Nonsaturated soil hydraulic parameter measuring device
A technology for measuring devices and hydraulic parameters, applied in measuring devices, analysis of suspensions and porous materials, scientific instruments, etc., can solve the problems of measuring soil-water retention curves and unsaturated permeability coefficients in three-dimensional loading states, and achieve simple manufacturing, The effect of high measurement accuracy
Inactive Publication Date: 2010-08-18
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
At present, there is no instrument at home and abroad to measure the soil-water retention curve and the unsaturated permeability coefficient under the three-dimensional loading state.
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[0011] Example: The measurement of unsaturated soil hydraulic parameters, namely soil water conservation curve and unsaturated permeability coefficient is divided into two parts,
[0012] 1) Measuring method of soil and water conservation curve:
[0013] a. Remove the first pneumatic pipeline 11 from the pneumatic pump 21, connect the first hydraulic pipeline 4 to the pneumatic pump 21, close the first pneumatic control valve 18 and the second pneumatic control valve 22, and start the pneumatic pump 21, Open the first water pressure control valve 7 and the second water pressure control valve 19, and pressurize the upper clay plate 14 and the lower clay plate 36 to fill with water;
[0014] b. After the upper clay plate 14 and the lower clay plate 36 are saturated, turn off the air pump 21, connect the first hydraulic pipe 4 to the vacuum pump 8, close the first hydraulic control valve 7 and the second hydraulic control valve 19, The first air pressure pipe 11 is connected with the a...
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The invention relates to an unsaturated soil hydraulic parameter measuring device and a measuring method. The device consists of a pressure chamber 12, a pneumatic pump 21, a vacuum pump 8, a loading frame 10, an appliance base 27, hydraulic pressure pipelines 4 and 20, and pneumatic pipelines 11 and 15. The pneumatic pipelines of the pressure chamber 12 are connected with a pneumatic sensor 16, a pneumatic control valve 18 and the pneumatic pump 21; a water filling pipeline 28 of the appliance base 27 is connected with a control valve 29; the hydraulic pressure pipeline 20 in the center of the sample base is connected with a lower clay plate 14, a hydraulic sensor 9, a water volume measuring pipe 17, a hydraulic pressure control valve 19 and the pneumatic pump 21; a hydraulic pipeline 4 in the center of a top hat is connected with the an upper clay plate 14, the hydraulic sensor 9, a water volume measuring pipe 6, a hydraulic pressure control valve 7 and the vacuum pump 8; a sample 30, a top cap 13, a clay plate 14, a sample 30 and a sample base 25 are arranged between two clay plates 14 and are wrapped by rubber membranes; the sample 30, a pneumatic sensor 23, a pneumatic control valve 22 and the pneumatic pump 21 are connected with the pneumatic pipeline 11 which passes through the rubber membrane from the middle of the sample 30; and the pressure of a weight 26 is added tothe sample by the loading frame 10 and a pressurizing shaft 3. The device can be used for measuring soil and water retention curve and unsaturated permeability coefficient of various soils under the condition of three-directional loading.
Description
Technical field [0001] The invention is a geotechnical testing instrument and belongs to the technical field of civil engineering. Background technique [0002] Unsaturated soils are widely distributed in my country. Natural sedimentary soils widely distributed on the earth's surface and soil problems encountered in engineering construction are almost all unsaturated soil problems. Saturated soils in the true sense are rarely seen in engineering practice. This makes the study of unsaturated soil mechanics very realistic and practical. Hydraulic hysteresis is an important feature of unsaturated soils. Hydraulic hysteresis is usually manifested in the hysteresis of soil-water conservation curves, and the hysteresis of soil-water conservation curves is affected by many factors, such as soil structure, temperature, and stress state. Two important parameters used to describe the hydraulic characteristics of unsaturated soils are the relationship between the unsaturated permeability co...
Claims
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IPC IPC(8): G01N15/08
Inventor 李志清胡瑞林
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI