Research on groundwater leakage recharge mechanism based on river bed disturbance test

As the main surface river running through the Maoping Mining Area, the Luoze River may become a water filling source for groundwater in the mining area due to river leakage.The safety management of underground mining urgently needs to determine the leakage recharge mechanism of rivers to groundwater.Thus, a riverbed disturbance test is designed in the riverway within the mining right scope.By excavating a riverbed disturbance test pit to increase the infiltration amount in local areas, the monitoring response law of nearby groundwater observation holes is used to determine the relationship and intensity of groundwater leakage recharge from the Luoze River to the mining area.The results of riverbed disturbance tests indicate that the recharge amount of Luoze River to groundwater is generally limited.There is an indirect recharge relationship.In the rock section of the Permian Qixia and Maokou Formation, the river water has a certain amount of leakage recharge.The groundwater is directly supplied by rivers to the Quaternary pore water and indirectly to the Permian karst fissure water, without any concentrated infiltration phenomenon.In the Carboniferous rock section, fractures are not developed and filled with mud.The permeability of the stratum is weak, and the recharge capacity of river water leakage is very limited.There is no centralized irrigation type recharge channel.