Experimental device and method for frozen soil foundation upper pipe culvert model under traffic load effect

Abstract

The invention discloses an experimental device and method for a frozen soil foundation upper pipe culvert model under a traffic load effect. The experimental device comprises an outer box body and an inner box body, wherein a waterproof layer is paved at the bottom of the inner box body; a simulated soil body is paved on the waterproof layer; a test pipe culvert is arranged in the simulated soil body; the experimental device further comprises a servo hydraulic loading system, a water inlet control system, a water discharging and collecting system, a traffic load simulation system, pressure sensing systems and a PIV (particle image velocimetry) testing system, wherein the servo hydraulic loading system is fixed at the upper part of the outer box body; the water inlet control system and the water discharging and collecting system are arranged above the side of the outer box body and below the opposite side of the outer box body respectively; the traffic load simulation system is located on a cover plate of the inner box body and below the cover plate of the outer box body; the pressure sensing systems are distributed at the periphery of the test pipe culvert in the inner box body; and the PIV testing system is located at the outer part of the outer box body and is used for researching stress characteristics of the frozen soil foundation upper pipe culvert and displacement of surrounding filling soil under a traffic load. According to the experimental device and method, influences, caused by the traffic load and freezing and thawing, on the pipe culvert are considered and the stress of the pipe culvert and the displacement of the surrounding filling soil are analyzed; the influence condition on the pipe culvert, caused by the fact that vehicles pass through an embankment in a frozen soil region, can be simulated relatively really.

Description

technical field [0001] The invention relates to the technical field of geotechnical test equipment, in particular to a model experimental device for pipe and culvert on frozen soil foundation under the action of traffic load, and also relates to an experimental method for the model experimental device for pipe and culvert on frozen soil foundation under the action of traffic load. Background technique [0002] The permafrost area in my country is vast, and about 53.5% of the land area belongs to the seasonal permafrost area. The freezing and thawing of foundation soil in permafrost areas is a key problem affecting the safety of subgrades. The frost heave and thawing settlement of foundation soil have a significant impact on the force of culverts. The stress gradient between the bodies causes the vertical displacement of the culvert and the additional stress of the body. At the same time, with the rapid development of the economy, the volume of logistics transportation is in...

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Problems solved by technology

For this part of the research, there is a lack of relevant test equipment at home and abroad, and it is impossible to effectively study this part of the content.

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