Abstract:

With regard to the numerical simulation of the effect of pumping water from big radiation well of groundwater reservoir of Tailan River, a sophisticated numerical simulation technology of radiation well using  the radiation well substructure method and substructure switch device was proposed based on the seepage analysis of big radiation well, and a finite element analysis of unsteady seepage field of groundwater with the influence of radiation well using the improved cutoff negative pressure method, incremental iteration method and the preconditioned conjugate gradients method of solving large sparse matrix was worked out. Using the 3-D visualization finite element seepage software platform GWSS, the numerical simulation of the tests of pumping water from radiation well of groundwater reservoir of Tailan River was carried out using this software platform. The study results show that for all observation wells the average absolute error of the calculation water level was 0.22 m, the maximum average absolute error of a single well water level was 0.40 m and a minimum value was 0.02 m, the calculation results and observation results of every observation well fitted well, therefore, the reliability of the program was verified. The radiation well substructure method can accurately simulate the seepage behavior and local seepage field of radiation well and it can be used for analysis of unsteady seepage field during pumping process of the radiation wells and to evaluate the effect of radiation well drainage.

Key words: groundwater reservoir, radiation well, pumping test, unsteady seepage, finite element method