祁凌飞, 曲新钢, 周山君, 宋子文, 杨军. 富水砂层深基坑悬挂式止水帷幕降水方案优化研究[J]. 工程力学, 2023, 40(S): 213-218. DOI: 10.6052/j.issn.1000-4750.2022.06.S025
引用本文: 祁凌飞, 曲新钢, 周山君, 宋子文, 杨军. 富水砂层深基坑悬挂式止水帷幕降水方案优化研究[J]. 工程力学, 2023, 40(S): 213-218. DOI: 10.6052/j.issn.1000-4750.2022.06.S025
QI Ling-fei, QU Xin-gang, ZHOU Shan-jun, SONG Zi-wen, YANG Jun. DEWATERING DESIGN OPTIMIZATION FOR DEEP EXCAVATION WITH SUSPENDED IMPERVIOUS CURTAIN IN WATER-SANDY LAYER[J]. Engineering Mechanics, 2023, 40(S): 213-218. DOI: 10.6052/j.issn.1000-4750.2022.06.S025
Citation: QI Ling-fei, QU Xin-gang, ZHOU Shan-jun, SONG Zi-wen, YANG Jun. DEWATERING DESIGN OPTIMIZATION FOR DEEP EXCAVATION WITH SUSPENDED IMPERVIOUS CURTAIN IN WATER-SANDY LAYER[J]. Engineering Mechanics, 2023, 40(S): 213-218. DOI: 10.6052/j.issn.1000-4750.2022.06.S025

富水砂层深基坑悬挂式止水帷幕降水方案优化研究

DEWATERING DESIGN OPTIMIZATION FOR DEEP EXCAVATION WITH SUSPENDED IMPERVIOUS CURTAIN IN WATER-SANDY LAYER

  • 摘要: 基于以色列特拉维夫市某地铁项目现场勘察以及抽水试验数据,采用三维有限元模型对A车站深基坑悬挂式止水帷幕的降水方案进行分析。经计算,国外设计分包提出的降水方案没有考虑不透水层的空间不均匀分布,造成基坑中部降水深度不能满足现场施工水位要求。通过进一步分析单井流量、降水井排布以及滤管埋深等因素对降水效果的影响,给出了优化改进建议,增大降水深度的同时减小了基坑两端与中部的水头差,有利于基坑开挖和节省成本。可供类似项目的设计、施工人员参考。

     

    Abstract: The dewatering design of deep excavation with suspended impervious curtain for A station was analyzed by using three-dimensional finite element model and based on the data of geotechnical investigation and pumping test of Metro Green Line Project in Tel Aviv, Israel. According to the simulation results, the original dewatering design could not meet the requirements of water level for construction in the middle of the foundation pit, because the spatial uneven distribution of impervious layer was not fully considered. After further analyzing the influence of several factors on dewatering effect such as discharge of single well, distribution of dewatering wells and depth range of screen, the suggestions for improvement were given, which increase the dewatering effect and reduce the head difference between both ends and the middle of the foundation pit. And it is also conducive to excavation and cost saving. This work can be used as a reference for people related to design and construction in similar projects.

     

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