Dewatering and drainage construction process for inclined shaft of extra-long water-rich karst tunnel

Abstract

The invention provides an extra-long water-rich karst tunnel inclined shaft dewatering and drainage construction process which comprises the following steps that an inverted-U-shaped pipeline is installed, the first end of the inverted-U-shaped pipeline extends below the liquid level of an inclined shaft, the second end of the inverted-U-shaped pipeline extends downwards from the outside of the inclined shaft to the height position lower than the first end, and a stop valve is arranged at the second end; a pump station is installed, the water inlet end of the pump station extends below the liquid level of the inclined shaft, and the drainage end is communicated with the inverted-U-shaped pipeline; closing a stop valve, and starting a pump station to fully pump water in the inverted U-shaped pipeline; and the stop valve is opened, and water in the inclined shaft is discharged from the second end under the siphonic effect. According to the inclined shaft dewatering and drainage construction technology for the extra-long water-rich karst tunnel, inclined shaft drainage can be conducted through the siphon effect, the drainage efficiency is high, the drainage process is not limited by the power of a pump station, the equipment cost and the operation cost can be reduced, and drainage facilities are small in installation and construction difficulty and short in period.

Description

technical field [0001] The invention belongs to the technical field of drainage in tunnel construction, and in particular relates to a drainage construction technique for inclined shafts in super-long water-rich karst tunnels. Background technique [0002] During the construction of water-rich karst tunnels, sudden water gushing in the cavity is often encountered. When the water gushing is large, the water in the main tunnel will flow into the inclined shaft from the through surface at the bottom of the inclined shaft. If the inclined shaft is submerged directly, the excavation operation can only be continued after the gushing water is discharged. For extra-long water-rich karst tunnels, the vertical height of the inclined shaft is usually more than 100 meters. When the inside of the inclined shaft is filled with gushing water, the main There will be a huge water pressure in the cave, so it is very risky to use the conventional method of drilling water from the main cave to ...

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Problems solved by technology

[0002] During the construction of water-rich karst tunnels, sudden water gushing in the cavity is often encountered. When the water gushing is large, the water in the main tunnel will flow into the inclined shaft from the through surface at the bottom of the inclined shaft. If the inclined shaft is submerged directly, the excavation operation can only be continued after the gushing water is discharged. For extra-long water-rich karst tunnels, the vertical height of the inclined shaft is usually more than 100 meters. When the inside of the inclined shaft is filled with gushing water, the main There will be a huge water pressure in the cave, so it is very risky to use the conventional method of drilling water from the main cave to the through-surface. In this case, it is necessary to drain the inclined well through the pump station so that the The main hole can only be drilled to discharge water after the water level drops to a safe height. However, due to the large amount of water in the inclined well, it is conservatively estimated that it can reach hundreds of thousands of cubic meters, and the continuous water inflow can reach thousands of cubic meters per day. , so the pumping station with conventional power cannot meet the drainage demand of the inclined shaft at all. On the one hand, it is difficult to install a super-large pumping station at the entrance of the inclined shaft, and the construction period is long, which seriously affects the progress of the tunnel construction. On the other hand, the super-large pumping station The cost itself, the power facilities required for its operation, and the cost of operating electricity consumption are all very expensive, and the economy is extremely poor

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