侧约束对拱坝坝体应力和位移的影响  

Stresses and displacements in RCC arch dams with side restrictions

作　　者：刘光廷[1] 徐增辉[1] 胡昱[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2002年第11期1537-1540,共4页Journal of Tsinghua University(Science and Technology)

基　　金：清华大学"九八五"科研基金

摘　　要：结合某碾压混凝土拱坝的拱座,在减弱和加强侧约束时,即在坝体部分高程的破碎软弱岩石减弱坝体侧约束以及坝体下游边墙和护坦增强坝体侧约束的情况下,研究侧约束对于坝体应力和位移的影响。从仿真计算结果可以看出,减弱侧约束时,坝体会自动地进行应力调整,实现坝体的应力重分布,不会产生应力的集中;同时由于拱向应力的增大,即增大了抗剪面剪应力,抵消了坝体下游破碎岩石的影响。而增强侧约束,可以减少坝体位移,特别是坝肩位移。The stresses and displacements in an RCC arch dam were anzlyzed with strengthened or weakened side restriction. The crushed rock in the side abutment weakens the side restriction while the side wall and the apron strengthen the side restriction. The analysis showed a new stress distribution with automatic modification and less stress concentration when the side restriction is weakened by using crushed rock in the abutment. Increasing the arch thrust augments the shear stress on the surface of the shearing resistance part, which counteracts the influence of the crushed rock. Strengthening the side restriction reduces the displacements, especially the displacement of the abutment. 

关 键 词：坝体应力 侧约束 碾压混凝土拱坝 护坦 边墙 破碎岩石 坝体位移 

分 类 号：TV642.4[水利工程—水利水电工程]