Asphalt pavement pore water pressure simulation test device and method

Abstract

The invention discloses a simulation testing device and method for bituminous pavement pore water pressure. The device comprises a bituminous concrete sample, an open container and a pressure container, wherein the bituminous concrete sample and the open container are located in the pressure container, the portion between the bottom of the bituminous concrete sample and the opening annular portion of the open container is filled with a bonding agent, the side wall of the bituminous concrete sample is coated with the bonding agent, a first pressure sensor used for measuring outer water pressure of the bituminous concrete sample and a second pressure sensor used for measuring bottom water pressure of the bituminous concrete sample are arranged on the side wall of the open container. The method includes the steps that after the prepared bituminous concrete sample and the open container are placed in the pressure container, the pressure sensors, a piston and a seal pressure container are installed, a control flow path is selected to start testing, and data of the pressure sensors is collected. Directional movement of pore water is achieved through the device, and the response regularity of dynamically-changed bituminous concrete pore water pressure under the external water pressure action can be tested.

Description

technical field [0001] The invention relates to the analysis of dynamic water pressure of asphalt pavement, in particular to a simulating test device and method for pore water pressure of asphalt pavement. Background technique [0002] The dynamic water pressure on asphalt pavement has a great destructive effect on the pavement. However, there are few studies on the actual change law of the pore water pressure at different moments of the wheel load process under different wheel load combinations, different pavement pore types, and different pavement depths. , that is, the actual conditions that cause hydrodynamic pressure are not fully considered, so the research conclusions cannot be mutually verified. Air-free water is incompressible, and its elastic modulus is very large. After unloading, the stress in the water should dissipate instantly. However, existing theoretical studies regard the pores of asphalt pavement as water-saturated state, but it is concluded that the pore...

AI Technical Summary

Problems solved by technology

Due to the complexity and concealment of the internal pore structure of asphalt concrete, it is difficult to ensure that the connected pores are drilled and the pore water flow is not changed when drilling holes in the specimen for the installation of sensors.

It is necessary to drill holes in the asphalt concrete specimens to install sensors and ensure that the drilled holes communicate with the connected pores, install the sensors firmly, and lead the sensor data lines through the pressure vessel to the data acquisition instrument. This is practically necessary. very difficult

On the other hand, due to the fast speed of the vehicle, the time to pass the road is very short, and the pore water pressure fluctuation of the road surface lasts very short. If a high-frequency pressure monitoring and acquisition system is not used, it is difficult to accurately capture the fluctuation information. High-frequency pressure acquisition systems are also required when short-term loads are applied in model tests

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