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Sample production method for disturbed soil for conventional triaxial test, and method thereof

A triaxial test, a conventional technology, applied in the measurement device, preparation of test samples, sampling, etc., can solve the problems of flexible adjustment of soil sample height-diameter ratio, inaccurate control of compactness, uneven soil sample preparation, etc. Real and reliable test results, precise control of compactness

Pending Publication Date: 2018-10-16
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the objectives of the present invention is to provide a conventional triaxial test disturbed soil sample device, which solves the problem that the height-to-diameter ratio of the soil sample cannot be flexibly adjusted according to the research needs, uneven soil sample preparation, and compactness control when the existing sample preparation device prepares samples. Inaccurate problem, another object of the present invention is to provide a kind of triaxial test disturbance soil sample method

Method used

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  • Sample production method for disturbed soil for conventional triaxial test, and method thereof
  • Sample production method for disturbed soil for conventional triaxial test, and method thereof
  • Sample production method for disturbed soil for conventional triaxial test, and method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Such as Figure 1-Figure 10 As shown, the conventional triaxial test disturbs the soil sample device, including the sample preparation cylinder and the compaction equipment set in the sample preparation cylinder.

[0057] The sample preparation cylinder includes a base 1, a lower casing 2, an upper casing 3, and a rubber mold 4. The lower casing 2 is placed on the base 1, and the upper part of the lower casing 2 is connected with the upper casing 3 to form the casing main body. Casing 3 can be stretched up and down along the lower casing 2 to adjust the total height of the casing main body. The front and back outer walls of the casing main body are provided with uniform scale lines 13 with a unit length of 1 mm. The zero scale line is located at the lower casing 3 At the lower end, the material of the sample preparation cylinder is transparent tempered glass. After the rubber mold 4 passes through the casing, it is close to the inner wall of the cylinder and the two end...

Embodiment 2

[0060] Taking disturbed cohesive soil as an example, the operation process of the triaxial test disturbed soil sample method using the conventional triaxial test disturbed soil sample device described in Example 1 is described:

[0061] Step 1: Equipment Installation

[0062] ① First, calculate the sample preparation height according to the sample height-to-diameter ratio and the soil sample diameter. If the height of the soil sample is less than or equal to the height of the lower casing 2, the lower casing 2 can be directly used to prepare the soil sample; otherwise, it should be combined with the upper casing 3. Make soil samples. Here is a more complicated situation, that is, the sample preparation process of the joint use of the upper casing 3 and the lower casing 2 is explained;

[0063] ②Connect the upper end of the lower casing 2 with the lower end of the upper casing 3 through internal and external threads, adjust the total height of the casing according to the sampl...

Embodiment 3

[0082] The structure and connection relationship of each part of the conventional triaxial test disturbed soil sample device described in this embodiment are the same as those in Embodiment 1, and the different technical parameters are:

[0083] 1) The diameter of the exhaust hole 5 is 1.7mm;

[0084] 2) The height of the base 10 is 3cm;

[0085] 3) The diameter of the hole is slightly larger than the outer diameter of the lower casing 2, and the difference between the two is 0.25mm;

[0086] 4) The cross-sectional diameter of the backing plate 11 is the same as that of the permeable stone 12 and slightly smaller than the diameter of the hole in the base 10, with a difference of 0.4 mm;

[0087] 5) The aspect ratio of the lower casing 2 is 2.2;

[0088] 6) The wall thickness of the lower casing 2 is 1.2mm;

[0089] 7) The wall thickness of the upper casing 3 is 0.7mm;

[0090] 8) The lower end of the upper hollow rod 15 of the dowel 6 is slightly above the position to open...

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Abstract

The invention belongs to the technical field of geotechnical engineering indoor test apparatuses, and particularly relates to a ample production method for disturbed soil for conventional triaxial test, and a method thereof. The apparatus comprises a sample production cylinder and a compacting device, the sample production cylinder comprises a base, an upper protection cylinder and a lower protection cylinder, the upper protection cylinder can be telescoped along the lower protection cylinder to adjust the total height of the upper protection cylinder and the lower protection cylinder, the outer wall of each of the upper protection cylinder and the lower protection cylinder is provided with is a uniform scale line, the sample production cylinder is made of transparent tempered glass, a rubber mold goes through the protection cylinders and then cling to to the inner walls of the cylindrical shells of the protection cylinders, two ends of the rubber mold sleeve the outer walls of the protection cylinders and the base, and the wall of every protection cylinder is provided with vent holes to realize vacuumizing of a gap between the inner walls and the rubber mold. The compacting deviceis made of a stainless steel, and includes a force transmitting rod, a compacting hammer and a shaving blade, the lower solid rod of the force transmitting rod can be telescoped in the upper hollow rod of the force transmitting rod, and the total length of the force transmitting rod can be adjusted by a stopper. The apparatus and the method have the advantages of flexibility in adjustment of theheight-diameter ratio of a soil sample during sample production, visualization of the whole process, accuracy in control of soil sample paving and compacting, and simple test operation process, and can be promoted in the technical field of geotechnical test.

Description

technical field [0001] The invention belongs to the technical field of indoor test equipment for geotechnical engineering, and in particular relates to a disturbed soil sampling device and method for a conventional triaxial test. Background technique [0002] Indoor conventional triaxial tests are widely used in the study of soil mechanical properties, including the determination of soil shear strength parameters (cohesion and internal friction angle), and the acquisition of soil stress-strain relationship curves and dilation properties. For disturbed soil, the key to the test operation lies in the preparation of the soil sample. If the obtained soil sample is not uniform, the preparation process is difficult to control accurately, the aspect ratio of the soil sample is too small, or it is difficult to flexibly adjust according to the research needs, the test results will be affected. The value of this test cannot be realized due to the large difference from the real stress-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/286
Inventor 胡成宝张金生凌道盛孙小峰成雪平陈俊叶风舞
Owner ZHEJIANG UNIV
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