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复杂环境条件下地铁降水回灌系统设计与研究

2021-11-06许亮欧志亮郭高轩沈媛媛戚琦南英华芮小平

城市地质 2021年3期
关键词:施工

许亮 欧志亮 郭高轩 沈媛媛 戚琦 南英华 芮小平

摘 要:针对北京市地铁丰益桥南站和丰益桥南站—终点区间施工降水回灌场地周边复杂环境,基于抽水试验、场地回灌试验、周边回灌试验等,从回灌池的深度、回灌井的深度、单井回灌水量、回灌井布置等方面设计了回灌系统。分别采用解析法和数值法检验了回灌系统方案的合理性,最终确定了以84眼小口径井和1眼大口井进行补充的回灌方案能满足施工降水排水需求。经实际运行显示,系统回灌总量7261×104 m3,实现了地铁降水排水100%资源性回灌。

关键词:复杂环境;丰益桥;地铁降水;回灌系统;数值模拟

Abstract: According to the complex environment around the construction precipitation recharge site at Fengyiqiao South Station and Fengyiqiao South Station-terminal section of Beijing Metro, the recharge system is designed from the aspects of recharge pool depth, recharge well depth, single well recharge amount and recharge well layout and based on the results of pumping test, site recharge test and peripheral recharge test. Analytical method and numerical method are used to test the rationality of the recharge system. Finally, it is determined that the recharge scheme supplemented by 84 wells and 1 large well can meet the demand of construction dewatering and drainage. The actual operation shows that the total recharge amount of the system is 7261×104 m3, with 100% resource recharge of subway precipitation and drainage realized. This enriches the engineering demonstration of precipitation recharge and is beneficial to protect the environment and save groundwater resources. It has great economic value and significance for Beijing, a big city with severe water shortage.

Keywords: complicated environment; Fengyi Bridge Subway; subway dewatering; recharge system

近年來,我国地铁建设十分迅速。据不完全统计,仅“十二五”期间,地铁线路新增1920 km,“十三五”期间城轨地铁快速发展,地铁长度约为“十二五”的3倍。截至2020年12月31日,全国(不含港澳台)共有44个城市开通运营城市轨道交通线路233条,运营里程7545.5 km,车站4660座(王洋,2021)。在地铁施工中,由于受施工技术限制,往往需要进行较大范围、长时间的降水工程,以确保施工安全、工程进度和工程质量。遗憾的是,以往绝大多数地铁施工降水多将降水排入市政工程排水系统(丁国洪,2020),部分无雨水收集系统的地区则直接排入生活用水系统,未进行回灌,增加了污水处理的载荷和污水处理的费用(牛景涛等,2004;王兆吉,2012;陈坚等,2016;刘久荣,2003;何满潮等,2002;孙颖等,2001;李怀正,2002),造成了水资源的极大浪费。

地铁降水工程具有规模大、排泄集中、排水场地有限、局部漏斗稳定等特点,水资源管理部门以及城建部门也时常面对降水抽取的地下水“白白”流走而无可奈何的尴尬。……

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