Earth pressure balance (EPB) shield residual soil pressure control model test apparatus

Abstract

The invention discloses an earth pressure balance (EPB) shield residual soil pressure control model test apparatus. The model test apparatus mainly comprises a truss type loading system, a cutterhead, a sealed compartment, a screw conveyer and a pressure transducer system. The truss type loading system is connected with a reaction frame through a jack. Excavation surface loading can be realized by thrust of the jack. The cutterhead and the screw conveyer are driven by a motor. The pressure transducers are arranged on different positions of a sealed compartment separator plate and a screw conveyer housing. Pressure data is monitored by PC software through data an acquisition instrument. By using the apparatus, under the conditions of different modified residual soil, different sealed compartment pressure or different screw conveyer rotating speeds, and through monitoring typical position residual soil pressure of the sealed compartment separator plate and the screw conveyer, residual soil pressure transmission mechanism in the earth pressure balance (EPB) shield sealed compartment and the screw conveyer can be verified; a mapping relation between excavation surface pressure and thesealed compartment separator plate pressure and a pressure variation relation between an inlet and an outlet of the screw conveyer can be established. Therefore, an earth pressure balance (EPB) shield construction can be guided.

Description

technical field [0001] The invention relates to an earth pressure balance shield model test device, in particular to an earth pressure balance shield dreg soil pressure control model test device. Background technique [0002] Earth pressure balance shield tunneling is the main construction method for tunnels such as urban subways and river crossing passages. During shield excavation, excavation surface instability and spewing accidents occur frequently due to uncontrolled muck pressure in the sealed cabin and screw conveyor. The muck is the transmission medium from the high pressure on the excavation face to the zero pressure at the outlet. It is the key to realize the support force control of the excavation surface and the anti-spray accident of the screw conveyor to clarify the transmission mechanism of the slag pressure in the airtight cabin and the screw conveyor. [0003] However, in the current project, it is believed that the pressure on the chest plate of the airti...

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Problems solved by technology

[0003] However, in the current project, it is believed that the pressure on the chest plate of the airtight cabin is consistent with the water and soil pressure on the excavation surface, which is inconsistent with the actual situation

However, there are many influencing factors measured on site, and it is difficult to obtain general rules. Therefore, it is necessary to clarify the mechanism of muck pressure transmission in sealed cabins and screw conveyors through model tests.

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