Test device for measuring internal tensile stress and cracks of unsaturated soil in real time within full suction range
A real-time measurement and test device technology, applied in the direction of measurement devices, using stable tension/pressure to test the strength of materials, instruments, etc., can solve the problem of limited suction value, and achieve simple structure, convenient operation, and reduced occupation. land area effect
Active Publication Date: 2020-04-21
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER +1
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Problems solved by technology
Since the suction value measured by the tensiometer is limited, it is not suitable for soils with high self-suction. Therefore, the research on the change of tensile stress and cracks in the full range of suction is in urgent need of further exploration.
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[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the present invention. Apparently, the described embodiment is only a part of the implementation of the present invention, rather than the entire implementation. Based on the embodiment of the present invention, all other embodiments obtained by those of ordinary skill in the art without doing creative work are all Belong to the protection scope of the present invention.
[0027] Such as Figure 1-5 As shown, the test device for real-time measurement of unsaturated soil internal tensile stress and cracks within the full suction range includes a soil sample tension unit, a stress-strain test unit 11 and an image acquisition unit 7, and the soil sample tension unit is a ring soil sample A tension unit, the annular soil sample tension unit is detachably provided with a low suction measuring device 6 and a hig...
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The invention discloses a test device for measuring internal tensile stress and cracks of unsaturated soil in real time within a full suction range. The test device comprises a soil sample tension unit, a stress-strain test unit and an image acquisition unit, wherein the soil sample tension unit is an annular soil sample tension unit; a low-suction measuring device and a high-suction measuring device are detachably arranged on the annular soil sample tension unit; a camera shooting device is arranged right above the annular soil sample tension unit in a suspended manner; the annular soil sample tension unit is connected with the image acquisition unit by means of the camera shooting device; and the annular soil sample tension unit is electrically connected with the stress-strain test unit.According to the test device, two suction force control methods of using a tensiometer and a saturated salt solution are combined for use, the change range of suction force research can be further expanded, and the change of tensile stress in a soil body and the development condition of cracks within the full suction range are dynamically observed.
Description
technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a test device for real-time measurement of unsaturated soil internal tensile stress and cracks within the full suction range. Background technique [0002] In unsaturated soils, tensile strength and tensile stress are the two main factors controlling the development of soil cracks. The increase of suction makes the soil gradually shrink and dry, and the internal tensile stress gradually increases. When the tensile stress exceeds the tensile strength, cracks appear in the soil. It is very important to understand the mechanism of crack initiation caused by the increase of suction in unsaturated soil. To measure and predict tensile strength, many experimental methods and theoretical models have been proposed. However, the ring test device for real-time measurement of the internal tensile stress and cracks of unsaturated soil in the full suction range is...
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IPC IPC(8): G01N3/08G01N3/10G01N3/06
CPCG01N3/08G01N3/10G01N3/06G01N3/066G01N3/068G01N2203/0017G01N2203/0048G01N2203/0067G01N2203/0075G01N2203/0676G01N2203/0682
Inventor 张俊然霍继炜姜彤翟国政高宇甲李俊杰赵金玓朱云江陈金权胡魁韩明涛余斌焦继伟孟旭
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER