A Soil Instantaneous Permeability Tester and Soil Permeability Calculation Method
A technology of permeability characteristics and tester, applied in permeability/surface area analysis, instruments, measuring devices, etc., can solve the problems of incompletely mature permeability characteristics of unsaturated soils, and achieve shortened test time, accurate permeability coefficient, and accurate evaluation. Effect
Active Publication Date: 2020-02-21
SOUTHWEST UNIV
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Problems solved by technology
However, the research on the permeability characteristics of unsaturated soil is not yet fully mature, and there are still a lot of problems to be solved
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[0055] Attached below Figure 1-3 Examples and examples further illustrate the present invention: a soil instantaneous permeability tester, including a sample tube 1, the bottom of the sample tube 1 is sealed by a bottom plate 13, the bottom plate 13 is opened with at least one drainage port A3 and drainage Port B4, a layer of clay plate 5 is provided above the drainage port A3, a permeable hole 32 is provided on the periphery of the clay plate 5, and a drainage port B4 is provided below the permeable hole 32; the outer circumference of the sample tube 1 is from top to bottom At least five groups of acquisition sensors are evenly arranged, each group of acquisition sensors includes a water content sensor, a suction sensor and a water pressure sensor, and the water content sensor, suction sensor and water pressure sensor are evenly arranged along the circumference; the top of the sample tube 1 The top cover 7 is connected by a flange, and the top cover 7 is provided with an oppo...
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The invention relates to the field of soil permeability test, and especially relates to a soil instantaneous permeability characteristic tester and a permeability characteristic calculation method. The soil instantaneous permeability characteristic tester comprises a sample tube, a ceramic plate, a sensor and other parts. The method comprises the steps of calculating a micro suction distribution function psi (z,t). The tester not only can test a conventional permeability test in the previous permeability test, but can also simulate the permeation working conditions of soil in different saturation states, and obtain corresponding parameters in real time to obtain a permeability curve; a previous soil permeability test and a soil-water characteristic curve test are combined into one, so thatthe test duration is greatly shortened; and since a new model parameter is introduced in a soil permeability characteristic test calculation method, a calculated permeability coefficient is more accurate and is closer to the real state. The soil permeability characteristic calculation method provided by the invention is applied to the feasibility evaluation of civil engineering constructions involving strength characteristics, deformation characteristics and permeability characteristics of the foundation soil under different saturation states, the evaluation is more accurate, and more preciseguidance is provided for the later design.
Description
Technical field [0001] The invention relates to the field of soil permeability tests, in particular to a soil instantaneous permeability characteristic tester and a permeability characteristic calculation method. Background technique [0002] As one of the three important characteristic indexes of soil, permeability coefficient is an important parameter for analyzing water migration. The permeability coefficient of the soil in the saturated state can be easily obtained, but the actual geotechnical engineering and geotechnical environmental engineering mainly involve the infiltration of unsaturated soil. For example, the slope stability under rainfall infiltration, domestic garbage and Disposal of underground waste materials, oil extraction, etc. Unsaturated soil is full of complexity and variability due to the difference in water content and matrix suction and the complex interaction between them, which makes it difficult to study the permeability of unsaturated soil. [0003] Hi...
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IPC IPC(8): G01N15/08
CPCG01N15/08G01N15/082
Inventor 汪时机李贤毛新曹挺梁广川李达江胜华胡嫚
Owner SOUTHWEST UNIV