Slipping film and linear cutting type soft soil geotome and operating method thereof

Abstract

A slipping film and linear cutting type soft soil geotome and an operating method thereof are provided. A sampling tube is fixed below a rear seat; a tube shoe is fixed to the lower end of the sampling tube; a piston for pushing out a soil sample is arranged in the sampling tube. The slipping film and linear cutting type soft soil geotome is characterized in that the upper end of the tube shoe is provided with a tube shoe cavity, a thin film, a clamp ring and a cutting ring are pre-arranged in the tube shoe cavity, the rear seat is provided with a rear seat cavity, a vent valve and a wire winding-unwinding device are arranged in the rear seat cavity, the wall of the sampling tube is symmetrically provided with four vent holes, the rear seat cavity is communicated with the tube shoe cavity through the vent holes, a steel wire is arranged in one vent hole, the upper end of the steel wire is fixed to the wire winding-unwinding device, an inner slit is formed in the inner wall at the connection of the sampling tube and the tube shoe, and two ends of the thin film are connected to the cutting ring and the piston respectively. Sampling side frictional resistance and end resistance are reduced, sampling disturbance is reduced, sampling quality and sampling rate are increased, and the slipping film and linear cutting type soft soil geotome is applicable to manual sampling and drilling sampling.

Description

technical field [0001] The invention relates to the fields of rock and soil geological survey and soil mechanics indoor model test, in particular to a synovial film line-cut soft soil fetcher aimed at the soft soil fetching technology. The invention also relates to the working method of this soil fetcher. Background technique [0002] In geotechnical engineering site investigation and soil mechanics indoor model test, it is necessary to obtain undisturbed soil samples at different stages for indoor testing to study the related characteristics of foundation soil. Soft soil is a type of soil that is often encountered in geotechnical engineering. Due to high moisture content, large void ratio, high compressibility, low shear strength, and mostly in a flow-plastic state, it is difficult to obtain undisturbed soil samples. The soil sampling method and soil sampling equipment directly determine the disturbance degree of sampling and the quality of soil sampling, which is a key pa...

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Problems solved by technology

During the sampling process, the soil sample entering the soil-borrowing pipe is separated from the subsoil by pulling or twisting off; in the process of pulling the soil-borrower out of the foundation, there is a vacuum suction at the bottom that prevents the soil-borrower from moving upward. Therefore, the soil at the bottom of the soil-borrower is Sample disturbance is large and easy to fall off

After the soil is collected, when the soil sample inside the soil extractor is removed for subsequent processing, due to the high clay content of the soft soil, it often adheres to the inner wall of the soil extractor. There is friction and stickiness between the soil sample and the inner wall, which causes a large secondary disturbance of the sample taken, and reduces the sampling rate

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