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基坑降水是基坑开挖的关键环节 ,能否在规定时间内将水降至基坑底 0 .5m以下 ,且不对周围建筑物构成威胁 ,降水方案设计是关键。降水方案的设计涉及基坑所处位置的地质和水文条件、周围建筑情况以及基坑大小、深度、支护方式、开挖方式和工期要求等因素。以往在对基坑降水方案进行模拟计算时 ,多采用简化的经验公式 ,误差较大。文中根据饱和—非饱和三维渗流数学模型 ,采用有限元法进行求解 ,解决了基坑降水效果的模拟问题
Foundation pit dewatering is a key part of pit excavation. Whether it can reduce water below 0.5m at the bottom of foundation pit within a specified time and does not pose a threat to the surrounding buildings, the design of precipitation plan is the key issue. The design of the precipitation program involves the geological and hydrological conditions of the location of the foundation pit, the surrounding building conditions as well as the size, depth, supporting methods, excavation methods and construction period requirements of the foundation pit. In the past during the simulation of foundation pit precipitation program, the more simplified empirical formula, the error is larger. According to the mathematical model of saturated-unsaturated three-dimensional seepage, finite element method is used to solve the simulation problem of foundation pit dewatering effect