Tracking changes in the specific storage of overburden rock during longwall coal mining

摘要

Highlights?A multi-method approach to estimate compressibility due to mining disturbance.?First study of the temporal change in storage associated with underground mining.?Comparison of laboratory compressibility measurement with in situ values.?Monitoring disturbance of underground mining using loading efficiency.AbstractThe hydraulic properties of geologic formations, such as specific storage and hydraulic conductivity, are known to vary spatially due to formation heterogeneity; however, they may also change temporally if the formation undergoes mechanical disturbance such as occurs during mining. Characterising changes in hydraulic properties is important for groundwater systems that are disturbed by mining. Conventional hydrogeological investigations rely on literature derived values or limited programs of field testing (e.g. pumping test) to define specific storage; but these approaches do not consider the ch