22-27 September 2019
Trade Fairs and Congress Center (FYCMA)
Europe/Madrid timezone

Experimental research on determination of hydrogeological parameters of filled fractures by slug test

24 Sep 2019, 16:00
1h
Trade Fairs and Congress Center (FYCMA)

Trade Fairs and Congress Center (FYCMA)

Av. de José Ortega y Gasset, 201 29006 Malaga, Spain
Poster Topic 5 - Tools, methods and models to study groundwater Poster with refreshments

Speaker

Dr Yunfeng Dai (Hydrology and Water Resources Department, Nanjing Hydraulic Research Institute, China)

Description

In order to improve the efficiency and accuracy of determining the hydrogeological parameters of filled fractures, the slug test models without considering or with considering the inertia effect were deduced under the condition of finite distance radial constant head boundary. The relationship between the critical distance affected by radial constant head boundary and dimensionless storage coefficient of filled fractures satisfies the power function formula through type curve analysis. The water head response characteristics of filled fracture to slug test were revealed by analyzing the type curves in different radial positions, which provides a theoretical basis for calculating the hydrogeological parameters of filled fractures using the piezometric tube data or observation well data. In a slug test simulation platform with radial constant head boundary, water injection, pumping and pneumatic slug tests were carried out. The matching results of dimensionless water level in piezometric tubes show that the matching degree of pneumatic slug test is the highest, followed by water pumping slug test, and the worst is water injection slug test. The higher the matching degree with the type curves is, the higher the quality of the data is, and the more reliable the hydrogeological parameters calculated by this method are. The actual calculated values of storage coefficient and transmissibility coefficient also verify this index. The hydrogeological parameters determined by three kinds of slug tests show that the test platform has obvious heterogeneity. The storage coefficient and transmissibility coefficient near the main test well are larger, while the storage coefficient and transmissibility coefficient far away from the main test well are smaller.

Primary authors

Dr Yunfeng Dai (Hydrology and Water Resources Department, Nanjing Hydraulic Research Institute, China) Prof. Jin Lin (Hydrology and Water Resources Department, Nanjing Hydraulic Research Institute, China) Dr Jiangbo Han (Hydrology and Water Resources Department, Nanjing Hydraulic Research Institute, China)

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