基于膨胀力作用在膨胀土基坑支护设计中的应用研究

在成都地区膨胀土基坑支护设计时,考虑到膨胀土的胀缩影响,对膨胀土的抗剪强度参数进行大幅度的折减,且没有考虑膨胀土的力学性质对支护体系的作用。基于结构体系分析,提出将膨胀力等效为水平集中力作用于支护结构的计算方法,并与成都地区某膨胀土基坑支护设计实例对照,为膨胀土基坑支护设计提供一种新的计算方法。

Design research based on expansion force acting on expansive soil excavation

When designed expansive soil excavation in Chengdu,taking into account effects of expansion and contraction of expansive soils,substantial reduction for the parameters of shear strength of expansive soil,but without considering the mechanical properties of expansive soil on the role of supporting system. Based on architecture analysis,proposed calculation method on the expansion force is equivalent to the level of concentration of force which applied to the calculation of the supporting structure,and controlled with a design example of expansive soil excavation of the Chengdu area,provided a new calculation method for designed expansive soil excavation.