考虑桩土耦合作用的挤密桩地基的变形及稳定性研究

Study of deformation and stability of compaction pile foundation on pile-soil interaction

建筑结构大型化带来了许多新的问题,如沉降不合理会引起的建筑倾斜、倒塌以及附属构件的破坏,安全系数较低保证不了此类特种结构必要的安全储备等。因此针对于此类特种结构提出一种接近工程实际受力行为的计算方法迫在眉睫。本文以庆阳某建筑挤密桩地基为背景,将工程中庞大的布桩形式进行处理简化处理。通过变形及稳定性求解,得到最大沉降值小于规范规定的值,安全系数大于一般工程要求。并且运用理论公式计算了复合地基的最大沉降值,从而验证了计算的合理性,为今后工程结构安全性的评价提供了新思路。

With buildings become larger,it brings a lot of new problems,such as building＇s tilt,collapse and accessory component damage caused by unreasonable settlement,lower safety coefficient can not ensure the necessary safety reserve of this special structure and so on.Therefore,it is urgent to put forward a calculation method for this special structure which is close to practical engineering mechanical behavior.This article took foundation treated with compaction piles of Qingyang depot as the background and simplified the arrangement piles as a model piles and soil between piles interval to arranged.Through the solution of deformation and stability,it get the maximum subsidence value which is smaller than the stipulated value in the specification and the provisions that safety factor is greater than the general safety factor.The maximum settlement of composite foundation is calculated by using the theoretical formula,the displacement value calculated by theory is close to settlement value.A new finite element method is proposed and it provides a new idea for the reasonable safety evaluation of the engineering structure.