Water control system and method for open-type TBM construction of extra-long inclined shaft of coal mine

Abstract

The invention discloses a water control system and method for open-type TBM construction of an extra-long inclined shaft of a coal mine. The system comprises a first water drainage mechanism arranged at the front end of TBM equipment, the first water drainage mechanism pumps gushing water generated in an inclined shaft tunneling process of the TBM equipment, and pumps the water into a first water storage mechanism arranged in the TBM equipment; a second drainage mechanism and a third drainage mechanism are arranged on the first water storage mechanism, and the second drainage mechanism pumps accumulated water in the first water storage mechanism to the earth surface; a temporary water sump is arranged at the position where the length of the inclined shaft is larger than a threshold value, the third drainage mechanism pumps water in the first water storage mechanism into the temporary water sump, a fourth drainage mechanism pumps accumulated water to the earth surface, and long-distance lift is decomposed and drained in multiple sections by adopting a temporary water sump construction mode in the middle section. Surface water in the inclined shaft is rapidly treated by arranging an earth surface water guide ditch, the drainage ditch, hollow and solid inverted arch blocks and the like in the inclined shaft, so that damage to the TBM equipment is avoided; a rainshed or steel tiles are arranged to effectively prevent a TBM front-end unit from being damaged by water spraying, so that the construction progress is ensured.

Description

technical field [0001] The invention relates to the technical field of TBM construction, in particular to a water prevention and control system and method for an open TBM construction of a super-long inclined shaft in a coal mine. Background technique [0002] Coal mines are areas where human beings exploit coal resources in coal-rich mining areas. They are generally divided into underground coal mines and open-pit coal mines. When the distance to the surface is very close, it is generally chosen to directly strip the surface soil layer to excavate coal. This is an open-pit coal mine. Most of the coal mines in my country are underground coal mines, and the coal seams are far away from the surface, so it is impossible to use open-pit mining. 60% of the production of coal mines, the scope of coal mines includes a large area above ground, underground and related facilities. Coal mines are reasonable spaces excavated by humans when digging geological layers rich in coal, usually i...

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Problems solved by technology

[0003] China has carried out relatively in-depth research in the field of water prevention and control in coal mine well construction, and has also carried out some research on water prevention and control in tunnel TBM construction, but there is little research on water prevention and control in open TBM construction of long inclined shafts in coal mines. During the period of groundwater prevention and control, research was carried out from one or more aspects such as "exploration, blocking, diversion, and drainage", and the seven-character policy of "exploration, blocking, interception, drainage, sealing, diversion, and blocking" and "plum blossom style, upper and lower Water-prevention technologies such as layer-penetrating directional drilling and precise grouting have overcome technical difficulties such as wellbore excavation in overwater-filled karst fissures and fractured zones. Groundwater inrush is one of the two major problems in TBM construction of the diversion tunnel of Jinping II Hydropower Station. The principle of "explore first and then excavate" should be followed, advanced support and temporary support should be flexibly used, and the steel shield installed behind the shield-type TBM should be actively relied on for water diversion and protection, so as to reduce the impact on personnel and Risks caused by equipment; during the construction of TBM tunnels, it is difficult to deal with underground water gushing, so water exploration, drainage and pressure relief, pre-grouting and water blocking, and adequate pumping and drainage equipment can be strengthened; according to coal mine drainage design regulations, through calculation and analysis, high The inclined well drainage scheme of the two-stage drainage of the head pump and the relay water tank; the groundwater also has a certain impact on the TBM construction of the auxiliary transportation inclined well. Groundwater prevention and control is carried out from the aspects of "drainage, prevention, and blocking", but it is mainly based on TBM construction , Segment support working conditions; in summary, it is necessary to conduct research on the technical methods of water prevention and control for open TBM construction of long inclined shafts in coal mines

[0004] In the prior art, there are various problems in waterproofing during TBM construction: 1. With the increase of the excavation length, the amount of water leaking from the wellbore wall at the rear of the roadheader to the head increases gradually. If the seepage behind the roadheader If water leakage cannot be drained in time, it will flow to the front of the cutter head along the floor ditch, which will affect the TBM excavation construction and cause damage to the TBM equipment; When the roadheader passes through the water-resisting layer, there will be water penetration accidents of different degrees. If effective treatment is not carried out, water penetration accidents will occur; 3. Because the mines are generally deep and the drainage head is high, the drainage is slow, and the water pipes are under high pressure. The operation of the drainage system is unstable, and as the head increases, the TBM stays for a long time to wait for drainage, which affects the construction process; A lot of accumulated water and it is easy to flow to the front of the TBM equipment will also cause difficulties in the internal operation of the inclined shaft

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