Analysis of the Influence of Different Bending Section Length on the Mechanical Characteristics of Ultra-high Asphalt Concrete Core Wall
The traditional asphalt concrete core wall dam is prone to hydraulic fracturing under the horizontal water pressure.By arching the core wall at both ends of the dam abutment to the upstream,the tensile stress in the core wall and the area of the tensile stress area can be reduced,and the hydraulic fracturing damage of the core wall can be avoided.The three-dimensional finite element numerical simulation method is used to study the influence of different bending lengths at both ends of the core wall on the stress and deformation of the asphalt concrete core wall dam.In the calculation,Duncan-Chang E-B model is used as the constitutive model of dam body and core wall material,and the process of dam filling and reservoir impoundment is simulated.The length of the bending section at both ends of the core wall is taken as 10%,15%and 20%of the length of the core wall along the dam axis,so as to obtain the influence of different bending section length on the displacement and stress distribution of asphalt concrete core wall and dam body.The calculation results show that the deformation and stress of the dam body are within the allowable range.When the length of the bending section at both ends of the core wall is taken as 20%of the length of the core wall along the dam axis,the stress characteristics of the asphalt concrete core wall can be best improved.The dam filler and core wall materials meet the strength requirements.The results can provide reference for structural design and construction.
Length of different bending sections at both endsthe tensile stress valuearea of tensile stress area
万方数据
维普
