Device and method for bituminous concrete hydraulic fracture testing

Abstract

The invention relates to a research device and a technique which can be widely used in the bituminous concrete hydraulic fracture mechanism in engineering including the hydraulic engineering and the geotechnical engineering, in particular to a device and a method for bituminous concrete hydraulic fracture testing. A barrel cover is arranged at the top end of a rigid barrel, a pressure water inlet is arranged outside the lateral wall of the rigid barrel, a downstream leakage water outlet is arranged outside the rigid barrel on the other side of the pressure water inlet, and the pressure water inlet is higher than the downstream leakage water outlet. Samples of the device and the method include a bituminous concrete upstream material source, bituminous concrete and a bituminous concrete downstream material source, and modulus difference of materials is considered. Boundary conditions of the samples are simple, deflection of bituminous concrete can be controlled through telescopic bolts, and real simulation of the site actual working condition is achieved. In addition, the device exerts water pressure at the pressure water inlet to form a steady seepage field, and the bituminous concrete hydraulic fracture mechanism can be analyzed quantitatively.

Description

technical field [0001] The invention relates to a research device and technology which can be widely used in the hydraulic splitting mechanism of asphalt concrete in water conservancy engineering, geotechnical engineering and other projects, in particular to a test device and test method for hydraulic splitting of asphalt concrete. Background technique [0002] Asphalt has a long history as a hydraulic material for anti-seepage engineering. Foreign hydraulic asphalt technology is widely used, including dam anti-seepage panels, dam core walls, reservoir anti-seepage, channel embankment anti-seepage, coastal protection, garbage dump sewage tank lining, etc. However, due to various reasons, asphalt concrete, a hydraulic material with excellent performance, is not commensurate with the current domestic water conservancy and hydropower engineering construction status, and has not been fully utilized in our country. At the 16th International Conference on Large Dams, experts from...

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Problems solved by technology

However, during the operation of the dam, the asphalt concrete core wall will undergo large deformation under the action of water load. The monitoring data of Finstertal and other dams show that this deformation may lead to widening of the core wall, increased porosity and increased water permeability. Then a new seepage field is formed, which provides a precondition for possible hydraulic splitting; moreover, both sides of the asphalt concrete core wall of an earth-rock dam are generally provided with gravel material transition zone 3, but the nonlinear deformation modulus of hard gravel material Much larger than the asphalt concrete core wall, resulting in a strong arch effect between the core wall and the transition material, and may also cause hydraulic splitting of the core wall

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