Three-axis test sample preparation device of low-strength microorganism calcareous sand and application method thereof

A technology of triaxial sample and microorganism, which is applied in the field of civil engineering test, can solve the problems of disturbance and destruction of calcareous sandy soil reinforced by microorganisms, and achieve the effect of good reinforcement uniformity and improved utilization rate

Active Publication Date: 2017-05-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a sample preparation device suitable for microbial treatment of low-strength soil static and dynamic triaxial tests and i

Method used

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  • Three-axis test sample preparation device of low-strength microorganism calcareous sand and application method thereof
  • Three-axis test sample preparation device of low-strength microorganism calcareous sand and application method thereof
  • Three-axis test sample preparation device of low-strength microorganism calcareous sand and application method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A triaxial sample preparation device for low-strength microbial calcareous sand, comprising a mold cylinder, a triaxial base 6 and a compactor 5.

[0041] see figure 1 , the mold barrel includes a split cylinder 1, a latex stopper 4 and a lower sample cap 2.

[0042] The split cylinder 1 uses transparent PVC material. The split cylinder 1 is provided with a scale. The split cylinder 1 can be split axially symmetrically into a split mold I 101 and a split mold II 102 . The split mold I 101 and the split mold II 102 can be tightly combined. see image 3, rubber sealing strips 106 are pasted on the splicing surfaces of the split mold I 101 and the split mold II 102. Annular groove I 103 and annular groove II 104 are formed on the inner wall of the split cylinder 1 . The annular groove I 103 is located at the upper part of the split cylinder 1 . The annular groove II 104 is located at the lower part of the split cylinder 1 . A through hole 105 is opened on the side ...

Embodiment 2

[0047] This embodiment discloses a method for using the low-strength microbial calcareous sand triaxial sample preparation device described in Embodiment 1, including the following steps:

[0048] 1) Fix the rubber membrane 7 on the lower sample cap 2 with the rubber ring 8 .

[0049] 2) Put the split mold I101 and split mold II102 on the outer surface of the rubber film, the rubber ring 8 snaps into the annular groove II104, and use the clamp ring sleeve 3 to firmly fix the split mold I101 and the split mold II102 together , and then slowly turn over the rubber film 7 from the opposite cylinder 1.

[0050] 3) Use a vacuum pump to pump air through the through hole 105, so that the rubber film 7 is close to the inner wall of the mold cylinder.

[0051] 4) Lay filter paper 9 in the mold cylinder. Calculate the total weight of the sample according to the relative compactness and volume, and then divide the sample into several parts. The sand rain method is used to load samples...

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Abstract

The invention discloses a three-axis test sample preparation device of low-strength microorganism calcareous sand and an application method thereof. A sample preparation device assembly comprises a mold barrel, a three-axis instrument base and a compaction device. The mold barrel comprises two pieces of splitting molds, a lower test sample cap and a rubber plug. Upper and lower ends of the mold barrel are matched with the rubber plug and the lower test sample cap respectively. The two pieces of splitting molds are hooped through a tightening ring sleeve. A rubber sealing strip is stuck on a vertical section of each splitting mold. Each splitting mold is provided with an exhausting hole. No squeezing disturbance on the test sample is caused by preparation, sampling and sample filling processes of microorganism soil, and reliable static and dynamic characteristic parameters of the low-strength microorganism calcareous sand can be obtained. The application method of the test sample preparation device comprises the steps of assembling the mold barrel, filling a sand soil sample, grouting and reinforcing microorganisms, mounting and removing the mold barrel on a three-axis instrument and the like.

Description

technical field [0001] The invention relates to the technical field of civil engineering tests, in particular to a low-strength microbial calcareous sand triaxial sample preparation device and a use method. Background technique [0002] Calcareous sand is a special rock-soil medium of marine biogenesis, which is widely distributed in the South my country Sea. As a natural foundation, calcareous sandy soil is mostly only found in civil and national defense projects in the South China Sea. It is characterized by low requirements for foundation bearing capacity and small building loads. As my country puts forward the strategic goal of "building a powerful ocean country", my country will vigorously carry out the development and construction of the South China Sea islands, including docks, airport runways, and various civilian and military buildings. During the construction, it is inevitable to encounter calcareous sand foundation problems. A large number of tests and engineerin...

Claims

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Application Information

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IPC IPC(8): G01N1/28
Inventor 刘汉龙肖鹏楚剑肖杨刘璐丁选明
Owner CHONGQING UNIV
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