Volume 9 Issue 3
Jul.  2016
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Article Navigation >  Water Science and Engineering  > 2016  >  9(3): 219-226
Si-hong Liu, Liu-jiang Wang, Zi-jian Wang, Erich Bauer. 2016: Numerical stress-deformation analysis of a cut-off wall in clay-core rockfill dam on thick overburden. Water Science and Engineering, 9(3): 219-226. doi: 10.1016/j.wse.2016.11.002
Citation: Si-hong Liu, Liu-jiang Wang, Zi-jian Wang, Erich Bauer. 2016: Numerical stress-deformation analysis of a cut-off wall in clay-core rockfill dam on thick overburden. Water Science and Engineering, 9(3): 219-226. doi: 10.1016/j.wse.2016.11.002
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Numerical stress-deformation analysis of a cut-off wall in clay-core rockfill dam on thick overburden

doi: 10.1016/j.wse.2016.11.002

  • a College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China

  • b Zhejiang Design Institute of Conservancy and Hydroelectric Power, Hangzhou 310002, China

  • c Institute of Applied Mechanics, Graz University of Technology, Graz 8010, Austria

Funds:  This work was supported by the National Natural Science Foundation of China (Grant No. 51379066), the Fundamental Research Funds for the Central Universities (Grant No. 2016B03514), the National Key Technology Support Program (Grant No. 2015BAB07B05), and the Key Laboratory of Earth-Rock Dam Failure Mechanism and Safety Control Techniques (Grant No. YK913007).
  • Received Date: 2015-09-12
  • Rev Recd Date: 2016-01-16
    Abstract
  • The cut-off wall in a clay-core rockfill dam built on a thick overburden layer is easily subjected to a great compressive pressure under the action of the loads such as the dead weight of both the dam and the overburden layer, the frictional force induced by the differential settlement between the cut-off wall and its surrounding soils as well as the water pressure. Thus, how to reduce the stress of the cut-off wall has become one of the main problems that need to be considered in the engineering design. In this paper, numerical analysis of a core rock-fill dam built on a thick overburden layer was conducted and some factors influencing the stress-strain behaviors of the cut-off wall were investigated. The factors include the improvement of the overburden layer, the modeling approach for interfacial contact between the cut-off wall and its surrounding soils, the modulus of the cut-off wall concrete, and the connected pattern between the cut-off wall and the clay core. The result shows that improving the overburden layer, selecting plastic concrete with a low modulus and a high strength, and optimizing the connection between the cut-off wall and the clay core of the dam are effective measures to reduce the deformations and compressive stresses of the cut-off wall. Besides, both the Goodman element and mud-layer element are suitable for simulating the interfacial contact between the cut-off wall and its surrounding soils.

     

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