Swelling soil side expansive force comprehensive testing device

Abstract

The invention discloses a swelling soil side expansive force comprehensive testing device which comprises a model box for containing swelling soil, a retaining component is arranged in the model box, one side of the retaining component hangs in the air, the other side of the retaining component is in contact with the swelling soil, a plurality of first pressure detection components which are arranged on the positions of different depths respectively and used for measuring side swelling force of the swelling soil are arranged on the wall of the model box, a plurality of second pressure detection components which are arranged on the positions of different depths respectively and used for measuring the side swelling force of the swelling soil are arranged on the retaining components, and a plurality of humidity detection components which are arranged on the positions of the different depths respectively are arranged in the swelling soil. The comprehensive testing device can simulate and measure side swelling force, acting on different retaining structures, of the swelling soil under the environments of the different kinds of humidity and different depths, and the swelling force test bases are provided for design of the retaining structures in a swelling soil area.

Description

technical field [0001] The invention relates to the technical field of civil engineering measurement, in particular to a comprehensive test device for lateral expansion force of expansive soil. Background technique [0002] Expansive soil is a kind of high plasticity clay with large water absorption expansion and water loss shrinkage deformation characteristics. Expansion force is an important index to measure the expansion characteristics of expansive soil. It is defined in the basic terminology standard of geotechnical engineering (GB / T50279-98) as: the soil can fully absorb water under the condition that lateral deformation is not allowed to keep it from vertical The maximum pressure value that needs to be applied to the expansion, including vertical expansion force and horizontal expansion force. At present, there are three main methods for testing the expansion force: the expansion counter-pressure method, the pressurized expansion method and the balanced pressurized m...

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Problems solved by technology

However, the above-mentioned traditional test method is affected by factors such as sample size, water injection method, packing compaction degree, etc., which makes the test results not only have a gap with the actual expansion force level, but also cannot simulate the service environment under different forms of retaining members, so it cannot be directly Services for site in situ monitoring and slope retaining member design

[0003] At present, there is no test device for simulating the lateral expansion force of expansive soil under different forms of retaining members, and no one has ever conducted a test on how to simulate different boundary conditions, the shape and size of the expansive soil slope, the loading method, and the water injection method. had a similar test

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