定压非稳流压水试验求水文地质参数方法

Measurement of Hydrogeological Parameters by Packer Test with Unsteady Phreatic Flow

针对传统吕荣试验的诸多不足和限制,通过建立含水层在定压压水条件下的非稳流场数学模型,利用定压压水试验非稳流阶段的观测结果,分别采用直线法、配线法和迭代法推求出了岩体的渗透系数、压力传导系数和单位储水系数等水文地质参数。结果表明:采用不同计算方法求得的岩体渗透系数较为接近,而压力传导系数和单位储水系数对计算方法更为敏感;直线法和配线法易受到观测精度等因素的影响;迭代法适用性较强,可以有效避免人为数据选取和一些精确度较低的观测值的影响。

A packer permeability test with unsteady flow was proposed to overcome the limits of the wildly used Lugeon test. A mathematic model was established to describe phreatic water movement with point source of water injection. Three methods,including linear method,wiring method and iterative method,were applied to calculate hydrogeological parameters,which included permeability,hydraulic conductivity and storativity. The results show that the permeability calculated by methods above is closed to each other,while the other two parameters are much more sensitivity to method choosing. Linear and wiring method are sensitive to accuracy of experimental data,while the iterative method is more flexible and could avoid the influences of manual data choosing and data with low accuracy.