护坡桩+微型钢管桩复合土钉墙联合支护体系研究应用

Combined supporting system of the slope protection pile and the compound soil nail wall with micro steel pipe piles

摘要:

本文提出了一种新的联合支护体系——护坡桩+微型钢管桩复合土钉墙支护体系，成功解决了基坑周边无放坡空间需垂直开挖、基坑深度大、要求位移小、支护费用高等技术难题，做到了施工便利，对控制边坡位移变形、增强边坡整体稳定性、保证在基坑开挖工程中不发生对周围环境的影响具有良好的作用。采用这种支护方式对北京一工程进行设计施工探讨，经工后监测效果良好，大大地提高了边坡的安全稳定性，从而验证了这一支护形式的可行性，其在深基坑支护中具有常规土钉墙和护坡桩无法相比的技术与经济优势，可供其他类似工程参考，具有较高的适用推广价值。

Abstract:

This article proposes a new combined supporting system—the slope protection pile and the compound soil nail wall with micro steel pipe piles， which successfully solved the technical difficulties such as necessity of vertical excavation around the foundation pit due to no grading space， great depth of the foundation pit， requirement for small displacement， and high support costs. In addition， the system provided convenient construction， and was beneficial to control of the displacement and deformation of the slope， and enhancement of the overall stability of the slope without impact on the surrounding environment during the excavation of the foundation pit. The design and construction with this support method was tested for a project in Beijing， and the monitoring results were good with great improvement in the safety and stability of the slope； thus， verifying the feasibility of the support form. It has technical and economic advantages that conventional soil nail walls and slope protection piles cannot compare to in deep foundation pit support. It can be used as a reference for other similar projects， and has high application and promotion value.