含水量对细粒沉积岩力学性质及变形特性的影响研究  

Effect of Water Content on the Mechanical Characteristics and Deformation Properties of Fine-grained Sedimentary Rocks

作　　者：邹晨阳 陈芳[1,2] 叶霞 

机构地区：[1]江西省水利科学研究院,江西南昌330029 [2]江西省水工安全技术研究中心,江西南昌330029

出　　处：《水力发电》2018年第1期35-38,42,共5页Water Power

基　　金：江西省水利厅科技项目(KT201514;KT201516)

摘　　要：针对江西某泥岩高边坡存在滑坡隐患的问题,通过单轴压缩试验和回归分析,探讨了含水量对3种泥岩样本的力学性质和变形特性的影响规律,建立了泥岩抗压强度和弹性模量与含水量之间的相关关系。结果表明,随含水量的增加,泥岩单轴抗压强度和弹性模量迅速降低,降低速率受3种泥岩自身物质组成、结构和构造及固结程度等因素的影响;泥岩中的亲水性粘土矿物遇水软化,SiO_2中的硅氧双键水化断裂生成亲水性硅羟基,岩体裂隙表面有效应力因孔隙水压力增高而降低;含水量与泥岩的单轴抗压强度和弹性模量分别服从指数关系和线性关系。Regarding the instability problem of a steep mud sock slope in Jiangxi Province, the effect pattern and mechanism of water content on the mechanical characteristics and deformation properties of three different mud rocks are studied by uniaxial compression tests, and the correlation between water content and compressive strength and elastic modulus are established based on test data. The results indicate that： （a） the compressive strength and elastic modulus of mud rocks decrease rapidly with the increase of water content, meanwhile the decreasing rate is affected by the composition, texture and structure and the degree of consolidation of rock; （b） the hydrophilic clay minerals in mud rocks soften when encountering with water, the bond of SiO2 in rock cracks and generates hydrophilic silicon hydroxyl, the effective stress at rock fracture interface reduces due to increased pore water pressure; and （c） the relationship between water content and uniaxial compression strength subjects to exponential function while the relationship between water content and elastic modulus approximates to linear function.

关 键 词：岩石力学 单轴压缩试验 力学性质 变形特性 含水量 

分 类 号：TU458[建筑科学—岩土工程]