆技术是裂隙岩体常用加固方法,其对岩体的作用主要体现在对结构面力学特性的影响,不同注浆材料加固效果和作用机制不同。以红砂岩为研究对象,通过劈裂法制取结构面,选取水泥、环氧树脂进行结构面注浆,开展不同法向压力下的直剪试验,并与未注浆结构面剪切试验结果进行比较,对其剪切力学特性进行分析。利用三维扫描仪,对剪切前后的结构面进行扫描,以有效剪切倾角、结构表面三维形貌的起伏度坡度均方根Z2的计算公式为理论基础,利用分析软件对剪切前后的结构面进行粗糙度评价,分析注浆对于结构面三维形貌特征的影响。试验结果表明:注浆可以增大结构面间的黏聚力,同时改变结构面的三维形貌特征,使得抗剪强度增大;不同注浆材料表现的力学特性有所不同,环氧树脂注浆材料对结构面加固效果突出,水泥注浆材料在低法向应力水平下效果较为明显。Grouting technology is a common reinforcement method for fractured rock mass.Grouting effect on rock mass is mainly reflected in the influence on mechanical properties of structural planes,and different grouting materials have different reinforcement effects and mechanisms.Taking red sandstone as the research object,the structural plane is made by splitting method,and the cement and the epoxy resin are selected for grouting materials.The direct shear tests under different normal pressures are carried out.The shear test results are compared with those of non grouting structural planes,and the shear mechanical properties are analyzed.The 3 D scanner is used to scan the structural planes before and after shearing.Based on the calculation formula of the effective shearing angle and the root mean square slope Z2,the roughness of the structural planes before and after shearing is evaluated by using the analysis software,and the influence of grouting on the three-dimensional morphological characteristics of the structural planes is analyzed.The test results show that grouting can increase the cohesion between the structural planes,and change the three-dimensional morphology of the structural planes,so as to increase the shear strength.It is also shown that the mechanical properties of different grouting materials are different.Epoxy grouting material has a prominent effect on structural plane reinforcement,while cement grouting material has a significant effect at low normal stress level.

关 键 词：岩石力学 注浆加固 注浆材料 剪切特性 节理岩石 

分 类 号：TU45[建筑科学—岩土工程]