软粘土冻土挡墙蠕变特征及其设计

本文介绍上海淤泥质粘土冻土力学特性,通过淤泥质粘土大型平面冻土墙模拟试验,分析了平面冻土墙的变形场及其最大变形与各影响因素的关系,并获得其经验公式;研究认为冻土墙最大变形发生在墙中部顶端,影响冻土墙变形程度的因素依次为土压力、冻土墙温度、基坑深度、墙跨及培厚、暴露时间;并讨论了冻土挡墙的设计方法.

CREEP PROPERTY AND DESIGN OF FROZEN SOFT CLAY WALL

In this paper, the mechanical properties of frozen soft clay in Shanghai have been studied. The deformation field and the relation between maximum deformation and each of its affecting factors are analysed by simulation tests of large plane frozen soft clay walls. And an empirical equation is also obtained. The maximum deformation takes place at the top of frozen wall in the middle span. The factors affecting deformation are soil pressure, wall average temperature, foundation pit depth, wall span, wall thickness and exposure time in turn. Finnaly, the method of designing frozen wall as presented.