双荷载共同作用下土体变形影响机理及计算方法

发布时间：2018-10-08 15:31

【摘要】：在明确给出化学荷载定义及其表征变量的基础上,考虑力学荷载的共同作用,将土体的变形分为由力学荷载引起的力学固结变形以及由化学荷载引起的化学-渗透固结变形.提出了化学和力学双荷载共同作用下考虑化-力耦合的土体变形计算方法,并从微细观作用机理角度,分析了双荷载作用下土体变形影响机理.推导了宏观孔隙体积变化量的计算公式,在此基础上结合室内渗透试验结果对2种荷载共同作用下土体的变形开展了定量化分析.结果表明,化学物的存在会引起土体发生固结变形,但土体宏观孔隙体积却并非一定减小.由于吸附水解吸到宏观孔隙空间中,也可能造成孔隙通道变宽,孔隙比增大.
[Abstract]:Based on the definition of chemical load and its representation variables, the deformation of soil is divided into mechanical consolidation deformation caused by mechanical load and chemical-osmotic consolidation deformation caused by chemical load, considering the joint action of mechanical load. A soil deformation calculation method considering the coupling of chemical and mechanical loads is proposed, and the mechanism of soil deformation under double loads is analyzed from the view of microcosmic mechanism. The calculation formula of macro pore volume variation is derived, and the quantitative analysis of soil deformation under two kinds of loads is carried out on the basis of the results of indoor permeation test. The results show that the existence of chemicals will cause consolidation deformation of soil, but the macro pore volume of soil is not necessarily reduced. Due to the desorption of water into the macro pore space, the pore channel may also become wider and the void ratio will increase.
【作者单位】：北京工业大学城市与工程安全减灾省部共建教育部重点实验室;
【基金】：国家自然科学基金面上资助项目(51378035)
【分类号】：TU43

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