Influence of deformation characteristics of mother rock on mechanical properties of rockfill materials
[1]Hanwha StrongChen ShengshuiWang ZhanjunZheng ChengfengFu Hua.Influence of deformation characteristics of mother rock on mechanical properties of rockfill materials[J].Journal of Zhengzhou University (Engineering Science),2020,41(03):67-71.[doi:10.13705/j.issn.1671-6833.2020.02.017]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
41卷
Number of periods:
2020 03
Page number:
67-71
Column:
Public date:
2020-07-29
- Title:
- Influence of deformation characteristics of mother rock on mechanical properties of rockfill materials
- Keywords:
- rockfill' target='_blank'>">rockfill; host rock; deformation characteristics; mechanical properties; Effect;
- CLC:
- -
- DOI:
- 10.13705/j.issn.1671-6833.2020.02.017
- Abstract:
- Strength and deformation characteristics are two basic indexes that reflect the mechanical properties of mother rock. But the influence of mother rock deformation on the mechanical properties of rockfill is seldom or even neglected in present studies. Based on the large-scale static three axis instrument and the large permeability apparatus, the triaxial tests and permeability tests were carried on two kinds of rockfill materials. Finally, the variations of strength, deformation and permeability characteristics with different lithological rockfill materials were obtained, and the influence mechanisms of deformation characteristics of mother rock on mechanical properties of rockfill materials were preliminary analyzed. The result shows that the deformation characteristics of mother rock also play an important role in the mechanical properties of rockfill materials, namely, the influence of mother rock on the mechanical properties of rockfill materials mainly lies in the strength and deformation characteristics, while the influence on permeability characteristics of rockfill is relatively small. The strength of different rockfill materials is not the same even though the mother rocks under the same uniaxial compressive strength. The influence mechanism of deformation characteristics of mother rock on the mechanical properties of rockfill materials is mainly reflected in two aspects: particle crushing and shear shrinkage. The initial deformation index of rockfill materials has a positive correlation with the deformation index of the mother rock, and in the initial stage of shearing, the more the deformation index of mother rock, the faster and the greater the strength of rockfill materials under the same strain condition, while the cumulative volume deformation and particle breakage are relatively small. With the development of rockfill strain, when a certain stress level is reached, rockfill materials with relatively small deformation index of the mother rock accumulated a relatively large volume deformation due to the shear shrinkage, which lead a slow tendency of rockfill materials strength growth is relatively small. While the crushing amount of rockfill materials with large deformation index increases significantly, and lead a relatively slow growth of rockfill strength. It is possible to obtain a larger peak strength even the deformation index of mother rock is low. Research conclusions indicate that the influence of mother rock on the mechanical properties of rockfill should be studied from two aspects of strength and deformation characteristics
- References:
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Last Update:
2020-07-29