摘要
岩体中存在大量非贯通的节理。节理的几何尺寸、空间分布形式和连通率的大小等都是影响岩体强度的重要因素。本文用理论分析和实验测试的方法探讨了含有非贯通节理材料的力学强度特征和破坏机理。作者设计并制作了含有不同预制节理的水泥砂浆试件,完成了大量实验室力学试验,获得了试样剪切强度参数C、φ值与节理连通率的内在联系。在实验的基础上进一步用断裂力学理论,分析计算在不同连通率和法向应力作用下,节理发生初始扩展和峰值贯通破坏的条件,指出含节理材料发生破坏时,其尖端起裂角随着连通率的增大而变大,理论分析与实验结果一致性良好。
A large number of substantial discontinuous joints exist in rock mass which the mechanical strength will be controlled dramatically by the geornetrie dimension, the distribution in space and the connectivity rate of joints. In the paper, the strength features and failure mechanism of materials with discontinuous joints was discussed. A number of cement-sand samples with prefabricated joints had been originally designed and made, and a lot of mechanical tests had been completed in laboratory. Firstly, the relation between the shearing strength parameters C, φ and the joint＇ s connectivity rate was obtained. Secondly, based on the test results and the fracture theories, the initial conditions to make joints to start to open and the joints peak strength under different connectivity rates and normal stresses had been deduced. The theoretical analysis accords well with the test results.
出处
《西安科技大学学报》
CAS
北大核心
2009年第6期726-730,751,共6页
Journal of Xi’an University of Science and Technology
基金
973计划项目(2007CB209402)
关键词
预制节理
强度特性
连通率
破坏机理
prefabricated joints
strength feature
connectivity rate
failure mechanism
