Structure for eliminating reservoir bottom geomembrane impervous blanket reverse seepage pressure and construction method

Abstract

The invention relates to a structure for eliminating reservoir bottom geomembrane impervous blanket reverse seepage pressure and a construction method. The structure and the construction method aim at improving the geomembrane seepage control effect on the premise that no drainage channel under a geomembrane is additionally arranged, eliminating reverse seepage pressure caused by underground water of a reservoir bank and guaranteeing safe operation of a geomembrane. According to the technical scheme, the structure for eliminating the reservoir bottom geomembrane impervous blanket reverse seepage pressure comprises the natural reservoir bank with the seepage control capacity and a reservoir bottom with a leakage channel; the reservoir bottom is covered with a geomembrane seepage control layer, and the periphery of the geomembrane seepage control layer is provided with curtain grout or consolidation grout through a connecting plate or the tooth wall on the periphery; and meanwhile, drainage pipes are embedded into the mountain massif, close to one side of the reservoir bank, on the periphery of the geomembrane seepage control layer through drilling holes. The structure is suitable for the reservoir bottom immersed below the level of dead water; and the geomembrane is adopted for logical seepage control, and the structure is suitable for a seepage control project with the reverse seepage pressure existing on the reservoir bank and with an under-geomembrane drainage system unsuitable for arrangement and especially suitable for a reservoir basin of a pumped storage power station.

Description

technical field [0001] The invention relates to a structure and a construction method for eliminating the reverse osmosis pressure of a geomembrane anti-seepage blanket at the bottom of a reservoir. It is suitable for anti-seepage projects submerged in the bottom of the reservoir below the dead water level, using geomembrane for local seepage prevention, there is reverse seepage pressure on the reservoir bank and it is not suitable to set up a drainage system under the membrane, especially suitable for the reservoir basin of the pumped storage power station. Background technique [0002] When geomembrane anti-seepage is used as the main anti-seepage system at the bottom of the reservoir, the code stipulates that when there is reverse seepage pressure, a drainage system should be installed and drained out of the reservoir through the corridor. However, when the following conditions exist, it is not suitable to install a drainage system: geomembrane is used to treat the local ...

AI Technical Summary

Problems solved by technology

When the above situation is encountered, if the water level drops suddenly and the continuous rainfall causes a large difference in the groundwater level of the surrounding reservoir bank relative to the reservoir water level, the geomembrane near the reservoir bank is also prone to reverse seepage caused by the reservoir bank groundwater, and local formation The jacking phenomenon poses a threat to the safe operation of the geomembrane

Especially when there is a fault connecting the bank of the reservoir with the bottom of the anti-seepage area, the risk is greater

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