可控刚度桩筏基础在岩溶地区的工程实践

Engineering practice of controllable rigidity pile raft foundation in karst area

在岩溶地区建筑物设计过程中,由于工程地质条件复杂,常采用摩擦桩与端承桩共同作用的桩筏基础形式,当建筑物层数较高,上部荷载的增大导致传统桩筏基础面临承载力不足和差异沉降过大等问题。以典型工程为例,介绍了可控刚度桩筏基础的设计方案,充分利用了地基土承载力。采用有限元建模的方法,从筏板沉降、筏板应力、桩顶反力等方面对传统桩筏基础和可控刚度桩筏基础设计方案进行了对比分析,验证了可控刚度桩筏基础用于该工程的优越性。本项目对同类工程有很好的借鉴作用。

In the process of building design in karst area,due to the complex engineering geological conditions,the pile raft foundation with friction pile and end bearing pile is often used. When the number of floors of the building is high,the increase of the upper load causes the traditional pile raft foundation to face the problems of insufficient bearing capacity and excessive differential settlement. Taking a typical project as an example,the design scheme of pile raft foundation with controllable rigidity is introduced,which makes full use of the bearing capacity of foundation soil. By using the finite element modeling method,the design schemes of traditional pile raft foundation and controllable rigidity pile raft foundation are compared and analyzed from raft settlement,raft stress and pile top reaction. The superiority of the pile raft foundation with controllable rigidity is verified. This project has a good reference for similar projects.