Gas-water pressure balanced underground anti-seepage and water-stop technology and equipment used

Abstract

The invention discloses a hydropneumatic pressure balanced type underground water seepage prevention technology and a device for the same. The device comprises a compressor, a buffer tank, a gas conveying pipeline, gas injection wells and a valve. The technology comprises the steps that the gas injection wells are formed at the periphery of a construction region at certain intervals, compressed gas generated by the compressor is injected into the gas injection wells through gas conveying pipelines, compressed gas is dispersed around inside the well through a stratum crack and a gap, and the pressure of the compressed gas injected into the gas injection wells is gradually increased till the pressure of the gas inside the gas injection wells is higher than underground water pressure; at themoment, the gas pressure around the gas injection wells and the pressure of underground water are balanced, the gas-underground water balanced regions around the gas injection wells are linked and meshed, and naturally, the gas-underground water balanced region forms a water seepage waterproof curtain wall around the construction region.

Description

technical field [0001] The invention relates to an underground anti-seepage and water-stop technology, in particular to an anti-seepage and water-stop technology for in-situ mining of oil shale and the equipment used therein. Background technique [0002] In recent years, anti-seepage and water-proof structures need to be built during the exploitation of coal, gas, and oil shale. The anti-seepage and water-proof structure is generally built around the construction area, which can effectively prevent the surrounding groundwater from pouring into the construction area. Therefore, many related research institutes and enterprises have developed a variety of anti-seepage and water-proof structures and construction techniques. Most of the commonly used ones are underground diaphragm walls or deep-stirring piles and high-pressure rotary grouting piles; A new type of water-stop curtain construction technology", which uses the method of high-pressure rotary spraying cement slurry in...

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Problems solved by technology

Therefore, many related research institutes and enterprises have developed a variety of anti-seepage and water-proof structures and construction techniques. Most of the commonly used ones are underground diaphragm walls or deep-stirring piles and high-pressure rotary grouting piles; A new type of water-stop curtain construction technology", which uses the method of high-pressure rotary spraying cement slurry in the borehole to consolidate the underground water-permeable formation, and multiple boreholes are combined to form a water-stop curtain. This process has a better effect in consolidating the underground water-permeable formation , but the construction process is complex and affects the inherent stratum structure underground, it is difficult to restore the original state after the construction

Another example is the Chinese invention patent CN102278116A disclosed "A device for making an underground freezing wall and a method for making a freezing wall in a winter cold region", which uses the air in the winter cold region as a cold source to inject into the cold injection well around the construction area, and then the cold source air Freezing the underground geological body to form an anti-seepage and water-proof freezing wall can greatly reduce the construction cost, but it is greatly affected by the season and its practical application is not strong

In the field of in-situ mining of oil shale, in order to prevent the influx of surrounding groundwater from affecting underground in-situ heating and cracking of oil shale, underground freezing walls are often used, which use cold sources to circulate in the injection well to freeze the surrounding formations and groundwater together to form an anti-frozen wall. Water seepage structure; this kind of underground freezing wall can effectively block groundwater, but the use of cold source will also increase the project cost

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