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Triaxial shearing and seepage integrated experimental method for hydrate-containing sediments

A hydrate-containing, triaxial shearing technique for testing material strength, permeability/surface area analysis, instrumentation, etc. using a stable shear force applied

Active Publication Date: 2021-04-27
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although there are many mechanical equipment and seepage equipment for geotechnical experiments, there are very few equipment that are specially used for hydrate-containing sediments and can consider the interaction of stress and seepage at the same time.
In particular, the gas and liquid seepage experiments in the triaxial shearing process of the sample, that is, the failure process, cannot be carried out, which brings great limitations to the integrated triaxial shearing and seepage experiments of hydrate-containing sediments.

Method used

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  • Triaxial shearing and seepage integrated experimental method for hydrate-containing sediments
  • Triaxial shearing and seepage integrated experimental method for hydrate-containing sediments
  • Triaxial shearing and seepage integrated experimental method for hydrate-containing sediments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] An integrated experimental setup, including a triaxial pressure chamber 31, such as figure 2 and Figure 5 As shown, outside the triaxial pressure chamber 31 is a triaxial pressure chamber cover 29, which is fixed to the sample base 23 by the triaxial instrument cover nut 49 and the triaxial instrument cover bolt 50; image 3 As shown, the sample base 23 is provided with a week of through holes, the through holes are alternately arranged sample base seepage holes 26 and sample base air inlet holes 27, the sample base seepage holes 26 are connected with the seepage inlet pipe 48, and the sample base The air inlet hole 27 of the base is connected with the pore pressure inlet pipe 41, and communicates with the sample 52 through the two through holes, and the seepage inlet pipe 48 is provided with a seepage inlet pressure sensor 25 to monitor the seepage inlet pressure; in the sample base 23 Also be provided with groove, the sample base pressure sensor 56 is installed in ...

Embodiment 2

[0061] The seepage hole 26 of the adjacent sample base and the air inlet hole 27 of the sample base are arranged at an angle of 45°; the seepage holes 28 of the adjacent sample cap are arranged at an angle of 90°. In order to ensure that the pressure difference in the seepage process is stable, the pressure difference is evenly distributed, and the permeability is good, the seepage holes 26 of the sample base, the air inlet holes 27 of the sample base and the seepage holes 28 of the sample cap in the present invention have multiple and evenly distributed, such as image 3 and Figure 4 shown; and the central angle formed between the air inlet hole 27 of the sample base and the seepage hole 26 of the sample base is 45 °, as image 3 Shown; The central angle formed between the seepage holes 28 of the sample cap is 90°.

[0062] All the other are identical with embodiment 1.

Embodiment 3

[0064] A first valve 4-1 is provided between the methane pressure regulating valve 3-1 and the methane gas storage tank 5, and a twelfth valve 4-12 is provided between the nitrogen pressure regulating valve 3-2 and the nitrogen gas storage tank 6; A second valve 4-2 is provided between the gas storage tank 5 and the pore pressure controller 7; a third valve 4-3 is provided between the pore pressure controller 7 and the air inlet 27 of the sample base; the confining pressure inlet pipe 40 is provided with a fourth valve 4-4; a fifth valve 4-5 is provided between the fuel tank 11 and the confining pressure controller 9; A sixth valve 4-6 is provided in the main pipeline after the pipeline of the controller 8 and the seepage hole 26 of the sample base is merged; a ninth valve 4-6 is provided on the sub-pipeline between the liquid seepage pressure controller 10 and the seepage hole 26 of the sample base 9. An eighth valve 4-8 is provided on the branch line between the nitrogen see...

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Abstract

The invention belongs to the technical field of geotechnical experiments, and particularly relates to a triaxial shearing and seepage integrated experimental method for hydrate-containing sediments. The method comprises the following steps: (1) generating hydrate; (2) preparing a shearing and seepage coupling experiment; (3) carrying out an experiment. The special integrated experimental device is utilized, seepage and stress coupling analysis in the hydrate triaxial shear failure process can be achieved, and different seepage experiments of liquid and gas and liquid can be achieved.

Description

Technical field: [0001] The invention belongs to the technical field of geotechnical experiments, and in particular relates to an integrated experiment method of triaxial shearing and seepage of hydrate-containing sediments. Background technique: [0002] As a new type of energy, natural gas hydrate is widely distributed in major oceans and terrestrial permafrost areas around the world. Due to its large reserves, wide distribution, and no pollution, it is widely regarded as an alternative energy source in the 21st century. However, when hydrates are mined, the decomposition of hydrates will produce a large amount of gas, and its cementation will disappear and produce excess pore pressure, which will cause changes in the mechanical properties and strength reduction of hydrate-containing sediments, and eventually induce a series of problems. Large-scale geological disasters; as an inherent attribute of hydrate-bearing sediments, permeability characteristics are an important ba...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N3/24G01N3/02G01N13/04G01N15/08
CPCG01N3/12G01N3/24G01N3/02G01N13/04G01N15/0806G01N2203/0025G01N2203/0256G01N15/0826G01N33/241
Inventor 孔亮赵亚鹏许锐刘佳棋贺可强花丽坤
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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