摘要
广源水电站拱坝坝基岩体风化、卸荷程度较强,弱风化层厚度较大,岩体的变形模量差异大。本文采用有限元法分析坝基弹性模量对拱坝静力特性的影响,为广源水电站拱坝的布置提供依据。分析结果表明:坝顶以上区域的岩体只对拱坝上部坝肩的位移和应力有一定影响;两岸坝肩、河床及以下区域岩体对拱坝各部位的位移和应力均有影响,随着这两个区域岩体弹性模量增加,坝体三个方向的位移都会减小;当两岸坝肩岩体弹性模量增加时,上部、中部坝肩的拉应力增加,下部坝肩和拱冠梁底部的拉、压应力在数值上均减小;当河床及以下区域岩体弹性模量增加时,中部、下部坝肩以及拱冠梁底部的拉应力增加;广源水电站拱坝坝基弹性模量处于影响敏感区。
The arch dam foundation rock mass of Guangyuan Hydropower Station has a strong degree of weathering and unloading,and has a relatively thick weakly weathered layer.The deformation modulus of the rock mass varies greatly.The influence of the elastic modulus of dam foundation on the static characteristics of arch dam was analyzed by finite element method to provide basis for dam layout.The results of analysis demonstrate the rock mass above the dam crest only has certain effect on the displacement and stress of the upper abutment of arch dam;the rock mass at both abutments,river bed and the positions below have effects on the displacement and stress of various parts of arch dam,and the displacement of dam body in three directions will decrease with the increase of elastic modulus of rock mass here;when the elastic modulus of the rock mass at both dam abutments increase,the tensile stress of upper and middle abutments will increase,while the tensile and compressive stress at the lower abutment and the bottom of arch crown beam decrease numerically;as the elastic modulus of rock mass at river bed and below position increases,the tensile stress at the middle and lower abutments as well as the bottom of arch crown beam increase;the arch dam foundation elastic modulus of Guangyuan Hydropower Station is in the sensitive area.
作者
何飞龙
覃振威
张小飞
田羽
黄佳敏
He Fei-long;Qin Zhen-wei;Zhang Xiao-fei;Tian Yu;Huang Jia-min(College of Civil Engineering and Architecture,Guangxi University,Nanning 530000,China)
出处
《广西水利水电》
2020年第5期8-12,共5页
Guangxi Water Resources & Hydropower Engineering
关键词
拱坝
弹性模量
静力特性
有限元法
广源水电站
Arch dam
elastic modulus
static characteristics
finite element method
Guangyuan Hydropower Station
