利用渗透张量法求取裂隙岩体渗透系数的随机误差分析

利用渗透张量法求取裂隙岩体的渗透系数是目前在求取裂隙岩体渗透系数中运用最广泛的方法之一.作者在分析裂隙岩体渗透张量计算公式的基础上,提出了利用渗透张量求取裂隙岩体渗透系数的误差的主要影响因素,详细论述了各因素对计算结果的影响.以此为出发点,利用误差的传递定律推导出了充填裂隙岩体和张开裂隙岩体的随机误差计算公式,并结合实际工程问题分别对充填裂隙和张开裂隙两种情况下利用随机误差公式进行了的误差分析.工程实践表明,误差分析的结果是合理的、可靠的.该误差公式的提出为修正利用渗透张量计算裂隙岩体渗透系数提供了一种新的思路和方法.

Random error analysis of calculating the fractured rock mass permeability coefficient by permeability tensor

It is one of the most extensively used methods to calculate the permeability coefficient of the fractured rock mass by the way of permeability tensor. This paper puts forward the main influence factors to calculate the error of the fractured rock mass permeability coefficient using the permeability tensor on the basis of analyzing the fractured rock mass permeability tensor formula, and also discusses their impact on the calculation result in detail. Regard this as the starting point, this paper deduces the random error formula of the filling and opening fractured rock mass by using the transmission law of the error and calculates the error combined with the actual project. The calculated result is reasonable and reliable. The proposition of this error formula offers a new method for calculating the permeability coefficient of the fractured rock mass by permeability tensor.