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本文主要介绍了南昌某深基坑的支护形式、施工以及监测方案,并对所监测项目的结果进行分析与整理。研究结果表明:桩锚支护体系能够有效地控制基坑的水平位移,并且桩顶测斜孔水平位移、沉降变化和地下水位的变化是比较有规律的。基坑在开挖到设计标高时应及时加设支撑,开挖到基底设计标高时应及时施作底板,以减小土体的水平位移及地表沉降。锚索预应力在张拉后有较大的损失,损失在10%~20%之间,在开挖过程中锚索拉力有所增加,大约在15%左右。本文的监测方法和监测结果对同类工程有较好的参考价值。
This paper mainly introduces the support form, construction and monitoring plan of a deep foundation pit in Nanchang, and analyzes and sorts the results of the monitoring project. The results show that the pile-anchor supporting system can effectively control the horizontal displacement of foundation pit, and the horizontal displacements, settlement changes and groundwater level changes of pile inclined axis are quite regular. When digging to the design elevation, the foundation pit should be provided with support in time. When excavating to the design elevation of the foundation, the bottom plate should be applied in time to reduce the horizontal displacement of the soil and the settlement of the ground surface. The prestressed anchor cable has a greater loss after tensioning, with a loss of between 10% and 20%. During the excavation process, the tensile force of the anchor cable has increased, about 15%. The monitoring methods and monitoring results of this paper have good reference value for similar projects.