Method for preventing blocking and water gushing in recharge well

Abstract

The invention discloses a method for preventing blocking and water gushing in a recharge well. The method comprises the following steps: a first rubber pneumatic bag and a test box are used to conduct a calibration test to obtain three grout amounts A, B and C; a sedimentation pipe, a filter and a well casing in the recharge well are sunk into a wellhole after being in butt joint, and a gravel filtering layer and a clay ball water-resisting layer are constructed; a second rubber pneumatic bag is filled with cement grout on the ground till the total grout amount reaches A; an iron ring is placed at the upper part of the second rubber pneumatic bag, and is sunk into the clay ball water-resisting layer in the wellhole together with the second rubber pneumatic bag; the second rubber pneumatic bag is filled with grout till the total grout amount is 1.1-1.2 times of B; a concrete water plugging layer is constructed to a wellhead; the second rubber pneumatic bag is filled with grout till the total grout amount is 1.15-1.25 times of C. The method has the advantages that the phenomena that a filter layer fails due to blocking and recharge water gushes upwards during the operation process of the recharge well, which are resulted from inevitable well casing perturbation during the well completion construction process, can be avoided effectively, and in addition, other measures such as recharge water pretreatment is taken, so that the normal work of the recharge well can be ensured finally.

Description

technical field [0001] The invention belongs to the field of foundation pit dewatering by using recharge to control ground subsidence, or the field of groundwater resource management and the field of groundwater treatment, and more specifically relates to a method for preventing blockage and water gushing in recharge wells. Background technique [0002] During the excavation of the foundation pit, the problem of controlling the confined water is often encountered. It is common practice to use depressurization wells to depressurize confined aquifers. At the same time, in order to reduce the impact of precipitation in the pit on the environment outside the pit, water-proof curtains are often used to cut off the confined aquifer. However, as the excavation depth of the foundation pit increases, the confined aquifer that needs to be controlled becomes deeper and deeper. At this time, if the water-proof curtain is still used to cut it off, the depth of the water-proof curtain wi...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the technical problem of clogged water gushing that often occurs in conventional recharge wells, and provides a method for preventing clogged water gushing in recharge wells. The failure of layer clogging and the upwelling of reinjection water during the operation of the reinjection well, combined with other reinjection water pretreatment measures can finally ensure the normal operation of the reinjection well

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