高压水条件下的水平单裂隙渗透系数取值探讨  

Discussion on the Value of Permeability Coefficient of Single Horizontal Fissure under the Condition of High Pressure Water

作　　者：李双双 黄勇[1] 周志芳[1] LI Shuangshuang;HUANG Yong;ZHOU Zhifang(School of Earth Science and Engineering,Hohai University,Nanjing 211100,Jiangsu,China)

机构地区：[1]河海大学地球科学与工程学院,江苏南京211100

出　　处：《水力发电》2021年第11期26-30,共5页Water Power

基　　金：国家自然科学基金面上项目(41772235)。

摘　　要：针对高压压水试验工程中使用规程推荐计算公式计算渗透系数时出现的异常现象,推导了一种新的渗透系数计算公式,得到渗透系数与压入流量间的非线性关系,分别采用Hvorsle公式、按透水率换算公式和推导公式计算某抽水蓄能电站断层破碎带的渗透系数。结果表明,当压入流量较小时,渗透系数与压入流量近似呈线性关系;随着压入流量增大(>10 L/min),两者的非线性关系比较明显。推导方法比其他2种方法计算出的渗透系数大1~2个数量级,与断层带实际渗透系数较吻合。Aiming at the abnormal phenomenon when calculating the permeability coefficient using the recommended calculation formula in the high-pressure water pressure test project,a new calculation formula for the permeability coefficient is deduced,and the non-linear relationship between the permeability coefficient and the indentation flow rate is obtained.The permeability coefficient of the fault fracture zone of a pumped-storage power station is calculated using the Hvorsle formula,the permeability conversion formula and the derivation formula respectively.The results show that:(a)when the intrusion flow rate is smaller,the permeability coefficient and the intrusion flow rate are approximately linear;and(b)with the increase of the press-in flow rate(>10 L/min),the non-linear relationship between the two is more obvious.The permeability coefficient calculated by the derivation method is 1-2 orders of magnitude larger than the other two methods,which is more consistent with the actual permeability coefficient of the fault zone.

关 键 词：高压压水试验 水平单裂隙 渗透系数 非线性关系 

分 类 号：TV139.1[水利工程—水力学及河流动力学]