卸荷软土的应力路径及对强度影响的研究

软土基坑卸荷开挖,周围土体应力应变发生变化,导致土体结构损伤及工程性质变异,最重要是强度降低,这一影响对坑底土体尤其明显,土体扰动以后的强度才是抵抗基坑变形所能发挥出的真实强度值,而通过常规室内试验提供的基坑设计强度参数并不能很好地与这个值相吻合。这样给基坑设计与稳定性评估带来较大的误差,本文分析了这一现象的机理与规律。

Unloading Strength of Soft Clay Research

Results of excavation on soft clay foundation is the change of stress and strain of surrounding soil. Furthermore,soil structure breakage and its engineering property variance, and this effect is very obvious on bot- tom excavation soil.The article ex- plains this kind maehanization and regular pattern.To resist the excava- tion deformation is the disturbed soil , while not the natural state soil,but we choose the latter soil strength to design the sustaining structure.This difference will give high straggling of design and stability evaluation,and this article try to analyze the difference.