封闭式路堑U型槽结构抗浮设计水位计算方法探讨

封闭式路堑U型槽结构作为纯地下建筑,抗浮问题非常突出。本文以北京某封闭式路堑U型槽结构工程为例,在对场区进行水文地质条件分析及远期最高水位预测的基础上,建立适用的水文地质概念模型及地下水流定解数学模型,使用FEFLOW软件建立了场区三维数值模拟模型,利用该模型进行抗浮设计水位预测。模型建立过程中考虑了场区各含水层的非均质性及场区潜水最高水位接近自然地面的工程特点。

Discussion on calculating method for anti-buoyancy groundwater level of the closed type U-shape through cutting

The closed type U-shape through cutting as underground structure stresses the issue of anti- buoyancy in high groundwater level district. Taking certain project in Beijing as the example, the method for getting the value of anti-buoyancy groundwater level for U-shape through cutting is put forward. Based on analyzing the hydrogeological conditions and predicting the long-term highest groundwater level in the site, the hydrogeological concept model is developed and the mathematical model is built. The FEFLOW software is used to create the three-dimensional numerical model for calculating anti-buoyancy groundwater level. The inhomogeneity of the unconfined aquifers and the appropinquity of the long-term highest phreatic water level to the natural ground are considered when building the numerical model.