Method and device for repairing loophole of HDPE (High Density Polyethylene) membrane at impermeable layer of landfill

Abstract

The invention provides a method for repairing a loophole of an HDPE (High Density Polyethylene) membrane at an impermeable layer of a landfill. The method comprises the following steps of: (A) punching and drilling a waste layer with a known thickness and a pebble layer with a known thickness in the landfill; (B) respectively extracting vibration signals generated by enabling a drill bit to enter the waste layer, the pebble layer and a clay layer, and respectively carrying out time-frequency domain analysis on the vibration signal of the waste layer and the vibration signal of the pebble layer; (C) respectively setting and judging reference values corresponding to the waste layer and the pebble layer according to the analysis results; (D) drilling from the uppermost part of the positioned loophole, and when the drill bit enters the pebble layer for a certain depth, pouring cement into the drill hole for curing the pebble layer to form a top plate protecting layer; and (E) extracting clay layer residues near the loophole, and pouring cement for repairing the loophole. The invention also provides a device for realizing the method.

Description

technical field [0001] The invention relates to a technology for repairing leaks in anti-seepage layers of landfills, in particular to a method and device for repairing leaks in HDPE membranes in the anti-seepage layers of landfills. Background technique [0002] Due to the quality or construction of the HDPE membrane (High Density Polyethylene Impermeable membrane, HDPE), the anti-seepage layer of the landfill often leaks. It is very important to find the exact location of the leak point and repair it in time. Regarding the repair of leaks, the repair methods for the seepage problems found during the laying of the anti-seepage layer and the construction of the aquifer and water collection facilities on the membrane are relatively simple. However, during the operation and closure stages, due to the accumulation of a large amount of hazardous waste on the anti-seepage layer, its repair requires not only accurate monitoring and positioning of the leakage point, but also corres...

AI Technical Summary

Problems solved by technology

However, during the operation and closure stages, due to the accumulation of a large amount of hazardous waste on the anti-seepage layer, its repair requires not only accurate monitoring and positioning of the leakage point, but also corresponding engineering measures. The conventional treatment method is through excavation and drainage measures. Repairing after the leakage point is exposed is a large amount of engineering and takes a long time. Therefore, it is particularly important to find a technology that can quickly and easily repair the leak.

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