【摘要】 为揭示非饱和土的强度特征和吸力作用机理,根据水气状态和联通特点对非饱和土进行了重新分类。在此基础上,基于球形颗粒数学上的理想排列方式建立了理想非饱和土模型的强度准则。该强度模型以莫尔—库仑准则为基础,与理想排列方式不同饱和阶段的强度特征匹配良好。考虑土颗粒并不是大小一致的球形,且颗粒的级配具有多样性和复杂性等特点后,建立了以基质吸力为参数的连续可导的强度公式,并进一步给出了与非饱和性相关的吸力摩擦角及其发展规律。研究表明,吸力摩擦角随吸力的增加而增加并逐渐趋近于其渐近线。更多还原

【Abstract】 In order to discover strength character and suction effect,unsaturated soils are reclassified according to water & air state and connectivity features.Furthermore,the strength model of ideal unsaturated soils is established based on ideal spherical particles arranged in a particular way. It bases on the Mohr Coulomb criterion and corresponds to the various stages of saturation for ideal unsaturated soils,Considering the nonuniformity of the actual soil particle size,the irregularities of particle shape,the diversity of the particle size distribution and the complexity of the particle mineralcomposition,a continuous and differentiable strength equation of unsaturated soils is set up with matric suction as parameters. And further,the suction friction angle that is related to unsaturated characteristics and its law of development are given. The researchers indicated that suction friction angle increases with the increase of the suction and gradually approaches its horizontal asymptote.更多还原