Pushing-out device and method for columnar sediment undisturbed samples

Abstract

The invention discloses a pushing-out device and method for columnar sediment undisturbed samples. The pushing-out device comprises a length-adjustable base, a fixing device, an electric device, a soil pushing device and a maintaining device. According to the samples of different lengths and diameters, the length of the base and a soil pushing rod of the soil pushing-out device is adjustable, and a sample tube counter-force ring, a fixing disc and a soil pushing disc can be replaced. The electric device of the soil pushing-out device is connected with a speed adjusting button and a protecting switch, a half-tube sample supporting table is a movable platform, the moving speed of the half-tube sample supporting table is uniform with the speed of the soil pushing rod or the pushing-out speed of the columnar sediments, and the soil pushing rod can be automatically cleaned and maintained through a cleaning device and an oil applying device. The pushing-out device is reasonable in structure, convenient to machine and manufacture, convenient to operate in usage and high in controllability, influences by human factors are small, disturbance on the columnar sediment undisturbed samples is small, and the pushing-out device and method are suitable for all kinds of sediment undisturbed samples and provide the reliable samples for research on the physical and mechanical properties of the sediment undisturbed samples or sedimentary environment evolution.

Description

technical field [0001] The invention relates to a device and method for pushing out undisturbed samples of columnar sediments, which are used to push out undisturbed sediment samples from sampling pipes, and maintain the original characteristics of the soil to the greatest extent, so as to carry out subsequent sediment analysis tests or rock and soil samples. Engineering property analysis test. Background technique [0002] At present, almost all geotechnical engineering surveys and sedimentary environment studies require on-site drilling to obtain undisturbed samples of columnar sediments at different depths, and obtain relevant data through laboratory tests, data analysis and processing, etc. Provide data support for design, construction and other scientific research. Therefore, the degree of disturbance to the undisturbed soil in the process of sampling and pushing directly determines the reliability of the test data. [0003] For pushing the undisturbed sample of colum...

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Problems solved by technology

[0004] The manual bulldozing method is not easy to control, the interference of human factors is large, and the labor intensity is high. When encountering dense soil, it is even impossible to push it out of the sampling pipe.

[0005] The traditional simple horizontal bulldozer has a simple structure and is mainly composed of a mechanical push-out device. Its speed cannot be adjusted, and it is only suitable for a fixed-diameter sampling tube within a certain length; after the sample is pushed out, it needs manual support and is easy to deform; Medium soil is easy to attach to the bulldozing rod, increasing the resistance will affect the screwing of the bulldozing rod; without protection device, the motor is easy to be overloaded and burned; for soil samples with high moisture content or long length, they are prone to deformation during the pushing process , resulting in disturbance of the undisturbed soil

[0006] The existing vertical bulldozer pushes out the undisturbed soil sample in the vertical direction, and pushes out one section and cuts one section. This method is suitable for medium-dense or dense cohesive soil and hard plastic cohesive soil. For loose cohesive soil and Soft plastic and flow-plastic cohesive soils are not suitable. The soil sample will be deformed and disturbed by its own gravity during the vertical pushing process, and it cannot be used for unconsolidated sediments on the shallow surface saturated with water in the marine environment.

At the same time, the method of cutting a section is introduced, which is not conducive to maintaining the overall characteristics of the columnar sediment samples, and brings inconvenience to the study of the depositional environment.

[0007] In summary, the existing bulldozers and bulldozing methods will disturb the undisturbed soil to varying degrees, which will affect the laboratory test and analysis data of soil samples, and cannot correctly reflect the physical and mechanical properties of the soil or the evolution of the depositional environment. feature

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