成都地铁19号线二期工程明挖车站防汛应用

Flood Control Application of Open-cut Station of Chengdu Metro Line 19 Phase Ⅱ Project

随着大力发展地铁建设,明挖车站基坑工程越来越多,而基坑坍塌、失稳事件频频发生,其中有一半以上是直接或者间接与基坑土体内的水相关,降雨是导致基坑发生变形、失稳、破坏的主要诱导因素之一。以成都地铁19号线二期工程合江站及站前站后明挖区间基坑工程防洪度汛为背景,从汛期暴雨强度、基坑周边及基坑汇水、沟渠行洪能力验算、水泵配置和选型等角度进行分析计算,制定针对性应对措施,为雨季施工安全度汛提供了有力的技术支撑。

With the vigorous development of subway construction,more and more open-cut station foundation pit works have been built.Foundation pit collapse and destabilization occur frequently,more than half of which are directly or indirectly related to water in the soil body of the foundation pit.Rainfall is one of the main inducing factors leading to deformation,destabilization and destruction of the foundation pit.Taking the second phase project of Chengdu Metro Line 19 as background,this paper makes analysis and calculation from the perspectives of rainstorm intensity in flood season,collection of water around foundation pit and foundation pit,checking calculation of flood carrying capacity of ditches,allocation and selection of pumps.This paper formulates corresponding measures,which provide strong technical support for construction safety during rainy season.