Measurement method for large-displacement shear-flow of rock under high temperature and high pressure
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A technology of high temperature and high pressure, measurement method, applied in the field of rock mechanics, can solve the problems of measurement failure, sample breakage, inability to accurately determine the geometric size of the seepage section, etc., and achieve the effect of reasonable device structure and simple operation method.
Active Publication Date: 2015-05-06
TAIYUAN UNIV OF TECH
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The measurement method of oblique shear seepage exists: because the shear surface has a certain angle with the sample axis, the shear area changes during the shear slip process, and the local stress state of the sample changes; the path of the seepage fluid is irregular, resulting in Unable to accurately determine the geometric size of the seepage cross section; the shortcoming of small shear displacement, especially only about 2mm at high temperature
The direct shear seepage measurement method, although the shear displacement is large, but because the samples in the
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Embodiment 1
[0039] Such as figure 1 As shown, a method for measuring large-displacement shear seepage of rock under high temperature and high pressure (gas pressure transmission medium), the measurement steps are:
[0040] (1) Change the inner diameter d t , wall thickness e, length L t The high-temperature-resistant rubber sleeve 2 is fitted into the opening diameter d at both ends1 = d t +2e, length L f = Lt, middle cavity diameter d 2 Greater than the opening diameter at both ends d 1 Inside the autoclave 1 (see image 3 , 4 , 5, 6, 7);
[0041] (2) the diameter D 0 , length L 0 A short specimen of semi-cylindrical rock 3.1 and diameter D 0 , length L>L 0 The semi-cylindrical rock long sample 3.2 is combined and put into the high temperature resistant rubber sleeve 2 (see Figure 8 , 9 , 10, 11);
[0042] (3) Connect the flange of the autoclave 1 and the flange of the axial pressurization cylinder 6 with fastening bolts 4. The flanged sealing surface 2.1 at one end of th...
Embodiment 2
[0060] Such as figure 2 As shown, a method for measuring large-displacement shear seepage of rock under high temperature and high pressure (liquid pressure transmission medium), the measurement steps are:
[0061] (1) Change the inner diameter d t , wall thickness e, length L t The high-temperature-resistant rubber sleeve 2 is fitted into the opening diameter d at both ends 1 = d t +2e, length L f = Lt, middle cavity diameter d 2 Greater than the opening diameter at both ends d 1 Inside the autoclave 1 (see image 3 , 4 , 5, 6, 7);
[0062] (2) the diameter D 0 , length L 0 A short specimen of semi-cylindrical rock 3.1 and diameter D 0 , length L>L 0 The semi-cylindrical rock long sample 3.2 is combined and put into the high temperature resistant rubber sleeve 2 (see Figure 8 , 9 , 10, 11);
[0063] (3) Connect the flange of the autoclave 1 and the flange of the axial pressurization cylinder 5 with fastening bolts 4. The flanged sealing surfaces 2.1 at both e...
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Abstract
The invention discloses a measurement method for the large-displacement shear-flow of rock under a high temperature and a high pressure, relates to a rock mechanics test method, and solves the technical problem that measurement for the large-displacement shear-flow of rock under high temperature and high pressure cannot be carried out by the existing method. According to the measurement method disclosed by the invention, high-temperature-resistant rubber is arranged in a pressure kettle with two open ends in a sleeving manner, two semi-cylindrical rock test samples with the same section shape and dimensions and different lengths are combined and then placed into a high-temperature-resistant rubber sleeve, a pressure transfer medium fills up the space between the outer wall of the rubber sleeve and the inner wall of the pressure kettle, heating and confining pressure applying devices are configured for the pressure kettle, a pore pressure applying device is configured for an axial pressing cylinder, a pore fluid flows out through a crack surface in the middle of the combined rock test sample, and flow characteristics in a rock shear process under the high temperature and the high pressure are obtained by measuring the flow speed of the pore fluid flowing out from an axial fixed cylinder. The measurement method disclosed by the invention has the advantages of being reasonable in structure, simple in operation method, and easy to realize the measurement for the large-displacement shear-flow of the rock under high temperature and high pressure.
Description
technical field [0001] The invention belongs to the field of rock mechanics, in particular to a method for measuring large displacement shear seepage of rock under high temperature and high pressure. Background technique [0002] The shear seepage of rock is the basis for the study of major geological disasters, such as the mechanism of earthquakes and landslides, the activation mechanism of faults induced by hydraulic fracturing in the development of energy resources, etc. At present, the measurement methods of rock shear seepage include: the measurement method of direct shear flow under normal temperature and low pressure (confining pressure less than 20MPa); the measurement method of oblique shear flow under normal temperature and high pressure; the measurement method of oblique shear flow under high temperature and high pressure. The measurement method of oblique shear seepage exists: because the shear surface has a certain angle with the sample axis, the shear area chan...
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