弥勒高饱和原状膨胀土强度变形特性研究

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。

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

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 1-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.