Multi-directional Detection Method of Underground Karst Cave
A multi-directional, karst cave technology, applied in geophysical surveying, measuring devices, electrical/magnetic exploration, etc., to achieve accurate detection, eliminate potential safety hazards, and wide application range
Active Publication Date: 2015-10-28
邓业灿
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Problems solved by technology
In fact, even through the preliminary and detailed survey of the project site and the advance drilling of each pile with 1-2 holes before the pile is formed, it is difficult to prevent the limestone site under complex conditions from still having a large number of The underground karst caves have not been exposed and there are still hidden dangers to the safety of half of the rock-socketed and half of the karst caves after the foundation piles are piled up.
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[0040] The following descriptions are only preferred embodiments of the present invention, and therefore do not limit the protection scope of the present invention.
[0041] Principle Description
[0042] Most of the underground karst caves and unfavorable geological bodies in the construction site are located below the groundwater level. When the underground karst caves and other unfavorable geological bodies are filled with water or cement sand, their resistivity is generally 10. -1 -3×10 2 Ω.m, while the resistivity value of limestone surrounding rock is generally 3×10 2 -10 4 Ω·m, there are obvious electrical differences between unfavorable geological bodies such as underground caves and surrounding rock limestone, so the characteristics of electrical differences can be used to explore the spatial distribution of unfavorable geological bodies such as underground caves.
[0043] Based on the obvious difference in conductivity between the above-mentioned unfavorable geolo...
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The invention discloses an underground cave multi-facet detection method. The method comprises the following steps: (1) a probe hole is arranged at a position needing detection on the ground; and (2) a power supply electrode A, a measuring electrode M and a measuring electrode N are arranged in the probe hole, a power supply electrode B is arranged on the ground of the probe hole, and a voltage magnitude delta u at the two ends of a measuring point O is successively measured in the probe hole by using the measuring electrode M and the measuring electrode N according to a set point distance; when the voltage magnitude delta u of the measuring point O is measured, the power supply electrode A, according to a set electrode distance extreme difference, successively enlarges the polar distance between the power supply electrode A and the measuring point O and successively records the voltage magnitude delta u of the measuring point O; at the same time, the current value I of the power supply loop between the power supply electrode A and the power supply electrode B is recorded; and the situations of underground caves can be analyzed and determined according to the curve abnormal characteristics of the B [rho] curve diagram of each measuring point. Compared with the prior art, the underground cave multi-facet detection method has the following advantages: the underground caves can be detected in a direct, rapid, economic and accurate manner, safety risks are eliminated, the application scope is wide, the precision is high, and the like.
Description
technical field [0001] The invention relates to the field of underground karst cave detection, in particular to a multi-directional detection method for underground karst caves. Background technique [0002] In areas where karst caves are developed, in order to ensure the safety of the construction project, the construction parties spare no effort to invest a lot of manpower, financial resources and time in the preliminary exploration of the project site, detailed exploration and advance drilling of the pile positions. The purpose is to find out the site and pile positions. The development of unfavorable geological bodies such as karst caves and weak interlayers. In fact, even through the preliminary and detailed survey of the project site and the advance drilling of each pile with 1-2 holes before the pile is formed, it is difficult to prevent the limestone site under complex conditions from still having a large number of The underground karst caves have not been exposed a...
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IPC IPC(8): G01V3/00
Inventor 邓业灿
Owner 邓业灿