Apparatus and method for dynamic response test of roadbed under water-heat-mechanical coupling

Abstract

The invention discloses a hydro-thermo-mechanical coupled subgrade dynamic response testing device and a method thereof. The device comprises a subgrade body, a water supply system, a loading system,a temperature control system and a data acquisition and processing system. The method comprises the following steps: connection of a data acquisition unit; consolidation and stabilization of the subgrade body; the vacuum insulation process; setting of water supply conditions and operating temperature of a bottom thermostat; the freezing process of the subgrade body; the melting process of the subgrade body; and hydro-thermo-mechanical coupled subgrade dynamic response testing and data acquisition and processing. According to the testing device and the method provided by the invention, by the utilization of a loading frame, a pressure chamber, a constant temperature system, the water supply system and the data processing system and by combining the dynamic loading technology with differentaxial frequencies, the large-scale subgrade loading technology of applying dynamic loads with different frequencies in the axial direction of the subgrade and adding confining pressure transversely isrealized, the experimental results provide accurate physical parameters for the establishment of a realistic hydro-thermo-mechanical coupled subgrade dynamic response model, and the subgrade materialcan be optimized.

Description

technical field [0001] The invention relates to the technical field of indoor dynamic response of road subgrade, in particular to a test device and method for dynamic response of subgrade under water-heat-mechanical coupling. Background technique [0002] Road is the guarantee of national economic development, social progress and convenience for people to pass. As the structural basis of road, the mechanical properties of roadbed body directly affect the deformation and stability of roadbed. Some engineering properties are unstable or easily affected by the environment. Filling in the subgrade will cause subgrade disease. In particular, the deformation and failure of road subgrades in seasonally frozen regions are very complex. The moisture content of the material itself, external traffic loads, ambient temperature, and freeze-thaw cycles will seriously affect the stability of the subgrade. [0003] Dynamic response is the change of stress, strain and acceleration of the st...

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Problems solved by technology

[0006] The embodiment of the present invention provides a water-heat-mechanical coupling subgrade dynamic response test device and method, which solves the problem of the inability to accurately control multiple fields such as temperature, moisture, and dynamic load in the subgrade body dynamic response test system in the prior art The problem

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