饱和度及收缩变形对土体小应变刚度特性的影响#br#

doi:10.13722/j.cnki.jrme.2019.0844

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摘要饱和度影响下的浅表层土体小应变刚度与泊松比是预测土与结构物相互作用引起变形的关键参数。基于自主设计的试验装置，针对细粒土(黏土和粉土)通过蒸汽平衡法控制环境湿度，开展了无外荷载作用下土体饱和度变化对小应变刚度及泊松比影响的试验研究。试验结果表明：细粒土弹性波速及小应变刚度随饱和度演化均可分为3个阶段，即边界效应阶段、过渡阶段及残余阶段。压缩波速及小应变体积模量随饱和度的降低先减小后增加，剪切波速及小应变剪切模量随饱和度的降低逐渐增加，黏土的泊松比随饱和度的降低呈线性减小，粉土的泊松比在饱和度低于85%后无明显变化，仅在0.37附近波动，与粉土相比，黏土的小应变刚度特性及泊松比受饱和度影响更为显著。

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关键词 ：土力学, 收缩变形, 饱和度, 弹性波速, 小应变刚度, 泊松比

Abstract：The small strain stiffness and Poisson's ratio of soils，closely related to the degree of saturation of the soil，play a key role on predicting the structure deformation caused by the interaction between soil and structure on the shallow surface. Adopting the experimental instrumentation developed independently，experimental investigations on soil cakes were conducted to explore the dependencies of the small strain stiffness and Poisson's ratio of fine-grained soils on the evolution of degree of saturation which is induced by adjusting environmental humidity under zero external load. The experimental results show that evolution of both the elastic wave velocity and small strain stiffness of fine-grained soils with the degree of saturation can be identified three characteristic stages including boundary effect stage，transition stage and residual stage. With decreasing the degree of saturation，the compression wave velocity and bulk modulus first decrease and then increase，the shear wave velocity and shear modulus increase，while the Poisson's ratio of the clay decreases linearly. In contrast，the Poisson¢s ratio of the silty clay changes limitedly and keeps in the value of 0.37 when the degree of saturation is lower than 85%. It is shown that the degree of saturation plays a more important role on the change of the small strain stiffness and Poisson¢s ratio of clay than on that of silts.

Key words： soil mechanics shrinkage deformation degree of saturation elastic wave velocity small strain stiffness Poisson¢ s ratio

引用本文:

陶帅1，2，韦昌富1，2，陈盼1，2. 饱和度及收缩变形对土体小应变刚度特性的影响#br#[J]. 岩石力学与工程学报, 2020, 39(5): 1023-1031.
TAO Shuai1，2，WEI Changfu1，2，CHEN Pan1，2. The effect of saturation and shrinkage deformation on the small strain stiffness of soils#br#. , 2020, 39(5): 1023-1031.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0844 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I5/1023

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