软弱土地层中超大型深基坑施工技术的应用

深基坑开挖及支护是城市地下工程施工的重要环节,深基坑工程的可控因素和不确定性因素甚多,施工前要考虑好诸多因素,应该根据不同区域的地况和水文地质情况采取深基坑支护技术,深基坑支护技术是提高工程安全系数的有效措施。文章结合实际工程项目,分析了超大型深基坑施工过程中的难点,在软弱土层中,需要对基坑开挖及支撑体系稳定性进行控制,项目采用三阶段开挖,并使用桩锚撑联合支护体系,取得了很好的施工效果。

The excavation and support of deep foundation pit is an important link in the construction of urban underground engineering.There are many controllable,as well as uncertain,factors in deep foundation pit engineering.Many factors should be considered before construction.Deep foundation pit support technology should be adopted according to different regional ground conditions and hydrogeological conditions.Deep foundation pit support technology is an effective measure to improve engineering safety factor.Based on the actual engineering project,this paper analyzes the difficulties in the construction process of super-large deep foundation pit.In the soft soil layer,it is necessary to control the excavation of foundation pit and the stability of support system.This project adopts three-stage excavation and uses pile-anchor combined support system,which has achieved good construction results.