三维地下水数值模拟方法在基坑涌水量预测中的应用——以广州地铁某基坑为例
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摘要
目前基坑涌水量常采用大井法来进行预测 ,但是对于水文地质条件复杂且不符合裘布依井流公式适用条件的情况时 ,就不适用大井法预测涌水量。本文以广州地铁某车站基坑涌水量预测为例 ,来探讨采用数值模拟软件VisualModflow解决这一问题的方法 :在水文地质条件分析的基础上 ,建立合适的水文地质概念模型并确定数值模型 ,划分水均衡区 ,最终通过水均衡的计算来求基坑内涌水量。
The discharge of foundation pit is often forecasted by using the method of the generalized large well, but under the conditions of the complicated hydrogeological conditions where the Dupit well flow formula is not suitable, the said method is not applicable. Based on the forecast of flowing yield of the foundation pit for certain station of Guangzhou Metro, the solution for the above problem is discussed through adopting numerical simulation software Visual Modflow. According to the analysis on the hydrogeological conditions the hydrogeologic concept model and the numerical model are developed. The balance zone of groundwater is planed out and the discharge of foundation pit is obtained by the calculation of the balance area.
The discharge of foundation pit is often forecasted by using the method of the generalized large well, but under the conditions of the complicated hydrogeological conditions where the Dupit well flow formula is not suitable, the said method is not applicable. Based on the forecast of flowing yield of the foundation pit for certain station of Guangzhou Metro, the solution for the above problem is discussed through adopting numerical simulation software Visual Modflow. According to the analysis on the hydrogeological conditions the hydrogeologic concept model and the numerical model are developed. The balance zone of groundwater is planed out and the discharge of foundation pit is obtained by the calculation of the balance area.
引文
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[2] 秦四清等.深基坑工程优化设计[M].北京:地震出版社,1998.
[3] 张宏程.概化大井计算法在深基坑降水中的应用[J].施工技术,2002,31(1).
[4] 高敬英,郭文斗.井点降水在基坑开挖施工中的应用[J].海河水利,1998,(2):25～26.
[5] 陈崇希,成建梅,孙红林.深基坑地下水的排降———地面沉降模型的探讨[J].勘察科学技术,1998(2):3～7.
[6] 郭卫平,卢国平编译.ModFlow三维有限差分地下水流模型[M],南京大学地球科学系,1998.
[7] 焦赳赳,王旭升等.陈崇希教授的学术思想和成就综述[J].地球科学,2003,(5):471～477.
[8] 陈崇希,林敏.地下水动力学[M].武汉:中国地质大学出版社,1996.
[9] 陈崇希,唐仲华.地下水流动问题数值方法[M].武汉:中国地质大学出版社,1990
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