某地下工程区域渗流场特征及结构渗漏水来源分析

某大型地下工程结构完工后出现普遍渗水现象,严重影响其使用功能,并造成了不良社会后果。通过建立区域三维渗流分析模型,结合现场结构渗漏水特征,研究了该工程的区域渗流场特征和结构渗漏水的主要来源。结果表明:①模型计算结果与工程现场实测数据基本吻合,为该地区地下工程建设中的渗流场分布问题提供一种分析方法。②工程区域内浅表层地下水主要接受大气降雨的补给,丰季时河流水位上涨,对浅表层地下水有一定反补,市政雨污管网的渗漏也是不容忽视的补给来源。③区内西溪河洪峰水位270.2m,北湖地表水体水位270.5m,工程主体的抗浮水位以270.20~270.50m考虑为宜。④根据地下结构病害特征和所在位置,提出相应的病害整治建议,整治效果良好,可在类似工程应用。

Characteristics of Seepage Field in an Underground Engineering Area and Analysis of Water Source of Structural Leakage

After the completion of a large-scale underground engineering structure, there is a general phenomenon of seepage which seriously affects its use function, and has caused the adverse social consequence. A three-dimensional regional seepage model is established in combination with characteristics of leakage water in field structure in order to make a study of characteristics of regional seepage field and main source of structural leakage water of the underground engineering. The study results indicate that the calculated results of the model are good agreement with the measured data;the shallow groundwater is mainly supplied by the atmospheric rainfall and river water has certain backfill to the shallow layer groundwater during the rainy season and;the leakage of municipal storm drain network is also a supply source can’t be ignored;in view of the 270.5 m water level of the North Lake surface water body and the 270.2 m flood peak water level of the Xixi River, the anti-floating water level of the main body of the engineering should be considered from 270.20 m to 270.50 m. Some suggestions on disease control are made.