Vertical shaft combined vacuum method precipitation test device and method for saturated soil with an air pocket

Abstract

The invention relates to a vertical shaft combined vacuum method precipitation test device for saturated soil with an air pocket. The device comprises a test box, and a water injection system, an airinjection system, a water pumping system, a vacuumizing system and a monitoring system all connected with the test box, the water injection system supplies water to a test soil body from bottom to topto obtain a saturated test soil body; the gas injection system simulates generation of gas in a saturation test soil body; the water pumping system pumps water from the test soil body and is used fordewatering the test soil body; the vacuumizing system is used for changing the pore pressure boundary of the soil body, so that vacuum degree is generated in the test box. The invention further provides a test method of the vertical shaft combined vacuum method precipitation test device for the saturated soil body with the air pocket. In the water injection, gas injection, vacuumizing and vertical shaft precipitation test process, by monitoring the soil pressure, sedimentation, water level, pore pressure and water content of the test soil body and the water pumping amount, gas pumping amountand vacuum degree, precipitation effects under different closed air pocket belt occurrence conditions and different precipitation schemes can be simulated and analyzed.

Description

technical field [0001] The invention relates to the field of vertical well combined vacuum method precipitation tests, in particular to a vertical well combined vacuum method precipitation test device and method for air-containing saturated soil. Background technique [0002] In the field of geotechnical engineering, there are saturated soils with enclosed air pockets, such as high organic matter saturated soft soil foundations and high water table landfills. For saturated soft soil with high organic matter content, biogas formed by the degradation of organic matter will accumulate in the interior, and the existence of these enclosed gases will have a major impact on the safety of tunnel excavation and deep foundation construction. The problem of high leachate water level is common in landfills. Below the water level, landfill gas formed by the degradation of degradable waste will also accumulate inside the landfill. The problems of unstable and slippery piles, groundwater ...

AI Technical Summary

Problems solved by technology

At present, the indoor large-scale precipitation model test systems are all aimed at saturated soils without closed air pockets, and there is a lack of indoor large-scale precipitation model test systems for saturated soils with closed air pockets

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