不同粗糙度结构面试件剪切试验特性研究

Study on the Shear Test Properties of Different Structural Plane Roughness

结构面岩体的破坏以剪切破坏为主。结构面的抗剪强度是结构面最主要的力学性质,也是影响工程岩体稳定性的决定性因素之一。本文选择JRC标准剖面线中的5条具有代表性的剖面线,利用水泥砂浆制成不同粗糙度的结构面试件,在不同法向应力作用下进行剪切试验,对其力学特性进行基础性研究,阐述不同粗糙度结构面在剪切条件下力学特性的主要特征及其强度、变形等力学特性的主要规律。通过对试验数据的分析,对结构面综合抗剪强度参数在剪切条件下的变化规律进行研究,建立评价结构面剪切强度的经验公式,同时探讨了结构面在剪切力作用下的剪切变形曲线以及不同粗糙度结构面的剪切变形特性。

The main destruction of structural plane of rock mass is shear failure. The shear strength is the most important mechanical property of structural plane and also it plays a decisive role in affecting the stability of engineering rock mass.This thesis picks up the five most representative section lines from the JRC standard section lines. By utilizing the structural plane test-piece of different structural plane roughness, and which is made of cement mortar, it conducts shear test under the effect of different normal stress. This thesis aims to precede basic research of its mechanical property and elaborate the key features of mechanical property of structural plane of different roughness under the condition of shear and the main rules concerning mechanical property including its strength and deformation. Through the analysis of test data, the research on varying rules of comprehensive shear strength parameter under the condition of shear is made, and it establishes the empirical formula on evaluating the shear strength of structural plane. Meanwhile, it tries to discuss shear deformation curve of structural plane under the effect of shear force and shear deformation characteristics of structural plane of different roughness.