Multifunctional indoor rain water infiltration simulating experiment device for unsaturated soil

Abstract

The invention discloses a multifunctional indoor rain water infiltration simulating experiment device for unsaturated soil. A plurality of water penetrating holes are formed in the middle of an experiment device platform; the upper surface of the experiment device platform corresponding to the water penetrating holes is connected with a cuboid demountable rigid retaining wall; a closed pressure water container of which the water pressure is adjustable is mounted on the lower surface of the experiment device platform; a plurality of prepared holes are formed in the outer wall of the cuboid demountable rigid retaining wall; the pressure water container and a closed water supply tank are connected with a pressure pump through a pneumatic valve. After the adoption of the technical scheme, the rain water infiltration simulating experiment device has the benefits that rain intensity and rainfall duration are controlled by adjusting the pressure pump and a flow control valve to realize simulation of rainfall working conditions; physical mechanical parameters of water content of unsaturated soil, suction force of base material, and the like during a rain water or underground water level lifting process can be monitored in real time through the sensors inserted in the prepared holes in the rigid retaining wall.

Description

Technical field [0001] The invention relates to a rainwater infiltration simulation test device, in particular to a multifunctional indoor unsaturated soil rainwater infiltration simulation test device. Background technique [0002] Most of the Quaternary soils frequently contacted in engineering are low-water content soils, and their properties do not conform to the principles and concepts of classical saturated soil mechanics. Over the years, scientific research and engineering practitioners in related fields have invested a lot of energy on the properties and determination methods of unsaturated soils from different aspects and have achieved fruitful results. However, when water permeates through unsaturated soil, the process of water infiltration changes is also accompanied by changes in the suction and permeability coefficient of the unsaturated soil, and these changes are difficult to observe directly. However, the indoor simulation test can be used to measure effectively,...

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Problems solved by technology

[0003] At present, most of the unsaturated soil permeability test devices can only simulate the steady-state seepage situation, that is, only consider injecting water directly into the unsaturated soil sample to realize the water seepage from high to low. state to the unsaturated state, which is significantly different from the infiltration of rainwater from an unsaturated state with a high water content to an unsaturated state with a low water content in the soil; in addition, the existing simulation test equipment cannot simulate rainfall of different intensities and the penetration of confined water in unsaturated soil; moreover, most of the current unsaturated soil penetration test devices adopt a single test method, and the data obtained are not representative, which cannot well meet the purpose and requirements of the test.

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