Tester for anti-collapse performance of loose formation drilling mud protection wall and using method thereof

Abstract

The invention discloses a tester for anti-collapse performance of a loose formation drilling mud protection wall and a using method thereof, and belongs to the field of underground geotechnical engineering construction. According to the tester, an outer cylinder and a porous inner layer annular tube are used for constructing a loose sand annular accumulation body, the practical situation of drilling hole walls of loose formation such as various sand and gravel can be simulated, and the detachable porous inner layer annular tube is used for realizing the injection of mud or clear water in the loose sand annular accumulation body, after the porous inner layer annular tube is disassembled, the state of the loose sand annular accumulation body in clear water soaking is observed to intuitivelytest the anti-collapse effect of the mud protection wall, and reliable basis is provided for smooth construction of various drilling engineering of the complex formation; and moreover, the tester hasthe advantages of being simple in manufacturing, convenient in operation, capable of meeting environmental protection requirements, low in economic cost, capable of being repeatedly used, high in intuition and the like, has great popularization and application value, and has great significance in ensuring the mud use safety of the drilling engineering of the loose formation such as the sand and the gravel.

Description

technical field [0001] The invention relates to the field of underground geotechnical engineering construction, and more specifically relates to an anti-collapse performance tester for drilling mud retaining walls in loose formations and a method for using the same. Background technique [0002] In recent years, my country's urban high-rise buildings and underground space projects have flourished, resulting in the widespread application of drilling engineering, especially large-diameter bored pile engineering (pile diameter φ400 ~ 2000mm, pile length ranging from tens of meters to hundreds of meters) Billions of roots are used each year. In the construction of pile foundation engineering and various underground engineering drilling (or trenching), loose strata such as sand and gravel are often encountered. The hole wall of this type of rock and soil layer is extremely unstable, and drilling accidents such as collapse and leakage are prone to occur. How to ensure the stabilit...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a loose formation drilling mud protection wall anti-collapse performance tester and its use method to solve the problem that the existing technical means are difficult to truly reflect the anti-collapse performance of the drilling mud in loose formations such as sand and gravel. situation, adopt the technical solution of the present invention, use the outer cylinder and the porous inner annular tube to construct the annular cavity for filling loose soil to form the annular accumulation body of loose sand, so that it can simulate loose sand, gravel, etc. According to the actual situation of the borehole wall in the stratum, the detachable porous inner annular tube is used to inject mud or clear water into the loose sandy soil annular accumulation body, so that the mud can pass through the flower holes of the porous inner annular tube in the The retaining wall is formed in the ring-shaped accumulation of loose sand, and the anti-collapse effect of the mud retaining wall can be visually inspected by observing the state of the ring-shaped accumulation of loose sand and soil soaked in clear water after the porous inner annular pipe is removed. It provides a reliable basis for the smooth construction of various drilling projects in complex strata; moreover, the anti-collapse performance tester for drilling mud retaining walls in loose strata has the advantages of simple manufacture, convenient operation and use, compliance with environmental protection requirements, low economic cost, repeated use and It has the advantages of strong intuitiveness, great promotion and application value, and is of great significance to ensure the safety of mud use in sand, gravel and other loose formation drilling projects

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