【摘要】 在基坑降水设计中,渗透系数的确定直接影响到降水方案的准确性、合理性以及可靠性,目前工程上通常采用现场抽水试验确定渗透系数,增加了时间成本以及工程造价,为此提出了一种计算稳定渗流场渗透系数的有限单元方法。该方法无需进行现场抽水试验,并考虑了水跃现象的影响,基于能量损失率最小原理计算潜水含水层的渗透系数。采用该方法计算了两个工程案例,求得了两个案例渗流区域的渗透系数,并与实测值进行对比,结果表明本文方法具有较高精度,对渗流场的分析与降水工程的设计有指导意义。更多还原

【Abstract】 In the design of foundation pit dewatering,the determination of seepage parameters directly affects the accuracy,rationality and reliability of the dewatering scheme. At present,field pumping test is usually used to determine the seepage parameters,which increases the time cost and engineering cost. Therefore,this paper proposes a finite element method for calculating the seepage parameters of stable seepage field. This method does not need field pumping test,and considers the influence of water jump phenomenon,which calculates the permeability coefficient of the phreatic aquifer basing on the principle of minimum energy loss rate. Two engineering cases are calculated,and the permeability coefficient in the seepage area of the two cases are obtained. After being compared with the measured values,the results show that the method proposed in this paper has high accuracy therefore could be used to analyze the seepage field and the design of dewatering engineering.更多还原