Device and method for monitoring earth pressure on excavation face of model shield machine

Abstract

The invention discloses a device and method for monitoring the soil pressure in an excavation side of a model shield machine, and belongs to the technical field of model shield machine test of tunnelengineering. The device comprises a cutterhead and a soil pressure monitoring system, a mini soil pressure gauge is larger in the upper and smaller in the lower, and the tail portion of the mini soilpressure gauge is connected with a lead. The mini soil pressure gauge measures the soil pressure of soil in front of the excavation side according to test design position, and a wireless emitter is fixed in the tail portion of a hollow transmission shaft of the model shield machine, and rotates together with the hollow transmission shaft. A wireless receiver is placed in a position separated fromthe model shield machine for certain distance, and can receive data measured by the wireless emitter. The hollow transmission shaft in the center of the cutterhead rotates, drives the cutterhead to rotate and cut soil, and the rotational angular velocity of the hollow transmission shaft is the same with that of the cutterhead. According to the device, the soil pressure gauge is installed on the cutterhead, and the soil pressure magnitude and change in the excavation side of the model shield machine can be monitored in real time.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering model shield machine testing, in particular to a device and method for monitoring soil pressure on the excavation surface of a model shield machine. Background technique [0002] In recent years, the construction of urban subway tunnels has developed rapidly. Due to the advantages of high degree of mechanization and low impact on the environment, the shield method has been widely used in Beijing, Shanghai, Guangzhou, Nanjing, Shenzhen, etc. large and medium-sized cities. Compared with the development of shield tunneling technology in foreign countries, the experience of shield tunneling in my country is still insufficient. In addition, the mechanical properties of the soil and the changeable hydrogeology and other factors faced by the shield tunneling are caused by the excessively small support force of the excavation surface. Accidents of shield excavation face instability occurred in ...

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Problems solved by technology

It is necessary to consider the process of cutter head rotation and shield machine jacking in the model test. At this time, when the monitoring element is installed on the cutter head, it faces a big problem, that is, with the rotation of the cutter head, the wires of the monitoring element will be damaged. strangulated

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