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Volume 46 Issue 7
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WANG Fang, LI Guoying, MI Zhankuan, FENG Yelin, HUANG Qingfu. Evaluation method for safety of concrete slab stress based on multi-axial strength criterion[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(7): 1378-1386. DOI: 10.11779/CJGE20230515
Citation: WANG Fang, LI Guoying, MI Zhankuan, FENG Yelin, HUANG Qingfu. Evaluation method for safety of concrete slab stress based on multi-axial strength criterion[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(7): 1378-1386. DOI: 10.11779/CJGE20230515
shu

Evaluation method for safety of concrete slab stress based on multi-axial strength criterion

  • 1.

    Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China

  • 2.

    Power China Kunming Engineering Corporation Limited, Kunming 650051, China

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  • Received Date: June 06, 2023
  • Available Online: November 21, 2023
    Graphical Abstract
    • Abstract
  • The concrete-faced rockfill dams (CFRDs) rely on the key impermeable structures, such as concrete slabs, for their safe operation. Ensuring the safety of the concrete slabs is of the utmost importance. The current evaluation method, which utilizes uniaxial strength, overlooks the influences of slab stress on their strength and may lead to unreasonable judgments regarding the damage zone. To address this issue, a method is proposed for evaluating the stress in the concrete slabs based on the multi-axial strength criterion. The safety of the slabs is assessed by determining the strength adjustment coefficient of concrete and the stress level index of multi-axial strength. A refined stress distribution analysis of the slabs is conducted using the cross-scale fine simulation method based on the multi-point constraint. The improved viscoelastic method is employed to comprehensively simulate the impact of dynamic and permanent deformations on the slab stress. This approach accurately depicts the progression of slab damage during an earthquake. To illustrate the effectiveness of the proposed multi-axial strength method, a 240 m-high concrete-faced rockfill dam located in a narrow valley within a seismic zone is taken as an example for comparison with the current uniaxial strength method. The results demonstrate that during the operational period, the material strength at both sides of the dam abutment is reduced, while it is enhanced on the riverbed, particularly at the bottom. Both methods yield similar conclusions regarding the tensile damage zones, but there are significant disparities in the compressive damage zones. During an earthquake, the multi-axial strength method indicates slightly smaller tensile damage zones, whereas the location and extent of the compressive damage zones differ significantly between the two methods. Considering the limitations of the uniaxial strength method in considering the influences of slab stress on their strength, it is suggested to adopt the multi-axial strength criterion as a guide for designing and constructing concrete slabs in extra-high CFRDs.
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