A construction test method for improving the slag soil of shield tunneling with water-rich sand layer

Abstract

A water-rich sand layer shield tunneling slag improvement construction test method includes the following steps: 1. Adding prefabricated modifiers to the shield machine cutter head, soil bin and screw conveyor respectively. 2. Determine the modifier parameters: Select the first 100m of the shield as the test section, set the same excavation parameters, and set different modifier parameters, and test the excavation in the test section. 3. Measure the parameters of the tunnel, the amount of unearthed soil and the improvement parameters of the slag after the excavation, and adjust the parameters of the modifier to determine the parameters of the modifier during the formal excavation. 4. Determine the excavation parameters: the parameters of the modifier are the same, and the shield machine will try to excavate in the test section under different excavation parameters. 5. Measure the tunnel parameters, excavation volume and slag improvement parameters after excavation and adjust the excavation parameters to determine the formal excavation parameters of the shield machine. The method solves the problem that in the prior art, due to the unreasonable setting of the modifier parameters and the tunneling parameters, the slag soil improvement effect is not good, the tunneling speed is reduced, and the wear of the shield machine is increased.

Description

technical field [0001] The invention relates to the technical field of shield tunnel construction, in particular to a construction test method for improving slag soil in shield tunneling of a water-rich sand layer. Background technique [0002] The EPB shield machine is widely used in the tunnel construction in the subway section. However, due to its own design reasons, the EPB shield machine is difficult to excavate in the full-section water-rich sand layer, with large settlement and difficult excavation. The stability of the surrounding rock and soil mass on the excavation face is not easy to maintain. [0003] Due to the poor flow plasticity of the slag in the water-rich sand layer, the large friction coefficient and the high strength, the thrust of the shield machine is greatly increased, the excavation is not easy, and the shield machine is severely worn, and the tunneling speed is reduced or even unable to advance. At present, in order to solve the above problems, the...

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Problems solved by technology

[0005] The present invention determines the best modifier parameters and tunneling parameters by carrying out trial tunneling in the test section, and solves the problem of improvement effect of dregs due to unreasonable setting of modifier parameters and tunneling parameters in the process of shield tunneling in the prior art Poor, reduce tunneling speed, increase shield machine wear

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