Device and method for clay core wall hydraulic fracturing experiments

A technology of hydraulic splitting and clay core wall, which is applied in the direction of applying stable tension/pressure to test the strength of materials and preparation of samples for testing, etc.

Active Publication Date: 2013-11-13
HOHAI UNIV
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Problems solved by technology

[0004] The present invention aims at the defects of the existing earth-rock dam core wall hydraulic splitting test device, and proposes a clay core wall hydraulic splitting test device and test method that can simulate coupling conditions, which can more truly reflect the characteristics and impact of the clay core wall. Force conditions and influencing factors

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  • Device and method for clay core wall hydraulic fracturing experiments
  • Device and method for clay core wall hydraulic fracturing experiments
  • Device and method for clay core wall hydraulic fracturing experiments

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0028] A test device for hydraulic splitting of a clay core wall, including a pressure chamber top cover (8), a rigid cylinder (13), a pressure chamber base (25) for supporting the upper structure, and a clay sample (12) inside for applying A sleeve (14) for internal water pressure, a sleeve slot (20), and a water-through copper pipe (10) for controlling the temperature of the pressure chamber, etc.

[0029] The pressure chamber top cover (8) is provided with the control valves (23) of the cold water inlet hole (4), the cold water outlet hole (5), the hot water inlet hole (6) and the hot water outlet hole (7). The temperature of the water-passing copper pipe (10) controls the internal temperature of the pressure chamber to realize the three-field coupling environment of the temperature field, the seepage field and the stress field. The inner wall of the sleeve (14) s...

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Abstract

The invention relates to a device and a method for clay core wall hydraulic fracturing experiments under simulated coupling conditions. The method is characterized in that two semi-cylindrical molds are specially made and assembled into a sample mold which is easy to assemble and disassemble; the internal temperature of a pressure chamber is controlled through changing the temperature and amount of water in a copper water pipe; internal water pressure is applied to a sample by a water flow passing through a base of the pressure chamber, a permeable plate, coarse sand and finally a blowhole; and hydraulic fracturing features of the clay sample under different conditions are studied through changing the water temperature and loading schemes of the fracturing water pressure, the axial pressure and the confining pressure, etc. The method overcomes the defects of hydraulic fracturing experiments in the prior art on core walls of earth and rock-fill dams, simulates features, force conditions, influencing factors and the like of clay core walls more accurately, and thus can be widely applied in hydraulic engineering and geotechnical engineering.

Description

technical field [0001] The invention relates to a hydraulic splitting test device and a test method of a clay core wall under simulated coupling conditions. Background technique [0002] In the high earth-rock dam projects that have been built and are under construction, clay is generally used as the anti-seepage material, and the mechanical properties of the clay material and the dam shell material are quite different. Therefore, it is necessary to study the hydraulic splitting of the clay core wall through experiments. mechanism. At present, the hydraulic splitting test can be divided into indoor test, field test and model test according to the test method. Among them, the indoor test generally adopts a cylindrical sample (thick-walled or thin-walled cylinder) or a rectangular parallelepiped sample with a central hole (cylindrical hole) or slit ("envelope"-shaped crack). Water was injected in the middle until the sample was split, so as to discuss the occurrence conditio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12G01N1/28
Inventor 甘磊沈振中徐力群王瑞仲良陶小虎
Owner HOHAI UNIV
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