Model and method for testing deformation and stress variation law of intensity attenuation roadbed

Abstract

The invention relates to a model for testing deformation and a stress variation law of an intensity attenuation roadbed. The model comprises a model body, wherein the interior of the model body is an empty cavity structure; the empty cavity structure is separated into two parts through a vertical partition wall; one part is a vertical well; a broken stone cushion layer is paved at the bottom of the other part; the broken stone cushion layer is communicated with the bottom of the vertical well; and a silt roadbed, the structure of which is the same as that of a half-amplitude roadbed, is arranged above the broken stone cushion layer. Simultaneously, the invention further discloses a test method of the model. The model and the method disclosed by the invention are capable of analyzing stress and deformation characteristics of the intensity attenuation roadbed and the reinforcement mechanism of a sleeve grouting micro-pile, clearing the effect of a sleeve micro-pile grouting and reinforcing technology for increasing bearing capacity of the roadbed, avoiding differential settlement and increasing stability of a side slope, and providing rational technology reference and theoretical direction for reinforcement and maintenance of the roadbed.

Description

technical field [0001] The invention relates to a civil engineering technology, in particular to a test model and a test method for strength attenuation subgrade deformation and stress change law. Background technique [0002] The subgrade stability mainly includes the uneven settlement of the subgrade and the stability of the subgrade slope. The research on the uneven settlement of the subgrade mainly focuses on the analysis of the reasons for the uneven settlement and its influence on the stress of the pavement structure layer; the analysis of the stability of the subgrade slope mainly focuses on the calculation method of the slope stability and the influence of the stability In addition, there are many studies on the consideration of unsaturated soil matrix suction and slope seepage under rainfall conditions. However, there is a lack of understanding of the stability of the silt subgrade under the condition of subgrade strength attenuation caused by the rise of capillary...

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Problems solved by technology

Because theoretical analysis and numerical calculation are greatly affected by factors such as parameter selection, model selection, and constitutive relations, it is difficult to determine the rationality and representativeness of the analysis results.

The field test work is greatly affected by the construction period, environmental factors, human factors, etc., and it is difficult to conduct multi-working condition test analysis of control variables for the research content

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