Comprehensive test device for vertical expansive force and swelling reduction effect of expansive soil

Abstract

The invention discloses a comprehensive testing device for an expansion reduction effect of a vertical expansive force of expansive soil. The comprehensive testing device comprises a model box, wherein the model box is internally and sequentially filled with an expansive soil layer, an expansion reduction layer and a base bed structure layer from bottom to top; a force application assembly for downwards applying pressure to the base bed structure layer and a displacement detection assembly for measuring the deformation amount of the base bed structure layer are arranged above the base bed structure layer; a pressure detection part is arranged between the expansion reduction layer and the base bed structure layer; the expansive soil layer is internally provided with a plurality of humidity detection parts which are arranged at different depth positions. The comprehensive testing device can be used for testing the vertical expansive forces of the expansive soil with different grades under the conditions of the expansion reduction layers with different types, different thicknesses and different grades so as to obtain a change principle of the vertical expansive force along with the humidity changing amount in the expansive soil layer along the depth direction of the expansive soil layer; evidences are provided for reasonably selecting the types, the thicknesses and the grades of fillers of the expansion reduction layer; the comprehensive testing device has the very important meaning on influences of the expansion reduction layer on the expansive force of the expansive soil.

Description

technical field [0001] The invention relates to the technical field of civil engineering measurement, in particular to a comprehensive test device for the expansion reduction effect of the vertical 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. The foundation built on the expansive soil foundation and the retaining structure of the expansive soil slope must bear the expansion force generated by the expansion. This expansion force is sometimes large enough to affect the stability of the foundation and retaining structures, or even destroy them. For this reason, in addition to improving the strength of the structure itself and increasing the allowable deformation of the structure, a sandstone layer can also be set between the structure and the expansive soil as a swelling-reducing layer. It mainly has two functions: ①R...

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Problems solved by technology

[0003] At present, there is no test device to study the actual swelling reduction effect of the swelling reduction layer under the test conditions, and it is not convenient to reasonably select the filler, thickness and gradation of the swelling reduction layer.

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