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Sampling and curing system and method for undisturbed sandy soil

An undisturbed, sandy soil technology, applied in the field of geotechnical engineering geotechnical testing, can solve the problems of undisturbed sandy soil frost heaving, inconvenient operation, damage to the internal structure, etc.

Pending Publication Date: 2021-08-20
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Sampling and curing system and method for undisturbed sandy soil
  • Sampling and curing system and method for undisturbed sandy soil
  • Sampling and curing system and method for undisturbed sandy soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0032] like Figure 1 to Figure 6 As shown, a sampling and curing system for undisturbed sand includes a sampling bracket, a sampling pipe 13, a permeation cylinder 3, a storage cylinder 19 and a curing oven, which is used for curing undisturbed sand samples. The top of the sampling tube 13 has a top nozzle 131, and the bottom of the sampling tube 13 has a bottom nozzle 132. The sampling support includes a pole assembly and a U-shaped clamp assembly installed on the pole assembly. The pole assembly includes two mutually parallel Upright poles 11, bearing steel sheets 6 are fixedly connected between the bottoms of the two upright poles 11, crossbars 2 are connected by screws 1 between the tops of the two upright poles 11, and the sampling tube 13 is matched and assembled on the U-shaped clamp assembly. A through-hole bracket 7 is installed inside the permeation cylinder 3 , and the sampling bracket and the sampling tube 13 are placed on the through-hole bracket 7 in the permeat...

Embodiment 1

[0044] A kind of sampling curing method of undisturbed sandy soil, its method is as follows:

[0045] A. According to figure 1 Connect the sampling and curing system as shown, select an undisturbed area, dig out the sandy soil on the surface, and then dig down 20-30cm to start sampling. Use a scraper to scrape the surface of the sand, vertically and slowly press the nozzle 132 at the bottom of the sampling tube 13 into the sand carefully, take the original sand sample 14 from the sampling tube 13, and the pressing depth is the sampling height, and the pressing depth is specific according to the test. Ask to be sure.

[0046] B. Gently scrape off the sand around the sampling tube 13 with a thin blade knife, place the bearing steel sheet 6 of the sampling bracket directly below the bottom nozzle 132, and then attach the bearing steel sheet 6 at the bottom of the sampling bracket to the sampling tube 13 Slowly push the bottom of the sampling bracket horizontally so that the bea...

Embodiment 2

[0051] A kind of sampling curing method of undisturbed sandy soil, its method is as follows:

[0052] A. Select an undisturbed area, dig out the surface sand, and then dig down 20-30cm to start sampling. Use a scraper to scrape the surface of the sand and soil, vertically and slowly press the bottom nozzle 132 of the sampling tube 13 into the sand and soil (the wall thickness of the sampling tube 13 is 0.5mm, and the internal diameter of the sampling tube 13 is 59mm), the sampling tube 13 Take the undisturbed sand sample 14 (silty fine sand), and the indentation depth is 3-4cm.

[0053] B. Scrape away the sand and soil around the sampling pipe 13 gently with a sheet knife, and place the bearing steel sheet 6 of the sampling support (the bearing steel sheet 6 is a stainless steel 304 thin steel sheet with a thickness of 0.2 mm) directly below the bottom nozzle 132 , and then the bearing steel sheet 6 at the bottom of the sampling bracket is closely attached to the bottom of th...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/08G01N1/10G01N1/36G01N1/44
CPCG01N1/08G01N1/10G01N1/36G01N1/44G01N2001/1006G01N2001/364
Inventor 王勇闫锴刘观仕王晓海汪晔欢
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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