【摘要】 依托天津地区5个典型工程案例,对基坑降水引起的地面沉降规律进行了基本分析。由于基坑降水引起地面沉降的范围较远,往往能达到墙后5~10倍基坑开挖深度的距离,而实际基坑工程坑外沉降的测点往往布置在墙后1~4倍基坑开挖深度的距离,因此难以全面的获得不同类型基坑(如基坑深度不一)降水对地面沉降的影响范围。本文利用有限差分软件Modflow建立三维地下水渗流模型,并利用文化中心站的工程实测数据对该模型进行验证,最后利用该模型研究不同开挖深度的基坑(5~25m)降水对地面沉降的影响范围,并探讨5种不同止水帷幕截断方式的工况下坑内降水后坑外水位及地面沉降随时间发展关系。更多还原

【Abstract】 Based on five typical engineering cases in Tianjin center urban area, the ground settlement caused by foundation pit precipitation is systematically analyzed. Using finite difference software Modflow, 3D groundwater seepage model is established, and the mode is tested and verified by the measured data. The model is used to study the land subsidence scope influenced by different excavation depth of foundation pit precipitation(5~25m). Finally, for the five different water stop curtain truncation method, this paper discusses the relationship between pit precipitation water level and land subsidence with time.更多还原