Detecting method of strength of string-bead-shaped karst cave after grouting

Abstract

The invention discloses a detecting method of strength of a string-bead-shaped karst cave after grouting. According to the method, an advance borehole is used for lowering a detection electrode, a hole crossing high-density resistivity method is adopted for detecting, on the basis of sparse regularization method inversion, detection result visualization and precision can be achieved, the groutingstrength condition of the cave can be obtained, and the subsequent construction safety is ensured. Therefore, concrete test blocks with different mud contents are subjected to resistivity test in advance, the relation between compressive strength and the resistivity is suggested, after the concrete is grouted, resistivity detection is carried out, whether the injected slurry meets the expected strength needs or not can be obtained through a resistivity inversion chart, and therefore guidance of whether grouting slurry concrete strength level needs to be reinforced or grouting is increased or not can be achieved.

Description

technical field [0001] The invention relates to a method for detecting the grouting strength of beaded karst caves, and belongs to the technical field of grouting strength detection for karst caves. Background technique [0002] In recent years, with the rapid advancement of infrastructure construction, the land use is relatively tight, so that the construction personnel must deal with various unfavorable terrains and landforms, so as to meet the construction requirements. The most common of which is karst landform. To build buildings in karst areas, the defects of karst areas must be overcome. There are a large number of karst landforms in the Guangdong area of ​​my country, among which the Huadu District in the north of Guangzhou is more obvious. Therefore, how to properly deal with the earth caves and karst caves is particularly important. At present, the most commonly used method is to grout the soil cave. However, at present, there is no established method for profess...

AI Technical Summary

Problems solved by technology

However, at present, there is no established method for professional detection of grouting conditions in karst caves, such as the filling degree of grouting and the strength of concrete after grouting. Since the soil caves are deep underground, it is difficult to detect them. After grouting in caves, it is impossible to guarantee whether the grouting effect meets expectations. Once the grouting effect cannot be guaranteed, if the project construction is carried out again, the consequences will be disastrous

At present, there is a lack of strength testing for grouting in karst caves in engineering, so many operators can only do grouting based on experience or feeling, which greatly reduces the controllability and accuracy of grouting in karst caves, which is not conducive to engineering construction and development in karst areas. If the strength of grouting in the cave does not meet the requirements and cannot be detected in advance, it will do great harm to the project

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