Undisturbed soil sampler with soil sample easy to demold and small in disturbance and soil sampling method thereof

Abstract

The invention provides an undisturbed soil sampler with a soil sample easy to demold and small in disturbance. The soil sampler comprises a soil sampling barrel with a cylindrical soil sampling cavityand a pipe shoe, wherein the pipe shoe is installed at the bottom end of the soil sampling barrel, the inner diameter of the pipe shoe is smaller than that of the soil sampling barrel, the soil sampling barrel is formed by splicing at least two arc-shaped pipe pieces, the top of the soil sampling barrel is connected with a top cover, the top of the top cover is connected with a dowel bar, and thedowel bar is located on the axis of the soil sampling barrel. The invention further provides a soil sampling method of the undisturbed soil sampler with the soil sample easy to demold and small in disturbance. The Undisturbed soil sampler with the soil sample easy to demold and small in disturbance and the soil sampling method thereofhavethe beneficial effects that the problems that a soil samplein a traditional soil sampler is difficult to take out from the soil sampling barrel and the disturbance to the soil sample is large are solved.

Description

technical field [0001] The invention relates to a soil fetcher, in particular to an undisturbed soil fetcher and a soil fetching method which are easy to release soil samples and have little disturbance. Background technique [0002] On-site sampling for geotechnical experiments is an essential link in geotechnical engineering, and the soil extractor is the key equipment for taking undisturbed soil on site in geological exploration. Soil disturbance, so that more reliable soil parameters can be obtained through indoor tests, thus providing valuable reference for engineering design. [0003] The traditional undisturbed soil sampling is mostly to drill the drilling equipment to a specified depth, retrieve a large rough soil sample, and then transport it to the laboratory. The experimenter then cuts the soil sample with a soil cutter and wire saw to obtain a rough soil sample, and then puts it into the designated triaxial sample soil trimmer for fine cutting, so as to achieve ...

AI Technical Summary

Problems solved by technology

The traditional method takes the rough sample and transports it back to the laboratory, and then finely cuts it with a soil repair tool; the disadvantage of this method is that the size of the artificially cut soil sample is not standard, which is time-consuming and laborious

However, the main disadvantage of the deep undisturbed soil fetcher listed above is that the soil fetcher enters the soil layer by manually twisting the handle, and it is difficult to ensure that the applied force is vertically downward along the force bar, so that the soil fetcher may occur during the sampling process. The deflection causes the sampling direction to be non-vertical; and the static triaxial in-situ soil fetcher for soft soil, when sampling in soft and hard uneven strata and strata with high water content, due to the inner diameter of the soil fetcher and the inner diameter of the pipe shoe at the bottom Similarly, after the soil is taken, the soil sample will stick to the inner wall of the soil extractor or even stick to the inner wall of the soil extractor, making it difficult to take the soil sample out of the soil extractor cavity. During the sampling and demoulding process, the inner wall of the sampling cylinder and the surface of the soil sample will rub The force is large, and the soil sample is greatly disturbed, and even the waist of the sample may bulge outward, and it may also appear in the process of pressing down on the soil fetcher, due to uneven force, an eccentric force is generated, causing the soil fetcher to produce lateral displacement; However, the conventional triaxial test earth taker for geotechnical engineering also generally has the problem of difficult demoulding after sampling.

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