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Tunneling method of EPB-TBM dual-mode tunnel boring machine composite stratum

A technology of composite stratum and shield machine, which is applied in the direction of earth drilling, mining equipment, tunnels, etc., to ensure the progress of excavation, prolong life, and reduce construction risks

Active Publication Date: 2020-03-24
CCCC THIRD HARBOR ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this dual-mode shield machine can adapt to different stratum excavations, it is still necessary to select the excavation parameters according to different stratum conditions to ensure excavation speed, reduce disturbance to the soil and control stratum settlement

Method used

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Experimental program
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Embodiment Construction

[0042] A kind of EPB-TBM dual-mode shield machine compound stratum excavation method of the present invention, according to different stratum conditions, the following excavation modes are selected in combination with equipment:

[0043] When excavating water-rich sandy soil with a buried depth of 18.8-21.4 meters, the shield machine is in EPB mode and earth pressure balance excavation is adopted, and the pressure value of the soil bin is set at 1.8-2.0 bar; the cutterhead speed is 1.2-1.4r / min, the cutter head torque is 1400-2500KN m; the propulsion speed is 40-60mm / min; the thrust is 1300-1900t; the screw conveyor speed is adjusted according to the soil pressure; the grouting volume is 5-5.5 cubic meters; the muck improvement: High-concentration foam and bentonite are used; slag output per ring: within 41 cubic meters; seal behind the shield: use high-quality grease;

[0044] This kind of stratum has poor self-stability and is easy to collapse when it encounters water. Duri...

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Abstract

The invention discloses a tunneling method of an EPB-TBM dual-mode tunnel boring machine composite stratum. The tunneling method is characterized in that in terms of water-rich sandy soil with a stratum of 18.8-21.4 meters in buried depth, silt soil with a stratum of 21-23.5 meters in buried depth, sludge and muddy soil with a stratum of 23.8-24.4 meters in buried depth and an upper-soft and lower-hard stratum of 23 meters in buried depth, a tunnel boring machine is in an EPB mode and adopts a soil pressing balance mode for tunneling; in terms of tunneling on a hard-rocky stratum, the tunnel boring machine is in a TBM mode and adopts an open mode for tunneling; in terms of an upper-soft and lower-hard with a stratum of 16 meters in buried depth, the tunnel boring machine is in the EPB modeand adopts the soil pressing balance mode for tunneling; and in terms of soft rock with a stratum of 16 meters in buried depth, the tunnel boring machine is in the EPB mode and adopts a half-open mode for tunneling. According to the tunneling method, ground settlement or bumping amount can be decreased to the greatest extent, the tunneling efficiency can be ensured, and construction risks and engineering investment are reduced.

Description

technical field [0001] The invention relates to an excavation method for a compound formation of an EPB-TBM double-mode shield machine. Background technique [0002] Shield tunneling is a large-scale mechanical equipment used in the construction of subway tunnels. It integrates excavation, slag removal, lining, and support. It has the advantages of high automation, fast speed, safety and efficiency. In recent years, in tunnel projects has been widely applied. [0003] In the construction of subway tunnels, it usually involves the construction of strata with different geological conditions. As far as shield construction is concerned, it needs to be divided into hard rock stratum and soft rock stratum according to the hardness of the stratum, and the shield machine is based on the hardness of the stratum. The division is also correspondingly divided into two excavation modes, one is the TMB excavation mode suitable for hard rock formations, and the other is the EPB excavation...

Claims

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Application Information

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IPC IPC(8): E21D9/06
CPCE21D9/06E21D9/0678E21D9/0685
Inventor 于海涛谢茂累陈可威王建忠王利伟程祥
Owner CCCC THIRD HARBOR ENG
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