富水砂性地层地铁深基坑监测及变形分析
引用文献：
万晶 樊冬冬 刘天任 谭勇. 富水砂性地层地铁深基坑监测及变形分析[J]. 建筑结构，2023，48（12）：138-143.
WAN Jing FAN Dongdong LIU Tianren TAN Yong. Analysis on monitoring and deformation of subway deep foundation pit in water-rich sand stratum[J]. Building Structure，2023,48（12）：138-143.
摘要：以富水砂性地层顺作法地铁车站基坑为工程背景，结合施工现场监测数据，对围护结构侧向位移变形、周边地表沉降、地下水水位变化及周边建筑物沉降进行分析，总结富水砂性地层的变形性状和对周边环境的影响。监测数据和分析结果表明：富水砂性地层条件下，地下连续墙最大侧向位移δhm的变化范围为0.045%H～0.5%H,均值约为0.22%H,发生位置在(H-4,H+10)之间；基坑开挖引起的地表沉降影响范围在35m以内，约2倍基坑开挖深度；墙后地表最大沉降发生在距离基坑5～10m左右；富水砂性地层有着地下水位高，渗透性强的特点，施工中采用疏干降水与承压降水相结合的措施可以有效控制地下水位变化；施工建设过程中对周边建筑物进行实时监测来反馈指导施工，可以保证施工对周边建筑物的影响在可控范围内。
关键词：富水砂性地层；地铁车站；深基坑；基坑降水；变形；监测；
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参考文献[1] 廖少明，魏仕锋，谭勇等.苏州地区大尺度深基坑变形性状实测分析[J].岩土工程学报，2015,37(3):458-469.
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[2] WANG J H,XU Z H,WANG W D.Wall and ground movements due to deep excavations in Shanghai soft soils[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(7):985-994.
[3] 卫彬，李想，谭勇.上海某地铁深基坑工程施工案例分析[J].施工技术，2015,44(7):72-76.
[4] LONG M.Database for retaining wall and ground movements due to deep excavations[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,44 (1):87-98.
[5] CHRISTIAN MOORMANN.Analysis of wall and ground movements due to deep excavations in soft soil based on a new worldwide database[J].Soils and Foundations,2004,44(1):87-98.
[6] 康志军，谭勇，李想，等.基坑围护结构最大侧移深度对周边环境的影响[J].岩土力学，2016,37(10):2909-2914,2920.
[7] 朱炎兵，周小华，魏仕锋，等.临近既有地铁车站的基坑变形性状研究[J].岩土力学，2013,34(10):2997-3002.
[8] 谭兴，宣霖康.陆家嘴地区超深大基坑支护结构竖向变形的实测分析[J].建筑结构，2019,49(S2):899-905.
[9] 谭勇，康志军，卫彬，等.上海软土地区某地铁风井深基坑案例分析[J].浙江大学学报(工学版),2016,50(6):1048-1055,1072.
[10] 康志军，黄润秋，卫彬，等.上海软土地区某逆作法地铁深基坑变形[J].浙江大学学报(工学版),2017,51(8):1527-1536.
[11] 龙林，李之达.长沙市某深基坑工程的监测及变形规律研究[J].建筑结构，2020,50(2):133-137.
[12] TAN Y,ZHU H,PENG F,et al.Characterization of semi-top-down excavation for subway station in Shanghai soft ground[J].Tunnelling and Underground Space Technology,2017,68:244-261.
Analysis on monitoring and deformation of subway deep foundation pit in water-rich sand stratum
Abstract: Taking the foundation pit of subway station with water-rich sand stratum as the engineering background, combined with the monitoring data on the construction site, the lateral displacement deformation of the enclosure structure, the surrounding surface settlement, the groundwater level change and the settlement of surrounding buildings were analyzed to summarize the deformation behavior of the water-rich sand stratum and its impact on the surrounding environment. The monitoring data and analysis results show that: under the conditions of water-rich sand stratum, the maximum lateral displacement δhm of the diaphragm wall ranges from 0.045%H to 0.5%H, with an average value of about 0.22%H,and the occurrence is between(H-4, H+10). The impact of surface settlement caused by excavation of foundation pit ranges within 35m, about 2 times the excavation depth of the foundation pit. The maximum settlement of the surface behind the wall occurs at a distance of about 5～10m from the foundation pit. The water-rich sandy stratum has the characteristics of high groundwater level and strong permeability, and the combination of pumping in phreatic and confined aquifers can effectively control the change of groundwater level in construction; real-time monitoring of surrounding buildings during construction can guide construction, which ensures that the impact of construction on surrounding buildings is within a controllable range.
Keywords: water-rich sand stratum; subway statio; deep foundation pit; dewatering of foundation pit; deformation; monitoring
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