中文摘要：

在既有研究的基础上,假设覆盖型岩溶路基潜蚀塌陷管道模型,根据压水试验透水率公式和水力学管道流Poiseulle方程,提出了裂隙岩体透水率与裂隙开度的关系公式,建立了透水率与裂隙开度的定量联系,并结合经验结果对理论公式的适用性、局限性进行了探讨。研究结果表明：裂隙岩体透水率与裂隙开度等效半径四次方成正比,与裂隙延伸长度成反比;透水率与裂隙开度的理论关系与既有规范的经验结果有较好的一致性。

英文摘要：

Based on the experiment and theoretical studies and according to the Karst pipe model and the Poiseulle equation,the quantitative relationship between the fissure width and permeability of collapse of covered Karst during underground erosion is set up,and the application and limitation are also discussed.The results show that the permeability of rock mass is directly proportional to the four power of the equivalent radius of the fissure width,and is inversely proportional to the extent length.The consistence was found between theoretical result and the empirical result.