Complex salt rock underground and water dissolution joint cavity construction method

Abstract

The invention discloses a complex salt rock underground and water dissolution joint cavity construction method. The method comprises the following steps of: 1) selecting a site for a rock salt deposit; 2) enabling a water dissolution drilled well to drill through a target rock salt layer; 3) arranging an underground vertical shaft at the center of a regular hexagon; 4) excavating in the underground vertical shaft till the bottom of the target rock salt layer; 5) excavating a communicating laneway to the bottom of the water dissolution drilled well; 6) constructing a groove in the rock salt layer at the bottom of the water dissolution drilled well; 7) cutting off rock salt and transporting to the ground; 8) mounting a sealing valve at the vertical shaft end of the communicating laneway after the end of groove construction; 9) closing the valve and continuously constructing a cavern in rock salt; 10) opening the sealing valve of the communicating laneway and discharging insoluble matters at the bottom of the cavern in rock salt to the bottom of the vertical shaft; 11) discharging the insoluble matters to the ground surface; and 12) sealing the communicating laneway after the end of construction of the cavern in rock salt. According to the method disclosed by the invention, the problem that the groove construction is difficult to perform in the rock salt with high content of the insoluble matters by water dissolution-process cavity construction can be solved; by adopting the method, the usable volume of a cavity can be improved by above 90% under the same geological conditions; and the overall economy is higher than that of a pure water dissolution cavity construction method.

Description

technical field [0001] The invention relates to a cavity-building method for salt rock underground storage, in particular to a combined cavity-building method for complex salt rock well engineering and water dissolution. Background technique [0002] Compared with other storage methods, salt rock is recognized as the most ideal medium for energy storage and permanent treatment of high-radioactive nuclear waste due to its good creep, low permeability and damage self-recovery characteristics. Salt rock is easily soluble in water, and water-soluble mining technology can be used to realize the construction of underground salt caverns in ground water-soluble mining. Water-soluble mining has the advantages of easy construction, simple process, low investment, and high efficiency. It is the main means of building a cavity in the storage room. At present, almost all underground salt rock storages in foreign countries are built in huge thick salt domes, while the salt rocks that...

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Problems solved by technology

[0003] In summary, the existing water-soluble cavity-making methods have the following deficiencies: 1. It is difficult to control the shape of the cavity effectively and timely; 2. In the case of multiple interlayers, it is difficult to ensure the stability of the cavity; 3. The deposition of insoluble matter accounts for The volume of the cavity is about 50%, which seriously affects the utilization rate of the cavity; 4. It is very difficult to build a cavity by water-soluble method in rock salt with high insoluble content

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