Stability and fracture analysis of arch dam based on deformation reinforcement theory
Fracture is a common and significant failure mode of high arch dam.Current theories are still limited in fracture analysis of 3-D structure.In this paper,deformation reinforcement theory (DRT) is deduced and elaborated with a definition of stability that an elasto-plastic structure is stable if equilibrium condition,kinematical admissibility and constitutive equations can simultaneously be satisfied under given external loads.Furthermore,a global stability analysis method of elasto-plastic structure based on DRT is presented.Unbalanced forces can be used to evaluate the stability of structure and indicate fracture initiation and propagation.FEM expression of DRT is deduced and implemented in a three dimensional nonlinear FEM program,and successfully applied in dam heel cracking and multi-crack analysis of arch dam.As statically indeterminate structure,high arch dam is capable of stress redistribution to some extent while cracking occur.This process was expressed in FEM program by iteration and convergence of unbalanced forces.Both elasto-plastic FEM analysis and geo-mechanical experiments are performed on Baihetan and Xiaowan arch dams.Results show that unbalanced forces can be used as the indication of fracture initiation and propagation.
arch dam cracks fracture stability unbalanced force
Yuanwei Pan Yaoru Liu Qiang Yang
Department of Hydraulic Engineering,Tsinghua University,100084,China
国际会议
北京
英文
1-7
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）