北京副中心潜水含水层回灌能力试验研究
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摘要
以往传统基坑降水的做法一般是将抽出的地下水直接就近排放到地表水体甚至排水管网中。随着通州被确定为北京城市副中心,中心区建设工期紧、任务重,多种建筑物同时开工建设,同时大规模基坑降水,将可能造成中心区地下水位急剧下降,大量浅层地下水资源不能被充分利用及地面沉降等不利影响。为此,该文提出了将基坑降水抽出来的地下水就地回灌,综合利用浅层地下水资源、遏制地下水位急剧下降趋势的设计思路。该文在副中心典型区开展了1组针对潜水含水层的抽水-回灌试验,分析研究了潜水含水层的单井回灌能力,为基坑降水的抽水-回灌系统设计提供了重要依据与参数。
In the past,the traditional method of foundation pit dewatering is to discharge groundwater directly into surface water or even drainage pipe network. With Tongzhou being designated as the sub-center of Beijing,the construction period of the central area is tight and the task is heavy. Many kinds of buildings start construction at the same time. Meanwhile,the large-scale foundation pit dewatering may cause the groundwater level in the central area to drop sharply,a large number of shallow groundwater resources are not fully utilized and the ground subsidence and other adverse effects. For this reason,this paper put forward a design idea of pumping water from foundation pit dewatering in-situ recharge,comprehensive utilization of shallow groundwater resources,and restraining the rapid decline of groundwater level. In this paper,a group of pumping-recharging tests for phreatic aquifer are carried out in the typical sub-center area,and the single well recharging capacity of phreatic aquifer is analyzed and studied,which provides important basis and parameters for the design of pumping-recharging system for foundation pit dewatering.
In the past,the traditional method of foundation pit dewatering is to discharge groundwater directly into surface water or even drainage pipe network. With Tongzhou being designated as the sub-center of Beijing,the construction period of the central area is tight and the task is heavy. Many kinds of buildings start construction at the same time. Meanwhile,the large-scale foundation pit dewatering may cause the groundwater level in the central area to drop sharply,a large number of shallow groundwater resources are not fully utilized and the ground subsidence and other adverse effects. For this reason,this paper put forward a design idea of pumping water from foundation pit dewatering in-situ recharge,comprehensive utilization of shallow groundwater resources,and restraining the rapid decline of groundwater level. In this paper,a group of pumping-recharging tests for phreatic aquifer are carried out in the typical sub-center area,and the single well recharging capacity of phreatic aquifer is analyzed and studied,which provides important basis and parameters for the design of pumping-recharging system for foundation pit dewatering.
引文
[1] 鲍戈莫洛夫Γ B,阿里特舒里 A X.人工补给地下水.赵抱力,穆仲义,吴金祥译.北京:水利出版社,1980.15～25
[2] 黄大英.淤堵对人工引渗效果影响的实验研究.西北农业大学学报,1990,18(1) :72,73
[3] 李凤翀,姚旭初,杨良汉,等.北京潮白河河道井灌试验研究.工程地质学校,22(51):94～99
[4] 张志永,焦剑妮,姚旭初,等.潮白河河道回灌入渗试验研究.人民黄河,2014(11):81～84
[5] 姚旭初,王峰,孙侍卫,等.国家森林公园人工湖现场渗透试验研究.勘察科学技术,2006(6):29,30
[2] 黄大英.淤堵对人工引渗效果影响的实验研究.西北农业大学学报,1990,18(1) :72,73
[3] 李凤翀,姚旭初,杨良汉,等.北京潮白河河道井灌试验研究.工程地质学校,22(51):94～99
[4] 张志永,焦剑妮,姚旭初,等.潮白河河道回灌入渗试验研究.人民黄河,2014(11):81～84
[5] 姚旭初,王峰,孙侍卫,等.国家森林公园人工湖现场渗透试验研究.勘察科学技术,2006(6):29,30