摘要
以溪洛渡围堰的设计对比方案为例,采用二维和三维有限元方法计算堰体和防渗墙的应力位移,揭示防渗墙应力位移随主要影响因素的变化规律。研究表明:防渗墙的水平位移主要由堰体型式决定;防渗墙材料的模量越高,其适应堰体变形的能力越差,安全性就越低;降低防渗墙上部材料的模量能在一定程度上降低防渗墙的应力;墙厚在合理范围(0.8￣1.2 m)内变化,对防渗墙的应力位移影响很小;三维效应对防渗墙的中间断面应力位移影响较小,但两岸陡坡处可能变危险。上述结论可为同类土石坝和围堰的方案设计和优化提供参考。
Stress and deformation analyses were performed on the design schemes of Xiluodu upstream cofferdam by using 2-D and 3-D FEM. Based on the calculation results, main factors influencing the stress and deformation of the diaphragm wall under a dam were revealed. The major findings include the followings： （1） the horizontal displacement of the diaphragm wall is governed by the dam type; （2） the higher the wall＇s modulus, the more dangerous the wall becomes; （3） the stress in the wall can be significantly reduced by decreasing the modulus of the filled materials above the wall; （4） a change of wall thickness within a reasonable range （from 0.8 m to 1.2 m） has little effect on the stress and displacement of the wall ; （5） 3-D effect of the valley is of little significance for the stress and deformation of the middle wall section, whereas sections near steep slopes may become more dangerous .
出处
《土木工程学报》
EI
CSCD
北大核心
2006年第4期73-77,共5页
China Civil Engineering Journal
关键词
防渗墙
应力变形
围堰
土石坝
溪洛渡
diaphragm wall
stress-deformation
cofferdam
embankment
Xiluodu hydropower station
