位移监测在深基坑支护施工中的应用分析

摘要

Since the safety of the retaining for excavation is reflected to a certain extent by the displace-ment of the soil around the excavation,it is therefore very important to monitor the change during the risky process of earthwork excavation. A protection program of bored piles with two reinforced concrete girders is developed in this paper according to the actual geological and hydrological conditions of the project. The dynamic change of the displacement is analyzed with the data collected in the earthwork excavation. The monitoring results show that owing to the confinement of bored piles and reinforced concrete girders,there is a peak value within the prescribed limit between the first reinforced concrete support and the second re-inforced concrete support,and between the second reinforced concrete support and the bottom of the exca-vation respectively.%基坑支护是一项具有风险的临时工程，而基坑周围土体的位移在一定程度上反应了基坑的安全状态，因此在基坑开挖中对其周围土体进行位移监测具有重要作用。根据工程地质水文条件，基坑开挖采用钻孔灌注桩加两层钢筋混凝土支撑的围护方案。通过现场采集数据，对基坑周围土体位移进行动态分析，监测结果表明，钻孔灌注桩和钢筋混凝土支撑的约束作用使得位移在两层支撑之间和第二层支撑与基坑底之间出现峰值，但峰值都在规定范围内，从而保证了基坑开挖的安全。