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Underground karst cave intersection detection method

A technology of karst caves and detection holes, which is applied in the directions of geophysical measurement, measurement device, electric/magnetic exploration, etc., can solve the problems such as the inability to meet the requirements of engineering construction, and achieve the effect of facilitating the popularization and application.

Pending Publication Date: 2022-05-20
邓业灿 +4
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  • Description
  • Claims
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Problems solved by technology

With the advancement of science and technology, more methods such as ground high-density resistivity method, seismic reflection wave method, and ground penetrating radar have been used recently. However, because these methods are all detected along the survey line on the ground, underground caves are generally buried 20-30m underground. , so only underground karst caves buried ≥2-3m along the survey line can be detected, which cannot meet the actual engineering construction requirements

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  • Underground karst cave intersection detection method
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Embodiment Construction

[0043] The following descriptions are only preferred embodiments of the present invention, and therefore do not limit the protection scope of the present invention.

[0044] 1. Principle Description

[0045] 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 1×10 0 -2×10 2 Ω·m, and the resistivity of intact limestone is generally 6×10 2 -6×10 3 Ω·m; and the resistivity of cavities above the groundwater level is lim→∞, which is much higher than that of limestone. Therefore, the characteristics of electrical differences can be used to detect the distribution characteristics of unfavorable geological bodies such as underground caves.

[0046] The underground karst cave intersection detection method of the present invention, the detection layout is as follo...

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PUM

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Abstract

The invention discloses an underground karst cave intersection detection method, which comprises the following steps of: constructing and arranging at least three detection holes in a to-be-detected section, arranging detection equipment in the detection holes, and detecting according to detection points in the detection holes one by one to form an apparent resistivity rho s equivalent curve graph, and the buried depth, the spatial distribution morphological characteristics and the orientation of the unfavorable geologic bodies such as the underground karst cave and the like can be judged according to the abnormity reflected by the curve graph. The method has the advantages that detection is simple, efficient and accurate, unfavorable geologic bodies such as underground karst caves can be quickly and economically found out with high resolution, and application and popularization are facilitated.

Description

technical field [0001] The invention relates to the technical field of underground karst cave detection, in particular to an underground karst cave intersection detection method which can conveniently and accurately measure the central point of an underground karst cave. 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 advanced drilling of pile positions. And the development of unfavorable geological bodies such as karst caves and weak interlayers under the pile position. In fact, even through the preliminary and detailed survey of the project site and the advance drilling of 1-2 holes for each pile before the pile is formed, it is still difficult to eliminate the limestone site under complex conditions because the drilli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/00G01N27/04
CPCG01V3/00G01N27/041Y02A90/30
Inventor 邓业灿林本海严大千符剑林宗涛唐仁张苑辉赵晋武
Owner 邓业灿
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