土石坝分层填筑位移场修正的一种新方法

A NEW APPROACH FOR MODIFICATION OF DISPLACEMENT IN INCREMENTAL CONSTRUCTION ANALYSIS OF EARTH-ROCK DAM

在进行土石坝分层填筑情况下的应力变形有限元计算时,需要对新填土层做位移修正.考虑牵连位移和相对位移两个方面对新填土层中质点位移的影响,推导了一维情况下线弹性材料一次加荷与多级加荷时沉降的理论解,建立了针对新填土层的一种新的位移修正方法,应用该方法修正分层填筑位移场可以消除位移等值线不合理的锯齿状特征,并结合典型算例与已有方法进行了对比分析.结果表明,新的位移修正方法具有较好的修正效果.

The incremental construction analysis is widely applied in the Finite Element Analysis of stress and deformation in the construction of earth-rock darns.The simulated displacement field may not be suitable for the use in the practice due to the new filling soil.Thus,the computed displacement field in the new filling soil should be modified.Based on the fact that the total displacement consists of the convected displacement and the relative displacement,the theoretical settlement solutions in the 1-D condition are obtained in two different construction cases.One is in a single lift and the other is in multi lifts.These solutions show that the convected displacement has a great effect on the total displacement.A new approach for modification is proposed,and a comparison with existing approaches is made for a typical example.The results indicate that the new approach is more accurate and effective to eliminate unrealistic features in contours of displacement.