摘要
根据规范规定并查阅文献,选取坝体坡率m(0.7、0.75、0.8、0.85)、地基弹性模量E(微风化~新鲜岩体,24、36、48、60 GPa)作为影响因素,进行2因素4水平的正交方案设计,采用有限元分析130 m坝高的三维胶凝砂砾石坝体的应力、位移。应力分析显示:除yz面剪应力外,其余应力的最大值、最小值,变化趋势相同;等幅度增大地基弹性模量,各应力变化的幅度逐渐减小;根据应力变化幅度、规范规定,优选E=36 GPa;拉应力最大项在m=0.75时为最小值。位移分析显示:等差增加E,各位移绝对值等比例减小,及根据参考文献,优选地基弹性模量值为36 GPa;根据受拉位移最大项(UY),位移分析选择坝体坡率m=0.75。综合建议优选的坝体坡率m=0.75、地基弹性模量E=36 GPa。
Stress and displacement of 130m high cement-sand-gravel are analyzed by finite element method to use the orthogonal scheme with 2 factors and 4 levels.The slope ratio m(0.7,0.75,0.8,0.85),elastic modulus E(micro-weathered to fresh rock mass,24,36,48,60 GPa)of the dam body are chosen as the influencing factors according to the literatures and the norms.The analysis of the stresses show that the maximum and minimum values of other stresses have the same trends of changes,except YZ plane shear stress;increasing the elastic modulus of foundation with equal amplitude,the amplitude of stress variation is decreased gradually;according to the range of stress variation and the norms,the optimum selection is E=36GPa;the maximum term of tensile stress is the minimum when m=0.75.The analysis of the displacements show that the absolute value of each displacement is decreased in equal proportion with the increase of equivalence E,and the optimum elastic modulus of foundation is 36GPa based on the references;the slope ratio m=0.75 is selected for displacement analysis according to the maximum term of tension displacement(UY).The optimum slope ratio m=0.75 and elastic modulus E=36GPa for dam body and foundation are suggested.
作者
杨冬升
YANG Dongsheng(School of Materials and Architectural Engineering,Guizhou Normal University,Guiyang City,Guiyang 550001,China)
出处
《四川建材》
2019年第8期80-83,共4页
Sichuan Building Materials
基金
贵州省本科教学工程建设项目(2016JG16)
贵州师范大学2014年博士科研启动项目
关键词
胶凝砂砾石
高坝
坝体坡率
地基弹性模量
应力与位移
cement-sand-gravel
high dam
slope rate of dam
elasticity modulus of foundation
stress and displacement
