Abstract
With the rapid development of asphalt concrete core rockfill dams (ACCRDs), the construction of ultra-high asphalt concrete core rockfill dams (UACCRDs) has been improved significantly. However, the security problems of asphalt concrete core (ACC) become very prominent with the increase of dam height. The shear failure control standard and tensile failure control standard of ACC are suggested. The mechanisms of ACC that generate high shear stress and high tensile stress are investigated. Based on the definition of stress level and the transmission mechanism of arch structures, the improvement methods that reduce the high shear stress and high tensile stress of ultra-high asphalt concrete core (UACC) are proposed and investigated. The results show that the stress level of ACC can be reduced significantly by the increase of the strength parameters of ACC (failure ratio, cohesion, and internal friction angle). The following value ranges of the failure ratio, cohesion, and internal friction angle of ACC for the suitable construction of UACCRDs are recommended: Rf ≥ 0.75, C ≥ 0.30 MPa, and φ ≥ 28.5° (h = 150 m), with the growth gradient adjusted by 5%, 15%, and 5%/25 m. The tensile stress and tensile stress area can be reduced obviously by the new type of dams (curved asphalt concrete core rockfill dams (CACCRDs)). The value ranges of the curvature of CACC (k ≥ 1.0 × 10−3) for the suitable construction of UACCRDs are recommended.
Highlights
Comparing with clay core rockfill dams (CCRDs), the development of asphalt concrete core rockfill dams (ACCRDs) is relatively late
The International Commission on Large Dams (ICOLD) [9], Höeg [10], and Wang [11] summarized the knowledge of ACCRDs in terms of design, construction, and performance
The purpose of this paper is to provide a reference for the construction of ultra-high asphalt concrete core rockfill dams (UACCRDs) in the future
Summary
Comparing with clay core rockfill dams (CCRDs), the development of asphalt concrete core rockfill dams (ACCRDs) is relatively late. The latter has become a very competitive type of dam because of its good seepage resistance, earthquake resistance, low cost, and ability to adapt to deformation [1,2,3,4,5,6,7,8]. The International Commission on Large Dams (ICOLD) [9], Höeg [10], and Wang [11] summarized the knowledge of ACCRDs in terms of design, construction, and performance. With the depth of research and the accumulation of damming experience [12,13,14,15,16,17,18,19,20,21,22,23], the Quxue Dam [24] was built in China in 2017
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