基坑潜水疏干的简化计算在昊华水泥厂中的应用

以流线、流面、汇点的概念为基础,对稳定流双井干扰和直线隔水边界附近涌水量理论公式进行对比分析,提出了二个虚拟界面,其中虚拟界面Ⅰ,运用流线、流面的性质,流线方程等给出证明;虚拟界面Ⅱ则通过半无限条形降落漏斗的分析,应用元流和总流的能量方程得到流量为零,流线为零的平面。在同样条件下,条形无限涌水量是半无限潜含水层涌水量的二倍。应用总流能量方程对三种情况水头损失的分析,解释了这种关系存在的合理性,得出虚拟界面Ⅱ,并以此得出该界面内的最大残余水头计算公式。将基坑降水运用虚拟界面简化为扇形,条形半无限含水层,从而实现单井预测,该方法应用到昊华水泥厂基坑降水中,预测效果理想。

Simplified Calculation of Foundation Pit Drainage Used in Haohua Cement Works

Based on concepts of streamline, stream surface and sink, contrastingly analyzed steady flow double well interference and straight line watertight boundary vicinity water yield theoretical formulae, put forward 2 virtual interfaces, of which, the virtual interface I testified by nature of streamline and stream surface, streamline equation; while the virtual interface II testified through semi-infinite bar shaped cone of depression analysis, applied flow filament and total flow energy equation to obtain a plane with zero flow rate and zero streamline. Under a same condition, bar shaped infinite water yield is twice over semi-infinite free aquifer water yield. Through analyzed 3 instances head loss, explained rationality of the relation, gotten out virtual interface II, from this educed maximum residual head computational formula inside this interface. Put to use of virtual interface simplified foundation pit water drawdown into fan shaped, bar shaped semi-infinite aquifer, thus to realize single well prediction, the method has been used in the Haohua Cement Works foundation pit drainage and obtained perfect prediction effect.