Acoustic wave device and method for metro shield tunnel front boulder detection

Abstract

The invention discloses an acoustic wave device and a method for metro shield tunnel front boulder detection. The device comprises an acoustic wave transmitting system and an acoustic wave receiving system, wherein the acoustic wave transmitting system comprises an acoustic wave transducer arranged in a tunnel drilling hole for transmitting acoustic wave signals; the acoustic wave receiving system comprises an acoustic wave receiving sensor arranged at the end part of an anchor rod in a tunnel surrounding rock; and the acoustic wave transducer and the acoustic wave receiving sensor are respectively independently connected with a control system. The drilling hole and the anchor rod existing in the field are made full use of, layout of the acoustic wave transmitting and receiving devices is realized, the cost is low, the mounting is quick, and influences on construction are little; by using an advanced geological drilling hole already existing in the shield construction tunnel, quick layout of the acoustic wave transmitting system is carried out, an attenuation role on acoustic wave excitation by a mud area in front of a tunnel face can be effectively avoided, and the detection effects are improved; and the existing supporting anchor rod is used for mounting the receiving sensor, acoustic wave signals from the inner part of the rock can be better received, and strong reflection interference generated on a contact surface between a segment and the surrounding rock can be avoided.

Description

technical field [0001] The invention relates to boulder detection, in particular to an acoustic wave device and method for boulder detection in front of a subway shield tunnel. Background technique [0002] With the accelerated pace of urbanization, the central city continues to radiate to the surrounding areas, and the urgency of rail transit construction is gradually increasing. In the next few decades, my country's rail transit construction will usher in a prosperous period of development, and the construction of subway rail transit has become an inevitable demand for the development of the times. In the process of subway rail transit construction, shield tunneling method construction has been applied more and more. Compared with other methods, shield tunneling method construction has little impact on the surrounding environment, can effectively control soil settlement, and is convenient for organization and management. high speed. The shield tunneling method is suitabl...

AI Technical Summary

Problems solved by technology

[0006] (1) The existing boulder detection methods on the surface are easily restricted by factors such as urban road hardening, building obstructions, and frequent traffic activities. Some sections are difficult to detect on the ground. Factors such as urban noise and industrial current will also affect the seismic method, Geophysical prospecting methods such as electromagnetic method cause great interference, geological drilling and cross-hole methods require a large number of detection holes, the detection process is cumbersome and the cost is high, which affects the construction progress

[0007] (2) Affected by conditions such as serious electromagnetic interference in shield tunnels, narrow observation space, and fast excavation speed, the existing boulder detection methods in the tunnel are not ideal for judging the location, shape, and scale of the boulder. The method has advantages in detection accuracy, but the time and economic costs are high, and it is difficult to be popularized and applied on a large scale. Fast and efficient device and method for environment

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