Advanced detection method for focusing chromatography induced polarization of underground engineering

Abstract

The invention relates to an advanced detection method for focusing chromatography induced polarization of underground engineering. The advanced detection method comprises the following steps of: arranging a circle of shield electrodes A1 on a contour line of an operating surface of the underground engineering by utilizing a focusing operating manner and arranging a plurality of parallel measuringlines on parts with different heights from a base plate to a top plate firstly, wherein the measuring lines are provided with power supply electrodes and receiving electrodes, and the base plate is also provided with power supply electrodes and receiving electrodes; acquiring data layer by layer by utilizing a chromatography method; carrying out inversion on measuring line potential difference data obtained through measurement to obtain a three-dimensional resistivity image of a geologic body in the front of the operating surface; drawing a relation coordinate graph of difference data and horizontal distances of half time by using the half time obtained through measurement, calculating an envelope area St of half time difference and abscissa axis, and drawing a two-dimensional profile mapof the envelope area St to realize estimation of the quantity of water in the front of the operating surface. The advanced detection method for the focusing chromatography induced polarization of theunderground engineering, disclosed by the invention, has excellent advanced detection directivity, realizes three-dimensional location of an aquifer and solves problem of incapability of location in a traditional focusing electric method during single-point measurement.

Description

technical field [0001] The invention relates to a method for advanced detection of unfavorable geology and geology in the construction process of underground engineering such as tunnels or tunnels. Background technique [0002] At present, my country has become the country with the largest construction scale and the most difficult construction of tunnels and other underground projects in the world. Frequent geological disasters during the construction period of underground engineering have become a huge challenge for underground engineering construction, and water inrush and mud inrush disasters are in the forefront in terms of the number of occurrences and the number of deaths. It is of great significance to implement advanced forecasting of water inrush disaster sources in underground engineering construction. For the advanced detection of water-bearing geological structures, there are two main tasks: ① It is necessary to find out the location, scale and even shape of the...

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Problems solved by technology

Among them, the non-focused advanced detection method of the three-pole method cannot shield the side anomaly interference near the survey line (such as low-resistance water-bearing bodies, metal components, etc.), and it is difficult to extract the front of the excavation face from the background interference data in a more complex environment. The use of useful information can easily lead to lower forecast accuracy or even false alarms. This problem has not been well resolved, which seriously restricts the development of three-pole non-focused electrical forecasting technology.

[0005] However, the current focus-type electrical method still has the following problems: ①The existing focus-type electrical detection methods all draw on the idea of ​​petroleum logging, and belong to the single-point focus type, that is, only a single measuring electrode is set on the detection surface. The three-dimensional information of the geological body cannot be obtained without using tomographic detection; ②Using the curve of each measurement result and the tunnel mileage to infer the water content in front of the excavation face, the detection distance is relatively small, and the current focused electrical detection technology has not yet entered the practical stage

③ None of the current electrical forecasting methods can realize the estimation of the water volume of the water-bearing body. The estimation of the water volume based on geophysical exploration technology has become a technical problem in the field of tunnel engineering at home and abroad.

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