Advanced detection system and method for TBM (Tunnel Boring Machine) tunnel construction based on forward three-dimensional induced polarization

Abstract

The invention discloses an advanced detection system and method for TBM (Tunnel Boring Machine) tunnel construction based on forward three-dimensional induced polarization. By fully utilizing a narrow detection space of a full-face excavated tunnel, controlling the opening of cabin doors of a power supply and measuring electrode cabin and a shielding electrode cabin through controllers, and controlling corresponding hydraulic transmission devices to automatically and rapidly arrange power supply, measurement and shielding electrode systems onto a TBM tunneling working face and side wall bottom plates at the rear of the TBM tunneling working face, under the effect of a shielding current system, tomographic detection power supply current points to the front of the working face. By using the detection method based on the forward three-dimensional induced polarization, the three-dimensional geological information of the front of the working face can be obtained. Moreover, by using a relation between induced polarization half-time difference and water flow, the magnitude of the water flow of a water body can be quantitatively forecasted. In addition, the parameter, i.e. the half-time difference has a stronger ability of distinguishing free water and bound water.

Description

technical field [0001] The invention relates to the field of forward three-dimensional induced polarization method advanced prediction in TBM construction tunnels, in particular to a forward three-dimensional induced polarization method advanced detection device system and method for TBM construction tunnels. Background technique [0002] In recent years, the proportion of full-section tunnel boring machine (abbreviated as TBM) mechanical construction in tunnel construction has been increasing. The full-section tunnel boring machine uses rotary cutters to excavate, and at the same time breaks the surrounding rock in the hole and excavates to form the entire tunnel section. A new type of advanced tunnel construction machinery. When using TBM tunneling, one of the more prominent problems is that the TBM machinery has poor adaptability to changes in geological conditions. When encountering faults, broken zones, lithological interfaces, water-bearing structures and other adverse...

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Problems solved by technology

[0003] However, there is no very mature and effective advanced geological prediction method for TBM construction tunnels at home and abroad.

For advanced geological prediction devices and technologies, TBM construction is fundamentally different from drill-and-blast construction: ① TBM machinery is a giant, and TBM machinery occupies most of the space behind the tunnel face, so it cannot be arranged on the tunnel side wall The excitation shot point and receiving system of the commonly used advance prediction of seismic wave method lead to the inability of TSP, TGP, TRT and other seismic wave advance prediction technologies commonly used in drill-and-blast tunnels to be applied in TBM construction tunnels; ② There are a large number of metal components and power supplies in TBM machinery Cables have great interference to the electromagnetic field, which leads to the unsatisfactory detection effect of common advanced geological prediction technologies based on electromagnetic principles, such as geological radar method, transient electromagnetic method and induced polarization method, so that they cannot be used in TBM construction tunnels

③During TBM construction, there are about two hours of mechanical maintenance time per day. During mechanical maintenance, the TBM cutter head retreats 2-5m. This small space can be used to implement advanced geological prediction, and the space is small and the available time is short

[0004] As far as the geological advance prediction technology in TBM construction tunnels is concerned, there are mainly the following two methods: ① One is to use the advanced drilling rig equipped with TBM machinery to perform horizontal drilling. This drilling rig can only reveal the geological conditions around the drilling hole. Geological bodies that do not intersect with the borehole cannot be ascertained, and cannot reflect the geological conditions in the entire range in front of the TBM working face. It is easy to miss bad geology, resulting in false positives, false negatives, and hidden dangers of disasters, and the economic cost and time cost of drilling are relatively high. high

②The other is to use the BEAM (Bore-Tunneling Electrical Ahead Monitoring) system developed in Germany. BEAM is a one-dimensional focused induced polarization method. The disadvantage of the BEAM method is that the installation of test equipment is complicated, the test time is long, and it seriously affects The second is that the BEAM method uses the curve of each measurement result and the tunnel mileage to infer the water content in front of the tunnel face. The detection distance is small, and tomography is not used for detection, so it is impossible to obtain the three-dimensional information of the geological body in front of the TBM face. Unpredictable volume of water

In addition, judging from the application of the BEAM method in several tunnels in my country, the forecast results are not ideal and have not been popularized, and need to be improved and perfected

[0005] It can be seen that due to the narrow detection space, huge electromagnetic interference, and short available time in TBM construction tunnels, there is currently no very effective and practical advanced geological prediction technology and device.

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