Sampling and curing system and method for undisturbed sandy soil

Abstract

The invention discloses a sampling and curing system and method for undisturbed sandy soil. The system comprises a sampling support, a sampling pipe, a permeation cylinder, a storage cylinder and a curing oven, and the curing oven is used for curing an undisturbed sand sample; a top pipe opening is formed in the top of the sampling pipe, a bottom pipe opening is formed in the bottom of the sampling pipe, the sampling support comprises a vertical rod assembly and a U-shaped clamping assembly, the vertical rod assembly comprises two vertical rods, a bearing steel sheet is fixedly connected between the bottoms of the two vertical rods, a transverse rod is connected between the top ends of the two vertical rods through screws, and the sampling pipe is assembled on the U-shaped clamping assembly in a matched mode; and a through hole bracket is mounted in the permeation cylinder; a connecting pipe is communicated between the bottom of the storage cylinder and the bottom of the permeation cylinder. The bottom pipe orifice of the sampling pipe is vertically inserted into the sandy soil, and then cut-off sampling is performed through the bearing steel sheet of the sampling bracket, so that the mobile operation is convenient; and the prepared temperature-sensitive resin is used for filling and curing the pores of the taken-out undisturbed sand sample, so that the undisturbed sand sample which is not influenced by disturbance and can be stored for a long time is obtained.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering geotechnical tests, in particular to a sampling and curing system and method for undisturbed sandy soil. Background technique [0002] There are significant differences in mechanical properties between undisturbed sand and remolded sand. In order to better understand the internal mesoscopic fabric characteristics of natural sand and its influence, it is necessary to sample and preserve undisturbed sand. However, taking undisturbed samples from deeply buried, loose, flowing, and weathered sand layers, and the long-term preservation of undisturbed samples have always been a remaining technical problem. At present, for the sampling and preservation of undisturbed sand and soil, most of them use the undisturbed sand collector to take out the sand, then put the sample into a moisturizing cylinder with dry ice and freeze it, and transport the sample back to the laboratory in the frozen ...

AI Technical Summary

Problems solved by technology

This method is inconvenient to operate in the whole process, and the freezing process is easy to make the undisturbed sand heave and destroy the original internal structure; at the same time, it is necessary to cut the undisturbed sand sample during the indoor rock and soil mesoscopic test analysis. During the pre-treatment work, the sand sample will be thawed, and it is easy to cause the sand sample to deform

Therefore, the existing devices cannot effectively provide undisturbed sand samples that are not afraid of disturbance, can be cut arbitrarily, and can be stored for a long time for sand mesoscopic tests.

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