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Frontiers of Structural and Civil Engineering

Front Struc Civil Eng    2012, Vol. 6 Issue (1) : 25-34     https://doi.org/10.1007/s11709-012-0143-0
RESEARCH ARTICLE
Influence of pressure and density on the rheological properties of rockfills
Erich BAUER1(), Zhongzhi FU2, Sihong LIU3
1. Institute of Applied Mechanics, Graz University of Technology, Graz, Austria; 2. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, 210029, China; 3. Institute of Hydraulic Structures, Hohai University, Nanjing 210098, China
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Abstract

Long-term deformations of rockfill dams can be related to the type of dam, the pre-compaction achieved during the construction of the dam, the history of loading events, the rheological properties of the rockfill material used, the seepage behavior caused by defects of the sealing, the interactions of the dam building with the foundation, and the hydrothermal phenomena of the stressed rockfill material. The present paper investigates the rheological properties of coarse grained rockfill materials using a hypoplastic constitutive model. Particular attention is paid to wetting deformation under different deviatoric loading states and pre-compactions. To quantify the state of weathering a so-called “solid hardness” is used in the sense of a continuum description. It is shown that an appropriate modeling of wetting deformations requires a unified description of the interaction at least between the state of weathering, the stress state, the density and the rate of deformation. The results obtained from the numerical simulations are compared with available experimental data for a rockfill material used in Xiaolangdi earth dam.

Keywords rockfills      solid hardness      wetting deformation      hypoplasticity      creep     
Corresponding Author(s): BAUER Erich,Email:erich.bauer@tugraz.at   
Issue Date: 05 March 2012
 Cite this article:   
Erich BAUER,Zhongzhi FU,Sihong LIU. Influence of pressure and density on the rheological properties of rockfills[J]. Front Struc Civil Eng, 2012, 6(1): 25-34.
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http://journal.hep.com.cn/fsce/EN/10.1007/s11709-012-0143-0
http://journal.hep.com.cn/fsce/EN/Y2012/V6/I1/25
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Fig.1  (a) Micro-structure of a weathered rockfill material; (b) single particle crushing test under dry and a wet condition []
Fig.2  (a) Isotropic compression behavior of grain aggregates under dry and wet condition; (b) wetting settlements of a pre-compressed material under initially dry conditions
Fig.3  Triaxial compression tests under different lateral stresses (Li []): (a) peak friction angles for the dry and the water saturated material; (b) axial creep strain depending on the mobilized friction angle
Fig.4  (a) Isotropic compression law by Bauer [,,] in a semi-logarithmic representation; (b) pressure dependence of the limit void ratios
Fig.5  (a) Degradation of the solid hardness; (b) influence of a change of the solid hardness on the limit void ratios
Fig.6  Triaxial compression tests under a constant lateral stress of -100 kPa: the shapes indicate experimental data by Li [], dashed curves and solid curves are numerical results for the dry state and the water saturated state, respectively
Fig.7  Triaxial compression tests under a constant lateral stress of -1000 kPa: the shapes indicate experimental data by Li [], dashed curves and solid curves are numerical results for the dry state and the water saturated state, respectively
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