Fine exploration method for water-rich karst in complex urban environment

Abstract

The invention discloses a complex urban environment water-rich karst fine exploration method, which belongs to the technical field of underground karst exploration. The method comprises the following steps of carrying out exploration drilling in a detection area, and building a detection profile; for the same detection section, a cross-hole resistivity CT method and a cross-hole elastic wave CT method being adopted for detection in sequence; determining the spatial distribution and position of karst fissures by a cross-hole resistivity CT method, and delineating the range and boundary information of anomalous bodies by a cross-hole elastic wave CT method; and repeating steps till all detection sections are detected.

Description

technical field [0001] The invention belongs to the technical field of underground karst detection, and in particular relates to a fine detection method for water-rich karst in a complex urban environment. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] At present, the geological conditions encountered in the construction process of major infrastructure projects such as water conservancy and hydropower projects, rail transit projects, and underground projects are more complicated. For example, in the construction process of urban underground transportation projects, they often pass through water-rich karst development areas with poor self-stabilization ability and low surrounding rock strength. and other large-scale geological disasters. Since the groundwater environment is a whole with a strong correlation between the underground and the surface...

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Problems solved by technology

[0004] The inventors found that in a complex urban environment, the actual detection effect of geophysical methods will be greatly limited

Due to the interference of stray currents, vehicle vibrations and underground metal pipelines on the urban surface, conventional surface geophysical methods, such as high-density electrical methods, ground-penetrating radar, transient electromagnetic and seismic exploration, are usually unable to obtain ideal Exploration results

At the same time, water-rich karst development areas usually have the characteristics of large burial depth, high groundwater table, developed karst fissures, and rich filling materials, which also have a certain impact on the accurate detection of conventional geophysical prospecting methods.

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