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一、引言 天津市区地下水位高,土质基本属软土,在此土质条件下建造高层或超高层建筑,浅基一般满足不了要求而需要采用深基。在深基坑的开挖过程中,由于土质差,基坑深,因此坑壁受土压力的作用将不可避免地向坑内产生较大的水平位移,加之在市区繁华地段施工时,基坑离周围原有建筑物非常近,因此开挖过程中基坑周边的水平位移监测尤为重要,而且监测的精度要求也相当高,笔者通过近年来基坑水平位移监测常采用的几种方法的比较和精度分析。给出一些有实际意义的结论。
I. INTRODUCTION The groundwater level in Tianjin urban area is high, and the soil quality basically belongs to soft soil. In this soil condition, high-rise or super-high-rise buildings are constructed. The shallow foundations generally cannot meet the requirements but need to adopt deep foundations. During excavation of deep foundation pits, due to poor soil quality and deep foundation pits, the wall of the pit will inevitably generate large horizontal displacements in the pit due to the earth pressure. In addition, the foundation pit will be built during the construction of the downtown area. Because it is very close to the surrounding original buildings, the horizontal displacement monitoring around the foundation pit during the excavation process is particularly important, and the monitoring accuracy is also very high. The author has compared several methods commonly used in the monitoring of the horizontal displacement of foundation pits in recent years. And precision analysis. Give some practical conclusions.