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在多层孔隙含水层取水时,往往以深部含水层做为开采层。但由于城市供水开采量逐年加大,造成地下水连续下降,所以便形成深部开采层与浅部非开采层的水头差,而施工排水则一般在浅部含水层中。根据上述情况,使我们有可能考虑利用这个水头差,将浅层水向深层回灌,达到降低施工水位的目的。现在,仅就我单位在北京建国门外一段地下铁施工为例,对它的可能性做如下初步分析。一、水文地质概况建国门外地区位于永定河冲洪积扇中
When taking water from a multi-layer pore aquifer, deep aquifers are often used as a production layer. However, as the amount of water supply in urban areas has been increasing year by year, the groundwater has been continuously declining. Therefore, the water head difference between deep mining and shallow non-mining layers has been formed. Construction drainage is generally in shallow aquifers. Based on the above, it is possible for us to consider making use of this head difference to recharge the shallow water to deeper levels, so as to reduce the construction water level. Now, just as an example of the construction of a subway station at a section of metro outside Jianguomenan in Beijing, I will make the following preliminary analysis of its feasibility. First, the overview of hydrogeology Jianguomen area is located in Yongding alluvial fan