土岩组合深基坑稳定性分析及支护研究

Stability Analysis and Support Research of Soil-rock Composite Deep Foundation Pit

在地质条件复杂的区域,土岩组合深基坑工程的稳定性关乎工程质量,需进行重点研究,鉴于此,本文通过深入分析土岩组合深基坑的稳定性问题和支护技术,探讨了不同土岩边坡破坏模式和支护结构方案的适用性。通过对某基坑工程的侧向土压力、岩石压力及土岩组合侧向岩土压力的计算分析,对比分析了“单排桩+预应力锚索”和“上部锚杆挡墙+下部双排桩”两种支护方案,结果表明,对于具有中层岩体的土岩组合地质条件,“上部锚杆挡墙+下部双排桩”支护能够提供更佳的稳定性。

In the area with complex geological conditions,the stability of soil-rock combined deep foundation pit engineering is related to the quality of the project,which needs to be studied emphatically.In view of this,this paper deeply analyzes the stability and supporting technology of soil-rock combined deep foundation pit,and discusses the applicability of different soil-rock slope failure modes and supporting structure schemes.Based on the calculation and analysis of lateral earth pressure,rock pressure and lateral rock-soil pressure of a foundation pit project,two supporting schemes of'single row pile+prestressed anchor cable'and'upper anchor retaining wall+lower double row pile'are compared and analyzed.The results show that for the geological conditions of soil-rock combination with middle rock mass,the support of'upper anchor retaining wall+lower double row pile'can provide better stability.