弥勒高饱和原状膨胀土强度变形特性研究  

Study on Strength and Deformation Characteristics of Intact Expensive Soil with High Saturation in Mile Region

作　　者：李井元[1] 陈伟志[1] 李安洪[1] 蒋关鲁[2] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]西南交通大学土木工程学院,成都610031

出　　处：《路基工程》2018年第1期84-89,共6页Subgrade Engineering

基　　金：铁道部科技研究开发计划项目:低压缩性土及膨胀土地基无砟轨道沉降控制深化研究(2010G003-F)

摘　　要：结合云桂高速铁路建设,采集不同深度高饱和原状膨胀土,开展膨胀土的固结排水三轴试验和一维固结试验,研究了原状膨胀土的抗剪强度及压缩变形特性。结果表明:原状膨胀土的抗剪强度随蒙脱石含量、初始孔隙比的增加而递减。膨胀土压缩系数与固结压力具有负指数变化关系,地基中不同深度膨胀土的压缩系数具有"归一化"性状。在一定压力范围内,原状膨胀土的应力-应变关系可用幂函数模型描述。In relation to the construction of YUNGUI High-speed Railway, the intact expansive soil with high saturation in different depth was sampled, then consolidated-drained triaxial test and I-D consolidation test were carried out to study the shear strength and compression deformation characteristics. The result shows that intact expansive soil＇s shear strength decreases as the montmorillonite content and the initial void ratio increases; the relation between the compressibility coefficient thereof and the consolidation pressure presents negative exponential change ; the compressibility coefficient of expansive soil in different depth of foundation is of normalization; and within a certain pressure range, the stress-strain relation of intact expansive soil may be represented by power function model.

关 键 词：原状膨胀土 高饱和 抗剪强度 压缩特性 幂函数模型 

分 类 号：TU411.7[建筑科学—岩土工程]