Soil pressure controllable shield tunneling machine starting and tunneling process simulation test device

Abstract

The invention discloses a soil pressure controllable shield tunneling machine starting and tunneling process simulation test device which comprises a controllable stratum stress simulation soil body box system, a shield model system with grouting and muck transportation functions and a propelling and cutting power system with absolute horizontal stability. The controllable stratum stress simulation soil body box system comprises a pressure control module and a box body; the shield model system with the grouting and muck transportation functions comprises a cutterhead base, a conical front shield body, an integrated shield tail, a shield shell, a transmission shaft, a sealing bearing, a grouting system and a muck transportation system. The propelling and cutting power system with absolute horizontal stability comprises a horizontal propelling system, a cutterhead cutting power system and a horizontal guide module. Strata stress control and shield launching and tunneling process simulation can be achieved, the real condition of shield construction is closer to, and the device is good in structural stability and tunneling process sealing performance, small in occupied area and universal in applicability.

Description

technical field [0001] The invention relates to a tunnel engineering machine, in particular to an earth pressure-controllable shield machine start-up and tunneling process simulation test device. Background technique [0002] With the development of urban rail transit, the shield method has become an indispensable construction technology for rail transit construction. At this stage, there are few studies on the interaction between the shield body and the soil, the tool and the soil, and the law of tool wear during the excavation process of the shield machine, and the relevant theories have not yet formed a complete system. On the one hand, due to the difficulty of conducting tests in actual engineering, difficulty in extracting relevant parameters, high test costs and certain safety risks, the progress of field tests has been limited; on the other hand, there is a gap between the simulated conditions of the existing shield machine simulation test device and the actual condit...

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Problems solved by technology

Although the device can simulate shield tunneling under simple conditions, there are still many shortcomings. First, the initial pressure control of the soil sample box cannot be realized, that is, the stress state of the formation cannot be simulated. Moreover, seepage and sand leakage will occur during the excavation process, which is far from the actual situation; third, the structural stability of the device is not enough, and the reaction force in the horizontal direction and the moment along the tangential direction will be generated during the simulated shield excavation. and directional stability control requirements are high, the device is obviously insufficient in this regard

[0004] Chinese utility model patent CN 211504685 U provides a high hydraulic pressure mud-water balance shield comprehensive model test device, which realizes shield tunneling posture and tool wear in the process of simulating mud-water balance shield underwater tunnel excavation under high water pressure conditions research, but the device has a high investment cost and a large volume structure, which does not have universal applicability

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