长江漫滩抽水试验与水文地质参数计算
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摘要
长江漫滩地区第四系是一个巨厚的复杂含水体,地下水丰富,对深大基坑施工影响极大。南京梅子洲过江通道连接线及青奥轴线地下交通系统工程位于长江下游漫滩,基坑最大开挖深度为27.5 m。为满足基坑降水设计及施工要求,勘察时选择有代表性的地段布置了3组抽水试验井,对潜水含水层及承压水含水层进行抽水试验,根据试验井类型和边界条件,选用潜水完整井稳定流、承压水完整井稳定流及非稳定流、承压水非完整井稳定流及非稳定流等多种地下水计算模型进行参数计算并综合分析,为设计提供水文地质参数,并实地验证了参数的合理性。
The Quaternary system in the floodplain area of the Yangtze River is a huge and complicated water body with abundant groundwater, which has a great influence on the construction of deep and large foundation pits. The underground transportation system project of the Meizizhou River-Crossing Channel Connection Line and the Youth Olympic Axis in Nanjing is located in the floodplain of the lower reaches of the Yangtze River, and the maximum excavation depth of the foundation pit is 27.5 m. In order to meet the design and construction requirements of the foundation pit dewatering, three sets of pumping test wells were arranged in representative sections, and the phreatic aquifers and confined aquifers were tested. According to the types of test wells and the boundary conditions, various groundwater calculation models, such as phreatic complete well steady flow, confined water complete well steady flow and unsteady flow, confined water non-complete well steady flow and unsteady flow were selected and used to calculate the parameters, and through comprehensive analysis, hydrogeological parameters were provided for design. The later stage of foundation pit precipitation can meet the construction requirements, which has verified the validity of the parameters.
The Quaternary system in the floodplain area of the Yangtze River is a huge and complicated water body with abundant groundwater, which has a great influence on the construction of deep and large foundation pits. The underground transportation system project of the Meizizhou River-Crossing Channel Connection Line and the Youth Olympic Axis in Nanjing is located in the floodplain of the lower reaches of the Yangtze River, and the maximum excavation depth of the foundation pit is 27.5 m. In order to meet the design and construction requirements of the foundation pit dewatering, three sets of pumping test wells were arranged in representative sections, and the phreatic aquifers and confined aquifers were tested. According to the types of test wells and the boundary conditions, various groundwater calculation models, such as phreatic complete well steady flow, confined water complete well steady flow and unsteady flow, confined water non-complete well steady flow and unsteady flow were selected and used to calculate the parameters, and through comprehensive analysis, hydrogeological parameters were provided for design. The later stage of foundation pit precipitation can meet the construction requirements, which has verified the validity of the parameters.
引文
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何文军,2016.非稳定流抽水试验在水文地质勘察中的应用[J].科研(12):201-202.
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沙俊强,王为治,欧阳平,等,2017.长江底隧道抽水试验及水文地质参数计算[J].江苏建筑(3):56-59.
徐平,周志芳,王锦国,等,2007.南京过江隧道浦口明挖段抽水试验分析[J].勘察科学技术(2):28-38.
肖裕生,施春华,2008.南京地区第四系主要地层类型及分层探讨[J].南通大学学报(自然科学版),7(2):60-65.
竺新强,宋龙荣,康宜军,等,2012.南京梅子洲过江通道连接线-青奥轴线地下交通系统建设工程岩土工程勘察报告(详细勘察阶段)[R].江苏淮安:江苏省水文地质工程地质勘察院.
供水水文地质手册编写组,1976.供水水文地质手册:水文地质计算:第二册[M].北京:地质出版社.
耿会勇,2013.长江漫滩地区长大隧道分区降水设计与应用研究[J].石家庄铁道大学学报(自然科学版),26(增刊2):212-214.
耿会勇,2015.长江沿岸深基坑长期降水条件下周边建筑物沉降控制技术研究[D].山东青岛:青岛理工大学.
何文军,2016.非稳定流抽水试验在水文地质勘察中的应用[J].科研(12):201-202.
克鲁斯曼,德里斯,1980.抽水试验资料的分析与评价[M].俞树森,译.北京:地质出版社:1-2.
阚士才,2002.抽水试验孔成井工艺的二个问题[J].黑河科技(3):641.
刘清文,车灿辉,2013.长江漫滩复杂地层条件下超大超深基坑降水设计[J].探矿工程:岩土钻掘工程,40(5):54-59.
沙俊强,王为治,欧阳平,等,2017.长江底隧道抽水试验及水文地质参数计算[J].江苏建筑(3):56-59.
徐平,周志芳,王锦国,等,2007.南京过江隧道浦口明挖段抽水试验分析[J].勘察科学技术(2):28-38.
肖裕生,施春华,2008.南京地区第四系主要地层类型及分层探讨[J].南通大学学报(自然科学版),7(2):60-65.
竺新强,宋龙荣,康宜军,等,2012.南京梅子洲过江通道连接线-青奥轴线地下交通系统建设工程岩土工程勘察报告(详细勘察阶段)[R].江苏淮安:江苏省水文地质工程地质勘察院.