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Triaxial shear test system of soil sample and drainage consolidation method thereof

A technology of triaxial shearing and soil samples, which is applied in the direction of applying stable shear force to test the strength of materials, surveying of on-site foundation soil, construction, etc., can solve the impact of progress or economic benefits, can not meet the needs of engineering projects, increase Drainage consolidation time and other issues, to achieve the effect of shortening the drainage consolidation time, providing economic benefits, and facilitating the progress of the project

Active Publication Date: 2010-07-14
CHEM IND GEOTECHN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, no matter in terms of progress or economics, the requirements of the engineering project cannot be met, and it will have a greater impact on the progress or economic benefits of the entire geotechnical engineering investigation project.
[0010] In addition, when the sample is drained and consolidated in the existing device, the drainage is carried out in one direction, which will greatly increase the time of drainage and consolidation, and the test is time-consuming Many, low work efficiency

Method used

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  • Triaxial shear test system of soil sample and drainage consolidation method thereof
  • Triaxial shear test system of soil sample and drainage consolidation method thereof
  • Triaxial shear test system of soil sample and drainage consolidation method thereof

Examples

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Embodiment 1

[0028] The soil sample in this embodiment is silt, the sample is first placed on the sample holder 106, and then the drain valve 35 on the drain pipe 33 is adjusted so that the water surface in the drain pipe 39 is flush with the central height A of the sample . Then adjust the pore pressure valve 36 so that the water surface in the pore pressure measuring tube 39 is equal to the height A of the center of the sample. Then adjust the pressure in the pressure chamber to reach the required ambient pressure value σ by adjusting the main pressure regulating valve 2, the corresponding sub-pressure regulating valve 3 and the surrounding pressure valve 10 3 . At this time, open the pore pressure valve 36, and when the pore water pressure is stable, the pore water pressure σ can be measured by the pore water pressure measuring instrument 37 k . After measuring the pore water pressure σ k Finally, close the pore pressure valve 36, open the drain valve 34 on the other branch connecte...

Embodiment 2

[0030] The soil sample in this embodiment is silty clay, and the process of drainage consolidation is the same as that of Example 1, except that the drainage consolidation time is different, which is slightly longer than 4.5 hours.

Embodiment 3

[0032] The soil sample in this embodiment is clay, and the process of drainage and consolidation is the same as in Example 1, except that the drainage and consolidation time is different, the longest being 6 hours.

[0033] The inventor of the present invention is based on relevant theories and many years of test experience, and the completion of drainage consolidation is defined by the sample properties with time, so that the pore water pressure in the middle process that has no great influence on the drainage consolidation judgment can be omitted, simplifying the operation process. At the same time, it adopts the two-way drainage method of drainage pipe and pore pressure pipe at the same time, and simultaneously drains and consolidates up to dozens of samples at one time, thus greatly improving the work efficiency of drainage and consolidation. This method can reduce a lot of workload, save costs, reduce the influence of human factors, simple and easy, and the test quality i...

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Abstract

The invention relates to a drainage consolidation method of a triaxial shear test of a soil sample. The triaxial shear test system of the invention comprises a triaxial shear tester, a pore water pressure measurement device and a peripheral pressure device, wherein a pore pressure buret and a draining buret are in parallel connection with a pore pressure pipe; the peripheral pressure device comprises an air pressure pump, a master pressure-regulating air valve, a sub-pressure-regulating air valve, a peripheral pressure valve, a master air inlet pipe and a plurality of sub-air inlet pipes, burets and a water outlet pipe, wherein a plurality of burets are positioned in parallel, and one end of each air inlet pipe is connected with the upper end of the corresponding buret. The draining consolidation method comprises the following steps: ensuring that the water surface in the draining buret and the pore pressure buret and the center height of the sample are at the same level; adjusting peripheral pressure to a needed value sigma 3, performing draining consolidation; after performing drainage consolidation for 3-6 hours, measuring and recording pore water pressure every one hour until the pore water pressure is reduced to 5% of the pore water pressure value sigma k which is measured originally, and finishing drainage consolidation. The method of the invention has the advantages of effectively shortening the draining consolidation time in the shear test and accelerating the engineering project.

Description

technical field [0001] The invention relates to the measurement of building foundations, in particular to a triaxial shear test system and a drainage fixing method for soil samples used for measuring the shear strength of foundation soil. Background technique [0002] The indoor triaxial shear test system is used for shear tests on soil samples to obtain the shear strength index of the soil. This index will be used in the foundation design of various engineering construction projects and the prevention and treatment of geological disasters such as debris flows and landslides. [0003] Most of the current triaxial shear test systems such as figure 1 As shown, it is mainly composed of a strain-controlled triaxial instrument 100 , an axial pressure device (not shown), a surrounding pressure device 200 and a pore water pressure measurement device 300 . In addition to a pore water pressure measuring device 300 , the triaxial instrument 100 is also equipped with a corresponding ...

Claims

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Application Information

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IPC IPC(8): E02D1/00G01N3/24
Inventor 张锦成
Owner CHEM IND GEOTECHN ENG
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