Portable resistivity method advanced forecasting system and method applicable to TBM

Abstract

The invention relates to a portable resistivity method advanced forecasting system applicable to a TBM. The system comprises a plurality of non-polarized electrodes, a terminal control box and an electrode cable series. The non-polarized electrodes are electrically connected with the terminal control box. The terminal control box is electrically connected with the electrode cable series. The non-polarized electrodes are arranged to be capable of stretching out of a TBM cutterhead hob hole and making contact with a tunnel face to detect front geological signals. The terminal control box receives the signals collected by the non-polarized electrodes and predicts a front geologic body. The potential difference between a surrounding rock mass, a shield and the terminal control box is reduced and/or eliminated through electrode cables. According to the system, detection of unfavorable geologic bodies such as a fault fracture zone, a soft and hard layered stratum, a water-bearing cave and an underground river is achieved according to geologic body resistivity difference.

Description

technical field [0001] The invention relates to the field of forward three-dimensional resistivity method advanced forecasting under the complex construction environment of TBM, in particular to a portable resistivity method advanced forecasting system and method suitable for TBM. Background technique [0002] The full-face tunnel boring machine (TBM) is an integrated tunnel construction equipment. my country is recognized as the country with the largest tunnel construction scale and construction difficulty in the world. In the next 20 years, hundreds of water diversion tunnels and 2,000 kilometers of road and railway tunnels will be planned and constructed, most of which will be constructed by TBM. In the process of TBM excavation, karst and water-rich formations, fault fracture zones, alternating soft and hard rocks, karst caves and underground rivers that may appear in the middle of the crossing line often induce water and mud inrush, tunnel collapse, and machine jamming....

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Problems solved by technology

[0006] 3. In principle, TBM occupies the tunnel space as a huge metal body, and the electromagnetic field interference is huge, which leads to the extremely unsatisfactory detection effect of advanced geological prediction technologies based on electromagnetic principles such as geological radar method and transient electromagnetic method.

Among them, the BEAM system is only for one-dimensional and two-dimensional detection, the positioning depends on forward modeling experience, the detection distance is short, the arrangement of measuring points is limited, the observation method is single, the positioning accuracy is poor, and it is impossible to describe the three-dimensional shape of adverse geological bodies. The knife needs to be modified to a certain extent; the ISIS system is only equipped with 5 TBMs in the world and there is no public report on the detection effect, and it has not been successfully promoted

Generally speaking, the advanced detection systems currently available at home and abroad need to undergo a great transformation of the TBM, occupying too much cutterhead surface, affecting the arrangement of the hob and the stiffness of the cutterhead, thereby affecting the basic functions of the TBM, and the entire hydraulic system and automatic control device of some schemes require Far beyond the capabilities of the current TBM equipment manufacturing industry

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