邻近基坑同步施工相互影响实测分析

发布时间：2018-06-09 21:22

本文选题：相邻基坑 + 地表沉降　；参考：《土木工程学报》2015年S2期

【摘要】：近距离相邻基坑前后施工时,后基坑的施工相当于对前基坑周边卸载,必然会对前基坑产生一定的影响。对杭州下穿湘湖某相邻基坑工程进行施工监测,主要监测内容包括混凝土支撑轴力、钢支撑轴力、深层土体位移和地表沉降等。监测结果表明:双基坑施工与单基坑施工时深层土体位移变化等规律有明显区别,后基坑在开挖过程中会减小前基坑的支撑轴力,并使相邻基坑之间的土体向前基坑倾斜。同时双基坑与单基坑混凝土支撑受拉情况明显不同,总结并对比单双基坑工程中混凝土支撑"拉/压"轴力比,双基坑的"拉/压"比值相对单基坑更大,这与基坑土体向坑外移动相呼应。
[Abstract]:When close adjacent foundation pit is constructed before and after construction, the construction of rear foundation pit is equivalent to unloading the periphery of front foundation pit, which will inevitably have a certain influence on the front foundation pit. The construction monitoring of an adjacent foundation pit project under Xianghu Lake in Hangzhou is carried out. The main monitoring contents include axial force of concrete support, axial force of steel bracing, displacement of deep soil mass and ground subsidence, etc. The monitoring results show that the displacement of deep soil in the construction of double foundation pit is obviously different from that in the construction of single foundation pit. In the process of excavation, the supporting axial force of the front foundation pit will be reduced and the soil between adjacent foundation pits will be inclined forward. At the same time, the tension of concrete bracing in double foundation pit and single foundation pit is obviously different. The ratio of "pull / compression" axial force of concrete bracing in single and double foundation pit is compared with that of single foundation pit, and the ratio of "pull / compression" of double foundation pit is larger than that of single foundation pit. This is consistent with the movement of the foundation pit soil to the outside of the pit.
【作者单位】：浙江大学城市学院土木工程系;浙江大学建筑工程学院;中国建筑西南勘察设计研究院有限公司;
【基金】：浙江省科技厅资助项目(2013C31041) 杭州市科技计划项目(20130533B28)
【分类号】：TU753

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