基于不同密度与含水率下的砂卵石强度参数研究

砂卵石土在我国大量分布,然而砂卵石土的颗粒离散性以及卵石几何分布的随机性使得其力学特性异常复杂。为反映其在不同应力状态下的变形强度特性,通过室内大型三轴试验,对不同含水率和密度的砂卵石土进行研究。试验结果表明:1不同含水率和密度的砂卵石土的应力应变关系表现为应变硬化型,随着围压的增大,砂卵石土的初始模量变大;2含水率相同时,砂卵石土的密度越大其内摩擦角越大,黏聚力越大;3砂卵石土的内摩擦角与黏聚力随着含水率的变化呈二次抛物线型变化,并且均有突变现象,内摩擦角在含水率为6%左右时最小,黏聚力则最大。

Study on Strength Parameter of Sandy Pebble Soil Based on Different Density and Moisture Content

Sandy pebble soil has been applied widely in our country, however , it demonstrates a very complicated dynamic behaviour due to discreteness of gravels and random geometrical distribution. In order to study the dynamic characteristics of deformation and strength under complex stress conditions, the characteristics of sandy pebble soils with different moisture content and densities are studied by large-scale triaxial tests in laboratory. Results show that: (1) Stress-strain relationship of sandy pebble soil with different moisture content and density are classified into harden type, and initial modulus of sandy pebble soils increases with the accretion of consolidation ratio; (2) Under the same moisture content ,with the increase of density, angle of internal friction and cohesion force is greater; (3) With the change of moisture ,angles of internal friction and cohensive force of sandy pebble soils will have a mutational phenomenon. Moreover, when moisture content is 6 degree, the angle of internal friction is minimum and cohesion force is maximum.