A kind of retaining wall model test device and method with adjustable matrix suction

Abstract

The invention discloses a matrix suction adjustable and controllable retaining wall model testing device and method. The matrix suction adjustable and controllable retaining wall model testing deviceis characterized by comprising a model casing, a pressure stabilization vacuum pump, a soil moisture sensor, a laser displacement sensor, a PIV testing system, a water supply system, a motor control system and a bearing driving system; by forming threaded holes in a model casing supporting sliding rail, padding behind a retaining wall can have the finite and infinite width; the matrix suction of the padding can be controlled through the vacuum pump, and meanwhile, the soil moisture sensor can be used for monitoring the migration change of the water content of the padding constantly; the laserdisplacement sensor can be used for monitoring displacement change of the movement process of the retaining wall; the motor control system can be used for controlling the retaining wall to move slowlyenough so as to simulate the displacement change process of the retaining wall during practical engineering; and the bearing driving system is used for realizing different displacement modes of the retaining wall to simulate different damage modes of the retaining wall during practical engineering.

Description

Technical field: [0001] The invention relates to a retaining wall test device, in particular to a retaining wall model test device and method capable of regulating matrix suction. Background technique: [0002] The shallow soil in nature is in an unsaturated state. How to consider the influence of matric suction on earth pressure is an urgent problem to be solved. At present, the research on unsaturated earth pressure is based on theoretical solutions and field monitoring, and there are few model tests. However, most of the model tests use filler soil samples with a certain water content first, and then compact the filler layer by layer through static or dynamic compaction methods. However, the unsaturated soil samples obtained by this method have a non-uniform matrix suction distribution. , the reason is that during the compaction process of the soil sample, when the upper soil sample is compacted, the lower soil sample will be dehydrated under the action of the dynamic for...

AI Technical Summary

Problems solved by technology

But for the model test, the suspension column method is difficult to operate in the model test because the range of the matrix suction is only 1-40kPa, and it takes too long, and the axis translation technology is difficult to obtain a high air intake value that meets the model size Clay panels, neither of the above two methods can be applied in model tests

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