土钉墙与桩锚组合支护结构研究

Deep Excavation Supports with the Combination of Soil Nailed Wall and Ground Anchor

近年来,基坑支护逐渐从单一结构向多种结构联合支护方向发展。工程实践中,为实现技术、经济与环境安全等控制目标,常采用上部土钉墙结构、下部桩锚结构的联合支护形式。以土钉墙与桩锚联合支护结构为研究对象,结合邢台市某深大基坑设计的工程实例,运用提出的计算方法进行验证,并通过现场变形观测。结果表明,土钉墙与桩锚支护结构组合应用的效果非常明显,地表沉降量显著减小,且计算结果与实际变形一致。

The trend of the deep excavation support is turning from the single method to a combination of different methods.In the engineering practice,meeting the objective of the cost effective,technical feasibility,and environmental safety leads to the new combination of deep excavation support：soil nailed wall for the upper support and the ground anchor for the lower portion of excavation support.This paper present a deep excavation case history in Xingtai City.The combination of soil nailed wall and the ground anchor method is proved to be very effective,the ground subsidence is smaller than that of the similar excavation elsewhere.The computed settlement results are consistent with the observed values.