填筑方法及水位变化对土石坝应力变形的影响

Influence study on the earth-rack dam of stress and deformation under different filling method and water level change

利用有限元Abaqus软件,对不同填筑方式和水位变化下的土石坝进行应力应变分析。分析结果表明,对一次性加载和分层加载两种方式下的土石坝进行应力应变分析,分层加载时土石坝的沉降量远远低于一次性加载时的沉降量,分层加载的填筑方式更适合工程需要。水库蓄水后,土石坝竖向位移无明显变化,水平位移增加较大,上游坝体的应力影响较大,下游坝体应力影响较小,拱效应消失。水位下降后,土石坝的位移无明显变化,在坝体上游应力变化明显,水位下降时对上游坝坡的稳定不利,需要加强防护。

Stress and strain analysis of earth-rock dam with different filling methods and water level is carried out by using finite element abaqus software. The results show. Stress-strain analysis of earth-rock dam under one-off loading and layered loading is carried out. The settlement of earth-rock dam under layered loading is much lower than that under oneoff loading. The filling method of layer loading is more suitable for engineering needs. After the reservoir water is stored.The vertical displacement of earth-rock dam does not change obviously, but the horizontal displacement increases greatly.The stress of upstream dam is greatly affected, but the stress of downstream dam is less affected. The arch effect is disappeared. When the water level drops. The displacement of earth-rock dam has no obvious change. The stress change is obvious in the upstream dam. It is unfavorable to the stability of the upstream dam when the water level drops. So it is necessary to strength the projection.