Abstract
The paper aimed to investigate internal mechanics between disintegration of the rockfill material and stability of the dam, and further provide scientific evidence for the design of rockfills, through the conducted disintegration of water pressure and triaxial test to analyze fractal characteristics, strength and deformation of the rockfill in whole disintegration procedure. As the results that the water pressure was low 0.2 MPa, the increasing water pressure would delay the disintegration rate of rockfill; while the water pressure was above 0.2 MPa, it would promote the disintegration rate of the rockfill. In addition, in the disintegration process, the cohesion force of rockfill rapidly slowed down at the beginning and then gradually increased. The internal friction angle increased gradually during the whole disintegration process. Furthermore, when the water pressure increased from 0 MPa to 0.6 MPa, the partial stress firstly decreased to a minimum level when the water pressure was 0.2 MPa, and then increased gradually with water pressure.
Highlights
Materials with high strength, low compressibility and long-term stability of engineering properties are usually the first choice for damming rockfill materials
In order to study the effect of rockfill disintegration characteristics on the strength and deformation of rockfill under different water pressure, we adopted a microcomputer-controlled electro-hydraulic servo static triaxial tester, and test material was scaled according to the specification and other mass substitution methods
Particle characteristics of soft rockfill disintegration under different water pressure were analyzed in the present study
Summary
Low compressibility and long-term stability of engineering properties are usually the first choice for damming rockfill materials. Due to objective factors, many soft rock materials are widely used in the filling of rockfill dams. During the long-term operation of the dam rock, the water infiltration will inevitably result in water pressure around the rockfill material. Under the action of water pressure, the rockfill material will disintegrate, which will inevitably change the particle gradation of the rockfill material, and in further change the seepage field and stress field of the rockfill. It is necessary to study the fractal, strength and deformation characteristics of rockfill disintegration process under different real water pressure conditions
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