Underground cave radiography detecting method

Abstract

The invention discloses an underground cave radiography detecting method. The underground cave radiography detecting method includes steps of firstly constructing a salt feeding radiography hole with the depth exceeding the design depth of a building foundation by 5m to 10m or entering 5m to 10m of continuous complete limestone at the upstream of the ground water, feeding soluble metallic compounds into the salt feeding radiography hole so that the soluble metallic compounds can flow along with the flow direction of the ground water after being dissolved by means of water filling of underground caves and communication among gaps of surrounding rock limestone and the underground caves; measuring resistivity values of the underground caves and the surrounding rock limestone; and detecting the caves in limestone areas by observing electric difference of the resistivity of the underground caves and the surrounding rock limestone. The underground cave radiography detecting method has the advantages that low-resistivity radiography of underground caves can be carried out by reducing resistivity values of the underground caves manually, the electric difference between the underground caves and the surrounding rock limestone is increased, so that resolution ratio of detecting the underground caves by resistivity method is increased, and quick, accurate and economical detection of the underground caves in the limestone areas is realized.

Description

【Technical field】 [0001] The invention relates to an underground karst cave imaging detection method for detecting the structural integrity of the foundation rock and soil layer of a building. 【Background technique】 [0002] As we all know, the integrity of the foundation rock and soil structure of a building is directly related to the safety of the building. How to accurately detect underground karst caves in limestone areas has always been considered a worldwide problem in the industry. [0003] At present, in areas where limestone underground karst caves are developed, the underground karst caves of construction projects are often located below the groundwater level. In order to ensure the safety of building foundations, construction parties spare no effort to invest a lot of manpower, financial resources and time in limestone areas. The exploration work of karst caves, but because the traditional engineering geological drilling is only a one-hole view, or the traditiona...

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Problems solved by technology

[0003] At present, in areas where limestone underground karst caves are developed, the underground karst caves of construction projects are often located below the groundwater level. In order to ensure the safety of building foundations, construction parties spare no effort to invest a lot of manpower, financial resources and time in limestone areas. The exploration work of karst caves, but because the traditional engineering geological drilling is only a one-hole view, or the traditional electrical exploration is used, the resistivity of the underground karst caves is relatively large or the scale of the underground karst caves is small, resulting in differences in resistivity and surrounding rock limestone resistivity Small and cannot be detected accurately, leaving serious safety hazards for buildings

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