水力发电学报
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JOURNAL OF HYDROELECTRIC ENGINEERING ›› 2016, Vol. 35 ›› Issue (10): 103-111.doi: 10.11660/slfdxb.20161011

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Effects of cover-weight lift on concrete stress during consolidation grouting

  

  • Online:2016-10-25 Published:2016-10-25

Abstract: To study cracking in concrete during consolidation grouting, this paper reports three-dimensional finite element simulations of the cover weight lift in the process of consolidation grouting for the cases of applying different grouting pressures or different lifting displacements of the cover weight, along with a case study of the dam section No.11 of the Huangdeng hydropower station. Focusing on concrete surface cracks, we have examined pouring process and stress field in 12 cases of different grouting pressures, lifting displacements and temperature loads, using practical conditions of concrete grouting, temperature control, and data collection practically implemented in the construction of this dam section. The simulation results show that a limited grouting pressure generally causes no significant increase in the tensile stress of concrete, but its tensile safety factor could become quite low if the grouting pressure applied is low enough in the condition of considerable temperature stress. A certain amount of cover weight displacement will cause large tensile stress near concrete surface, and the superposition of temperature loads on the displacement effect often results in higher risks of concrete cracking.

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