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Large direct shear test sample preparation device for microorganism reinforced coarse-grained soil and use method thereof

A technology of microorganisms and coarse-grained soils, which is used in measuring devices, preparation of samples for testing, and testing the strength of materials by applying a stable shear force. Reinforcement degree evaluation, reinforcement design deviation and other issues, to achieve the effect of convenient assembly and separation, good uniformity and integrity, and ensure integrity

Pending Publication Date: 2020-05-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bonding strength of microbial reinforcement is much lower than that of cement mixture, and it is difficult to sample on site
According to the conventional thinking, microbial reinforcement is carried out in the large-scale direct shear sample box first, and the strength of the cemented body is sheared after the reinforcement is completed. However, due to microbial reinforcement, by-products of corroding metal will be produced, which will damage the sample box, and the generated rust will be filled in the The determination of the shear strength is affected by the relationship between the soil sample and the sample, resulting in deviations in the field reinforcement design
In addition, the degree of microbial reinforcement needs to be evaluated before the test, and the traditional direct shear test sample preparation device cannot be used for large-scale direct shear tests on microbial cements, nor can it evaluate the degree of reinforcement. Sample preparation device for direct shear test

Method used

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  • Large direct shear test sample preparation device for microorganism reinforced coarse-grained soil and use method thereof
  • Large direct shear test sample preparation device for microorganism reinforced coarse-grained soil and use method thereof
  • Large direct shear test sample preparation device for microorganism reinforced coarse-grained soil and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047]This embodiment discloses a large-scale direct shear test sample preparation device for microbial reinforcement of coarse-grained soil, including a device base 1, a sample base 2, a mold cylinder 3, a casing 6, a grouting pipe 7, a bending element sensor 8, a peristaltic A pump 10, a microbial solution pool 11 and a reaction liquid pool 12.

[0048] see figure 1 , the specification of the device base 1 is the same as that of the direct shear instrument base, and the device base 1 is fixed by bolts. A sample holder base 2 is installed on the base 1 of the device, and a mold cylinder 3 is installed on the sample holder base 2 . The mold barrel 3 is a cylinder with an open upper end and a hollow interior, and the cylinder is formed by splicing two split molds 301 . The inside of the mold cylinder 3 is filled with coarse-grained soil 5 , and the vibrator 18 vibrates the coarse-grained soil 5 in layers. see Image 6 , is a schematic diagram of the vibrator 18.

[0049] s...

Embodiment 2

[0060] The using method of the large-scale direct shear test sample preparation device based on a kind of microbial reinforcement coarse-grained soil described in embodiment 1 may further comprise the steps:

[0061] 1) The original base of the direct shear instrument is removed, the device base 1 is fixed on the direct shear instrument by bolts, and the sample holder base 2 is installed on the device base 1 .

[0062] 2) The two split molds 301 are fixed on the sample base 2 by M6 bolts, and the fixing plates 3011 on the two split molds 301 are connected by bolts and then sealed with a sealant to complete the assembly of the mold cylinder 3 .

[0063] 3) Place the three sleeves 6 vertically at predetermined positions in the mold cylinder 3, prepare coarse-grained soil 5 according to the predetermined gradation and mix them evenly, and put them into layers between the sleeves 6 and the mold cylinder 3, each layer The soil sample is compacted with a vibrator 18, and the surface...

Embodiment 3

[0076] This embodiment discloses a large-scale direct shear test sample preparation device for microbial reinforcement of coarse-grained soil, including a device base 1, a sample base 2, a mold cylinder 3, a casing 6, a grouting pipe 7, a bending element sensor 8, a peristaltic A pump 10, a microbial solution pool 11 and a reaction liquid pool 12.

[0077] see figure 1 , the device base 1 is installed on the direct shear instrument, the device base 1 is installed with a sample base 2, and the sample base 2 is equipped with a mold cylinder 3. see figure 2 , the outer wall of the mold cylinder 3 is provided with a number of bending element sensors 8, and the lower end of the mold cylinder 3 is provided with a number of drain pipes 4 penetrating through its side wall.

[0078] see figure 1 Or 2, the inside of the mold cylinder 3 is provided with several sleeves 6 vertically, the upper end of the sleeve 6 is open, and the lower end is closed, and the tube wall of the sleeve 6 ...

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Abstract

The invention discloses a large direct shear test sample preparation device for microorganism reinforced coarse-grained soil and a use method thereof. The large direct shear test sample preparation device comprises a device base, a mold cylinder, sleeves, grouting pipes and bending element sensors. The device base is installed on a direct shear apparatus, and the mold cylinder is installed on thedevice base. A plurality of bending element sensors are arranged on the outer wall of the mold cylinder, and a plurality of drain pipes penetrating the side wall of the mold cylinder are arranged at the lower end of the mold cylinder. A plurality of sleeves are vertically arranged in the mold cylinder, a plurality of through holes are formed in the sleeves, and the space between the sleeves and the mold cylinder is filled with coarse-grained soil. The lower ends of a plurality of grouting pipes are inserted into the corresponding sleeves, the upper ends of the grouting pipes are connected withliquid guide pipes, and the liquid guide pipes are connected with a microbial solution pool and a reaction liquid pool. The device is convenient to assemble and separate, can be used for preparing coarse-grained soil with a large particle size range and has strong operability; the utilization rate of reaction liquid is increased by adopting a method of combining saturated grouting and standing reaction.

Description

technical field [0001] The invention relates to the technical field of foundation treatment, in particular to a large-scale direct shear test sample preparation device and a use method for microbial reinforcement of coarse-grained soil. Background technique [0002] Coarse-grained soil is widely distributed in my country, and its particle size range is generally 0.075-60mm. The coarse-grained soil foundation or slope has loose particles, large particle size, poor erosion resistance, and poor physical and mechanical properties. Coarse-grained soils are prone to instability under complex stress conditions, causing landslides, debris flows and other disasters. In engineering construction, it is necessary to evaluate the shear strength of coarse-grained soil. Conventional shear strength tests such as triaxial, torsional shear, and direct shear have relatively high requirements for the maximum particle size of the particles due to the small size of the sample (generally speaking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/36G01N1/28G01N3/24
CPCG01N1/36G01N1/286G01N1/28G01N3/24G01N2001/366G01N2203/0266G01N2203/0298
Inventor 孙增春肖杨孙越孟敏强何想
Owner CHONGQING UNIV
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