粗粒土路基的力学特性试验研究

Research on Mechanical Characteristic of Coarse Grained Soil Subgrade

以实际工程为依托,通过室内大型三轴试验研究了巨粒土的剪切特性。结果表明,水对巨粒土的剪切特性有重要影响;应力~应变曲线表现为弱应变软化型或应变硬化型,其形态主要取决于围压的大小;粗粒土具有明显的剪胀和剪缩特性,抗剪强度随着应力水平变化,呈现出非线性特征。

Depending on the practical projects, large-sized triaxial tests were carried out in lab in order to study the shear characteristics of the coarse grained soils. According to the test results, firstly, water has important influence to the compression and shear characteristics of massive grain soils. Secondly, the pattern of stress-strain curve is mainly weak strain-softening or strain-hardening style. And the patterns were determined by the around confining press. Finally, the coarse grained soils possess characteristics of shearing expand and shearing compression. And the shearing strength has nonlinear characteristics and varies with the strain level.