含水状态对白云岩剪切特性影响规律的试验研究  

Experimental Study on Influence of Moisture Content on Shear Property of Dolomite

作　　者：郑东普[1,2] 李克钢[1,3] 吴勇 

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]邢台市建设工程质量检测中心,河北邢台市054000 [3]重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400044 [4]云南建筑科学研究院,云南昆明650223

出　　处：《矿业研究与开发》2013年第4期20-23,51,共5页Mining Research and Development

基　　金：国家自然科学基金资助项目(41202229);云南省自然科学基金项目(2009ZC020M);高等学校重点实验室访问学者基金项目

摘　　要：对不同含水状态下的白云岩进行了直接剪切试验,得到了各组岩石的剪切强度曲线及剪切应力-位移曲线。基于得到的试验数据,深入分析了含水率对岩石抗剪强度、剪切参数、变形特性以及破坏方式的影响规律。结果表明:随着含水率的增加,岩石抗剪强度相应降低,且法向应力越大,水对抗剪强度的弱化作用越明显;粘聚力和内摩擦角与含水率之间具有明显的负指数函数关系,相比粘聚力,岩石内摩擦角对水的反应要更为敏感,在此基础上,给出了考虑含水率影响的抗剪强度求解公式;岩石剪切位移随含水率的增加而增大,而且含水率的变化还会对岩石的剪切破坏形式产生影响,随着含水率的逐步增大,岩石表现出由脆性向延性破坏的转化特征。试验成果对工程建设和岩石理论研究具有一定的参考价值。The direct shear test of dolomite with different mois- ture content was carried out, and some curves of shear strength and shear stress-shear displacement were obtained.Based on the test data, the effect law of dolomite ＂s moisture content on its shear strength, shear parameter, deformation properties and fail-ure mode were analyzed.The tested results showed that： with the increase of moisture content the shear strength decreased, and greater normal stress was, more obvious the weakening effect of water on was; there were relationships of negative exponential function between dolomite＇s moisture content and its cohesion or internal friction angle, comparing with the cohesion, the internal friction angle was more sensitive to water, based on those results, a calculation formula of shear strength was proposed, which con- siders the effect of moisture content; the shear strength increased with the increase of moisture content, and the change of moisture content had influence on the shear failure mode of rock, with the increasing of the moisture content, the rock damage transformed from the ductility to brittle features. The results of experiment have a certain referential value to construction project and theo- retical study on rock.

关 键 词：白云岩 含水率 剪切特性 破坏方式 

分 类 号：TD315[矿业工程—矿井建设]