Method for measuring permeability coefficient of asphalt concrete binding layer

Abstract

The invention provides a method for measuring the permeability coefficient of an asphalt concrete binding layer. The method includes the steps that a first layer of asphalt concrete and a second layerof the asphalt concrete are compacted and formed in a steel mold successively, a columnar asphalt concrete binding layer sample with a central hole is prepared, the horizontal seepage of the sample is measured by a triaxial seepage testing machine, and permeability parameters are obtained. According to the method for measuring the permeability coefficient of the asphalt concrete binding layer, the asphalt concrete sample with a certain diameter of an inner hole is prepared, the convenience is brought for measurement of the permeability coefficient of the asphalt concrete under three-dimensional stress, and the key technical problems of measurement of the permeability coefficients of hydraulic engineering asphalt concrete core-wall binding layers are solved.

Description

technical field [0001] The invention relates to a rock-soil test method, in particular to a method for measuring the permeability coefficient of an asphalt-concrete bonded layer. Background technique [0002] Roller-compacted asphalt concrete core walls are paved and rolled in layers along the dam axis, forming more discontinuous bonding layers in the core walls. Due to many problems, the interlayer bonding of asphalt concrete is not good, so the interlayer permeability coefficient does not meet the specification requirements. Under the operating conditions of the dam body, the asphalt-concrete bonding layer will generate seepage channels in the dam body, which threatens the anti-seepage safety and stability of the asphalt-concrete core wall dam. [0003] During the construction of RCC core wall dams, the asphalt-concrete joint surface is always the focus of everyone's concern, and it is also recognized as the weak link of the anti-seepage body. Combined with the quality, ...

AI Technical Summary

Problems solved by technology

However, hydraulic asphalt concrete has high compactness and low density, and it takes a long time to measure the permeability coefficient; during the operation of the dam body, the core wall has to bear a high water head, and the above two methods cannot simulate the high water head. Permeability determination

The bonding layer of asphalt concrete is the weak layer of dam safety, and the permeability coefficient of the bonding layer of asphalt concrete cannot be measured

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