Hydraulic device for sampling original-condition clay and method for hydraulic device

Abstract

The invention belongs to the technical field of rock-soil exploration engineering and particularly relates to a hydraulic device for sampling original-condition clay and a method for the hydraulic device. The hydraulic device for sampling the original-condition clay comprises a sampling tube and a hydraulic jack, wherein the sampling tube is of a split structure and is used for sampling the interior of the clay; the hydraulic jack is used for providing a power source for enabling the sampling tube to insert into the clay to sample; the sampling tube and the hydraulic jack are used in a matched manner in a soil groove of a clay sampling position. The sampling tube comprises a first half sampling tube and a second half sampling tube which are in snap-fit connection, and separation gaps are formed at joints of the first half sampling tube and the second half sampling tube. According to the device and the method, the soil groove is excavated, the hydraulic jack is used for applying a force, the force application is more uniform and controllable compared with hammering force application, the disturbance to a clay body is low, labor is saved, the force application is relatively uniform, and the operation is convenient and practical.

Description

technical field [0001] The invention belongs to the technical field of geotechnical exploration engineering, and in particular relates to a hydraulic device and method for extracting undisturbed clay. Background technique [0002] As a natural building material, clay has the advantages of local materials, simple technology, low cost, and certain anti-seepage effect, so it is often used as an anti-seepage layer material and widely used in water conservancy projects. Before it is applied to engineering, it is necessary to test the clay to fully understand the basic physical and mechanical properties of clay, and judge whether it can be used as an anti-seepage material. The obtained basic physical and mechanical properties parameters are also used as the design basis. Density test, penetration test, direct shear test, etc. all require undisturbed soil samples. The soil is a three-phase system composed of solid matter, water and gas. The soil structure is relatively loose. Duri...

AI Technical Summary

Problems solved by technology

The soil is a three-phase system composed of solid matter, water and gas. The soil structure is relatively loose. During the sampling operation, sample packaging, storage, and transportation, it is easy to disturb and destroy its original structure system, resulting in the original state of the soil. Sampling is difficult, or even sampling fails

[0003] In the existing undisturbed soil sampling technology, the undisturbed soil sampler includes electric and manual methods, and the electric soil sampling device has not been widely promoted due to the limitation of field power supply and high price.

There are mainly two types of manual soil sampling devices: direct pressure type and rotary type. The rotary type sampling device often disturbs the soil due to the unstable axis of the sampling tube. The direct pressure type mainly hammers the sampling barrel to knock it out However, during the hammering process, due to the uneven application of force, the sampling bucket is prone to tilt and offset, and it is very easy to cause soil vibration and damage the original soil. There is a structural system, causing soil sampling failure

In the prior art, there is another method of directly placing a ring knife in the sampling device to take samples, which can avoid secondary disturbances. However, due to the thick wall of the ring knife, it will squeeze the surrounding soil when sampling, causing damage to the soil. Destruction of the original structural system

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