Test system and method for simulating muck improvement and migration

Abstract

The invention provides a test system and method for simulating muck improvement and migration, and relates to the field of muck improvement simulation. The test system comprises a soil bin and a conveying assembly. A rotating cutter head coaxially arranged with the soil bin is installed in the soil bin, and a driving mechanism penetrates through the wall of the soil bin to be connected with the cutter head and can drive the cutter head to reciprocate in the axial direction of the soil bin. The conveying assembly comprises a spiral conveying mechanism, the spiral conveying mechanism penetrates through the side wall of the soil bin to be communicated with an inner cavity of the soil bin, and a plurality of pressure sensors are arranged outside the spiral conveying mechanism and can measure the internal pressure field of the spiral conveying mechanism to feed back and adjust the deslagging speed of the spiral conveying mechanism. Bentonite and foam-polymer mixed liquid injection ports are arranged in the upper portion of the soil bin test device and the upper portion of a spiral conveyor, muck improvement can be conducted, and a corresponding weighing sensor is arranged on the outer side of the pipe wall of the spiral conveyor to measure a stress curve in the machine body so as to explore the muck migration rule. Therefore, technical support is provided for expanding the application range of the earth pressure balance shield in high-permeability and low-fluidity gravel stratums.

Description

technical field [0001] The disclosure relates to the field of slag soil improvement simulation, in particular to a test system and method for simulating the movement of slag soil improvement. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Earth pressure balance shield tunnel boring machine excavation has the advantages of low engineering cost, safe construction environment, little interference to the normal operation of ground traffic in the construction area, friendly man-machine environment, and high excavation efficiency, so it has become the first choice for urban subway tunnel excavation. The main method. However, with the development of tunnel construction in our country, more and more tunnel projects are being built in unfavorable geological regions. If the excavated soil is not handled properly during the construction process,...

AI Technical Summary

Problems solved by technology

However, the muck transportation process in the actual engineering of shield tunneling is jointly constructed by the soil bin system, cutting system and screw conveyor system. There are very few test devices, and it is urgent to fill in the blank of this test device. At the same time, the slag cut in actual construction often needs to be improved by adding foam agent, bentonite slurry and high molecular polymer, so as to make the slag Soil properties satisfy the properties of low internal friction, low water permeability, and good soft viscosity. Existing test devices often ignore the problem of muck improvement; The docking angle of the conveyor device is generally a horizontal docking, which is inconsistent with the actual situation that the screw conveyor and the soil bin form a certain angle in the actual working condition, and it is difficult to meet the test requirements

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