Joint geotechnical triaxial test sample preparation method

A triaxial test and rational technology, applied in the preparation of test samples, using stable tension/pressure to test the strength of materials, etc., can solve the problem that it is impossible to make triaxial samples with joints, and it is impossible to make jointed samples, etc. problem, to achieve the effect of improving efficiency and accuracy

Active Publication Date: 2017-09-08
SEISMOLOGICAL BUREAU OF GANSU PROVINCE CHINA EARTHQUAKE ADMINISTRATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are two traditional methods for making triaxial test specimens, that is, "three-layer compaction method" to reshape samples and "static pressing method", but none of them can make triaxial specimens with joints, let alone Produce joint samples with different inclination angles

Method used

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Embodiment 1

[0031] The concrete steps of joint rational geotechnical triaxial test sample preparation method of the present invention are as follows:

[0032] Step S1. Determine the joint-related data of the target sample, and calculate the mass of soil material required for each sub-sample according to the volume of each sub-sample in the target sample and the preset sample density.

[0033] In practical applications, it is usually the design drawing or idea of ​​the existing target sample (the final desired sample), through which the number of joints in the target sample and the position information of each joint can be determined Joint-related data such as inclination information, such as a through-type horizontal joint located in the middle, two uniformly distributed and parallel 45° inclination joints, it can be understood that the target sample is composed of sub-samples divided by each joint, If the target sample has a penetrating joint, then it has two sub-samples; when the joint ...

Embodiment 2

[0049] Example 2 Horizontal joints

[0050] refer to figure 2 , the target sample contains a through-type horizontal joint, and the joint position is at a height of 20mm or 60mm. Therefore, two 1# blocks are selected as molded test blocks. The manufacturing process is as follows:

[0051] (1) Before sample preparation, first calculate the volume V1 of the sample soil below the joint according to the preset joint position, and calculate the mass m1 according to the volume V1 and the preset sample density ρ1, and weigh m1 mass with an electronic scale soil.

[0052] (2) if figure 2 As shown in middle (a), place the lower support column at the bottom of sleeve 2, then pour m1 mass of soil into the sample in the middle, that is, the sample in the figure, and then place two 1# blocks and the upper support column on the soil sample respectively directly above, and then put the sleeve 2 on the oil pump 4 as a whole, put the top cover 1 under the round hole on the top of the reac...

Embodiment 345

[0056] Example 3 45° inclination joint

[0057] refer to image 3 , the target sample contains a through-type joint with an inclination angle of 45°, and the joint extends upward from the bottom of the target sample at an angle of 45°, so one 2# block, two 5# blocks and two 1# blocks are selected for combination Form the molded test block to make the first sub-sample, and refer to Example 1 for the details of the rest of the manufacturing process. Moreover, under the combination of 1# block, 2# block, and 5# block, up to 4 parallel joints with an inclination angle of 45° can be made, and the joint spacing is 10mm.

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Abstract

The invention relates to a joint geotechnical triaxial test sample preparation method. Due to the fact that a target sample is composed of child samples divided through joints, the joint geotechnical triaxial test sample preparation method comprises selecting a first child sample in an edge position, and selecting mold test blocks identical in shape and size to other child samples, wherein the mold test blocks are single blocks or combined blocks; placing the mold test blocks and soil materials in position into a mold sleeve and performing compression; extracting shaped samples and taking the samples as mold test blocks, repeating the steps above to manufacture a next child sample neighboring to the first child sample until manufacturing the target sample. During the manufacturing processes, deburring treatment on the natural contact surfaces where the joints among the child samples are positioned is saved, namely, every pair of natural contact surface can serve as joint surfaces. By means of a static-pressure layered manufacturing mode and through different combination of the mold test blocks, the joint geotechnical triaxial test sample preparation method can be applied to manufacturing through type or non-through type joint samples with different inclinations ranging between 0 and 90 degrees and different numbers of joints.

Description

technical field [0001] The invention relates to the technical field of making jointed samples, in particular to a method for preparing samples for jointed geotechnical triaxial tests. Background technique [0002] Joints are widely distributed in loess. The existence of joints provides a channel for rainfall to infiltrate through shallow loess to deep loess. However, this can easily lead to instability of the loess structure with strong collapsibility and reduce the stability of the slope. Therefore, the physical and mechanical properties of jointed loess have attracted extensive attention from the academic and engineering circles. [0003] Due to the extremely low tensile strength of the joint surface, the joint surface is easily cracked during field sampling and indoor test sample cutting, which affects the test process and the success rate of the test. Therefore, it is very important to explore a method and sample preparation device for reshaping artificially made jointe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N3/08
Inventor 王丽丽梁庆国孙文王峻王平王谦夏坤董林
Owner SEISMOLOGICAL BUREAU OF GANSU PROVINCE CHINA EARTHQUAKE ADMINISTRATION
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