Wetting-drying cycle testing device for soil three-directional soaking under action of load

Abstract

The invention discloses a wetting-drying cycle testing device for soil three-directional soaking under the action of a load. The wetting-drying cycle testing device comprises a humidifying mechanism,a drying mechanism, a weighing mechanism, a pressurizing mechanism, a measuring mechanism and a testing cylinder mechanism; the pressurizing mechanism is placed on a bearing plate of the weighing mechanism; a soaking box of the humidifying mechanism is placed on a base of the pressurizing mechanism; the testing cylinder mechanism is placed in the soaking box; a pressurizing rod in the pressurizingmechanism is positioned on a male plate at the top of the testing cylinder mechanism; the measuring mechanism is fixed on a female plate at the testing cylinder mechanism and a pressurizing lever ofthe pressurizing mechanism respectively by a dial gauge strut and a clamping device; and the drying mechanism is arranged above the pressurizing mechanism. The device implements a combined effect of soil soaking and the load in the soil three-directional soaking and soil wetting-drying cycle processes; an overlying load can be determined according to burden pressures applied to different filled horizons of a roadbed, and a pavement structural layer and a weight of a vehicle load can be considered; in the wetting-drying cycle process, moisture content of soil can be monitored in real time without disassembling the overlying load; and the working condition consistent with the field is implemented.

Description

technical field [0001] The invention relates to a soil dry-wet cycle test device, in particular to a dry-wet cycle test device for three-way soaking of soil under load. Background technique [0002] The red clay loses water and shrinks in the dry season, and absorbs water and expands in the rainy season. This reciprocating action will lead to changes in the structure of the red clay, and the strength of the soil will gradually decrease, eventually causing the destruction of the structure. However, whether it is a decrease in strength or an increase in deformation, the instability and damage of structures is ultimately due to the change in the mechanical indicators of the filler. The long-term dry-wet cycle will reduce the mechanical properties of red clay. At present, the simulated dry-wet cycle effect is to firstly make the sample, leave the stressed state and carry out pre-drying and wetting to a certain number of cycles, and then apply the load. This method obviously doe...

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Problems solved by technology

Finally, the regulations stipulate that the CBR specimens should be soaked in water for 4 days and nights after molding to simulate the overlying pressure in the most unfavorable state during the use of the material. As a result, some subgrade fillers with qualified CBR values ​​are misjudged as unqualified and discarded or mixed with lime cement, which wastes resources and increases costs

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