临近高边坡及既有建筑物深基坑开挖施工技术研究与风险评估

Study on Construction Technology and Risk Assessment of Deep Foundation Pit Excavation Near High Slopes and Existing Buildings

文章针对西安地铁某车站复杂地形情况下的深基坑开挖,基于深基坑边缘存在高边坡,而高边坡上又存在既有建筑物且为公共建筑的复杂条件下的深基坑开挖施工技术研究,提出合理可行的施工方案,将多个风险源影响降到最低,保证工程的控制指标在容许范围之内。并通过对长达一年的施工监测数据进行分析,结果表明,通过优先施做护坡桩、采用拉槽法开挖基坑,可以有效降低对高边坡及建筑物的影响。说明该方案在保证基坑安全的同时,保护了周边边坡及建筑物的稳定,提高了工作效率,可为后期类似工况的方案拟定提供了经验和参考。

This article is aimed at the excavation of a deep foundation pit under the complex terrain of a station in Xi’an Metro.Based on the fact that there is a high slope at the edge of the deep foundation pit,and there are existing buildings which are public buildings on the high slope,research on the construction technology of foundation pit excavation is carried out,and reasonable and feasible construction plans are put forward to minimize the impact of multiple risk sources,and ensure that the control indicators of the project are within the allowable range.And through the analysis of the construction monitoring data for a year,the results show that the impact on high slopes and buildings can be effectively reduced by giving priority to the construction of slope protection piles and the excavation of foundation pits by the trough method.It shows that while ensuring the safety of the foundation pit,the scheme protects the stability of the surrounding slopes and buildings,improves work efficiency,and can provide experience and reference for the later planning of similar working conditions.