Sand particle gradient fatigue liquefaction experiment device and method

Abstract

The invention discloses a sand particle gradient fatigue liquefaction experiment device and method. The device comprises a sand sample loading container, a water loading container, an overflow sand collecting container, an overflow water collecting measuring cup, a base, a vibration table, a filter net, a regulating valve, a flow rate meter, a flow meter, a pore water pressure sensor and a transparent capillary. The method comprises the following steps: sampling and measuring physical property indexes, sieving a sample according to the particle size range, loading the sample into the sand sample loading container, treating the sample according to relative density, measuring the initial void ratio, inserting the transparent capillary into the sample, opening the valve to inject water, observing and collecting an infiltration line and a saturation line until the sample is saturated, closing the valve, setting vibration parameters, starting the vibration table, turning off the vibration table at the end of liquefaction starting from the continuous overflowing of a water-sand mixture till that the overflowing stops and the transparent capillary stops tilting, recording the liquefactiontime, settling volume and pore water pressure, drying and weighing overflowed sand, recording the overflowing water volume, adjusting the relative density and vibration parameters, and carrying out comparative experiments.

Description

technical field [0001] The invention belongs to the technical field of sandy soil liquefaction experiments, in particular to a sandy soil particle gradient fatigue liquefaction experimental device and method. Background technique [0002] At present, in the process of open-pit mining, a large number of complex slopes with thick and saturated sand layers on the bedrock are often faced. In the sand layers of the composite slope, fine sand particles will form hydraulic gradients under the action of high water head differences. At the same time, it will also bear the vibration of vehicle dynamic load, mine shock, blasting, etc., and under the action of vibration, the fine and non-cohesive sand particles near the vibration source will undergo gradient fatigue liquefaction due to the difference in particle size and specific gravity, while Gradient fatigue liquefaction of sand particles is a gradual accumulation process with obvious time effect. [0003] When the gradient fatigue ...

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Problems solved by technology

[0003] When the gradient fatigue liquefaction of sand and soil particles occurs on the composite slope of the open-pit mining site, the fine and non-cohesive sand particles will migrate with the seepage of groundwater, which will lead to latent erosion of the composite slope, cracking of the top of the slope, and landslides. Instability, thus endangering mining safety

[0004] At present, the experimental devices used to study the gradient fatigue liquefaction of sand particles are very scarce, and some related experimental devices are mainly used to simulate the phenomenon of piping, sand collapse and water and sand migration in the process of underground mining, but none of them can simulate Gradient Fatigue Liquefaction of Sand Particles Under Vibration

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