荷载-水化耦合下红层泥岩的变形特性  

Deformation of Red Mudstone under Loading and Water-Rock Interaction

作　　者：张志敏[1,2] 高文华[1,2] 张宗堂[1,2] ZHANG Zhi-min;GAO Wen-hua;ZHANG Zong-tang(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室,湖南湘潭411201

出　　处：《长江科学院院报》2019年第6期68-72,共5页Journal of Changjiang River Scientific Research Institute

基　　金：湖南省教育厅重点科研资助项目(16A073);湖南省教育厅资助项目(10C0669);国家自然科学基金项目(51774132);湖南科技大学博士科研启动基金项目(E51954)

摘　　要：红层泥岩是一种常见的软岩,广泛分布于我国的西南、西北、华中及华南地区。水对红层泥岩的力学特性影响显著,由于降雨因素的影响,红层泥岩地区的边坡频频爆发崩塌、滑坡等工程事故。为模拟红层泥岩地区经历极端干燥天气后突降暴雨,即红层泥岩在不同荷载水平作用下从干燥状态到饱和状态水化作用的全过程,研究红层泥岩在不同荷载水平作用下遇水水化后的变形和强度特征,设计了一个简单试验装置和试验方案,实现了对红层泥岩在荷载-水化耦合作用下的变形特性研究。试验结果表明:①红层泥岩的水化作用明显,红层泥岩的饱和单轴抗压强度远低于干燥岩样的单轴抗压强度,考虑荷载作用下的干燥红层泥岩水化破坏应力水平又远低于泥岩的饱和强度;②破坏是一个渐变的过程,在某一应力水平作用下岩石的变形经历了一个从缓慢增长到急剧增长的过程,但岩样的破坏具有突然性,泥岩破坏后呈泥状。成果可为红层泥岩地区的工程稳定性研究提供一定的参考。Red mudstone, a common soft rock, is widely distributed in southwest, northwest, central and southern China. As the mechanical properties of red mudstone degrades remarkably under the action of water, engineering accidents inclusive of collapses and landslides occur frequently in red mudstone area under the influence of rainfall. A simple test apparatus and test scheme was designed in the present research to investigate the deformation and strength features of red mudstone under the combined action of loading and hydration. The holistic process of red mudstone encountering sudden rainfall after extreme drought undergone dry state and saturation under different load levels were simulated. The conclusions are presented as follows:(1) the uniaxial compressive strength of water-saturated red mudstone was considerably lower than that of dry red mudstone, implying an evident hydration effect;while the stress level failure of dry red mudstone under the action of water lagged far behind the strength of saturated red mudstone.(2) Despite that the deformation of rock specimen experienced a progressive process from gentle development to dramatic surge under a certain stress level, the failure of specimen happened abruptly and instantly, and after failure, the specimen was in a muddy state.

关 键 词：红层泥岩 变形特性 水化作用 荷载 软化系数 脆性破坏 

分 类 号：TU45[建筑科学—岩土工程]