黏性土桩锚基坑冻胀模型试验及其响应分析

黏性土地区基坑的冻胀效应对于工程施工和支护方案设计影响至关重要.结合东北某基坑工程,现场取样,利用室内模型相似试验,得出了黏性土地区桩锚基坑冻胀的力学变形规律,以及冻土压力与位移的函数关系,在此基础上引入支护结构协调变形方程,应用有限差分原理,考虑桩土相互作用,得出冻胀桩锚基坑支护体系的计算结果.基坑冻胀实例表明,桩锚体系考虑冻胀力影响的基坑施加冻胀作用的计算方法,更接近工程监测实际情况,可以在类似工程中推广应用.

Frost Heaving Model Test and Response Analysis of Pile-Anchor Foundation Pit in Cohesive Soil Area

Frost heaving effect of foundation pit in cohesive soil has a significant impact on engineering construction and support design. Based on selected foundation pit in Northeast China， mechanical deformation law of pile-anchor foundation pit in cohesive soil and the relationship between frozen earth pressure and displacement are derived through a series of laboratory experiments. Deformation-compatibility equations of supporting structure are introduced using the finite difference method considering soil-pile interaction， so that supporting system of the frost heaving pile-anchor foundation pit can be quantitatively designed. The case of the frost heaving effect on foundation pit offers a new method for anchor-pile system under the consideration of frost heaving action imposed by foundation pit with the influence of frost heaving pressure， which is more accurate to the actual condition of engineering monitoring， and can be applied to similar projects.