单裂隙砂砾岩体变形规律研究  

Study on the deformation law of calcirudite rock mass with a single fracture

作　　者：刘光廷[1] 叶源新[1] 胡昱[1] 李鹏辉[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水力发电学报》2007年第5期25-30,共6页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金;二滩水电开发有限责任公司雅砻江水电开发联合研究基金(50539020)

摘　　要：本文利用双轴徐变试验机,对单裂隙砂砾岩体开展了一系列双轴加载试验研究,得到裂隙变形的初步规律。法向加载下裂隙面闭合且塑性明显,侧向加载下裂隙面张开;法向和侧向同时加载时,裂隙面的变形由法向应力与侧向应力共同决定,且法向应力对裂隙面的变形影响明显大于侧向应力。建立了可以反映裂隙岩体变形的各向异性特性与多轴加载效应的单裂隙砂砾岩体二维本构关系式。假设裂隙平面内对称的两对侧向应力作用效果等效并可以叠加,把二维本构关系推广到三维。Through the biaxial creep machine, a series of biaxial experiments on calcirudite rock mass with a single fracture are carried out and preliminary deformation laws of the fracture are achieved. This research shows that the fracture closes under normal loading with marked plasticity while opens under the lateral. When the fracture is loaded with normal stress and lateral stress at the same time, how the fracture will grow that depends on the both and the normal one affects much more than the lateral one. 2-D constitutive equation for rock mass with a single fracture is devised, which considers the characteristic of deformation under anisotropic and multiaxial loading. As the two pairs of lateral stresses are plane symmetric and play the same role and could be superposed, thus the 2-D constitutive equation may be extended to 3-D.

关 键 词：岩土力学 变形规律 双轴试验 砂砾岩 单裂隙 三维 

分 类 号：TU45[建筑科学—岩土工程]