US 10,260,345 B2 · Shield-carried noncontact frequency-domain electrical real-time advanced detection system and method

Abstract

A shield-carried noncontact frequency-domain electrical real-time advanced detection system and method are provided. Noncontact electrodes are installed on a cutter head of a shield tunneling machine, current is emitted and received using capacitance coupling, the electrodes are connected to a host via a multi-way swivel joint, measured data is inversed and interpreted in real time, and the prediction result is transmitted to a control system of the shield tunneling machine so as to provide a technical support for safety construction of the shield tunneling machine; the noncontact electrodes are installed on the shield cutter head. Real-time advanced detection of geology in front of a tunnel face can be realized in the tunneling process, so that the requirement for quick tunneling construction is met, and the efficiency of advanced geological detection of the shield tunneling machine is improved; and an electrode system is only installed on the cutter head.

Claims17

Dependent claims

A shield-carried noncontact frequency-domain electrical real-time advanced detection system, comprising a noncontact electrode unit, a multi-way swivel joint, an electrode positioning unit, a power supply and measurement unit and a control unit, wherein the noncontact electrode unit comprises a plurality of noncontact electrodes arranged on a front panel of a cutter head and is used for array-type multi-way information acquisition, the electrode positioning unit is arranged in a middle portion of a rear panel of the cutter head and used for determining rotating positions of the noncontact electrodes for real-time positioning;

the multi-way swivel joint is arranged behind the cutter head, a connection cable for each noncontact electrode is converged to a multi-core cable, the power supply and measurement unit outputs multi-way frequency-domain current and acquires signals, and the control unit is connected with the power supply and measurement unit and used for acquiring data of the noncontact electrodes and positions of the electrodes on the cutter head according to different set frequency domains and then performing three-dimensional inversion and interpretation.

A noncontact electrical real-time advanced detection method for a shield construction tunnel comprises the following steps:

(1) arranging a plurality of noncontact measuring electrodes and noncontact power supply electrodes on a surface of a cutter head of a shield tunneling machine, and arranging a power supply electrode and a measuring electrode of fixed electrodes behind the shield tunneling machine;
(2) setting an electrode positioning device to determine a position of the cutter head and spatial positions of the noncontact measuring electrodes, and setting alternating current with fixed frequency by using a control host to supply power to each power supply electrode;
(3) acquiring potentials of the noncontact measuring electrodes and the measuring electrode of the fixed electrodes at a set frequency domain, calculating a potential difference between the potentials, simultaneously determining spatial position information of each noncontact electrode, thereby accomplishing correspondence between measured data and position data;
(4) changing the set frequency domain, and repeating step (3) to obtain potentials and position data at different frequency domains;
(5) sequentially selecting different working faces for detection along with propulsion of the cutter head of the shield tunneling machine on a tunnel face, repeating step (3) and step (4), thereby realizing real-time acquisition of detected data;
and
(6) iterating the acquired potentials, inversing potential difference data measured by an array-type noncontact measuring electrode system to obtain three-dimensional resistance image distribution in front of a working face, and then interpreting geological condition in front of the tunnel face.

4 more elements

Dependencies are inferred from the claim text.

Shield-carried noncontact frequency-domain electrical real-time advanced detection system and method

Life of this patent

Shield-carried noncontact frequency-domain electrical real-time advanced detection system and method

Life of this patent

Abstract

Claims17