沥青混凝土心墙与过渡层变形协调性及防渗的影响研究

发布时间：2018-04-01 02:32

本文选题：沥青混凝土心墙　切入点：均质坝　出处：《水力发电学报》2016年04期

【摘要】：采用三维有限元法对云南省某沥青混凝土心墙均质坝进行了心墙与两侧过渡层变形协调性的数值模拟分析,研究心墙的厚度对坝体防渗影响的变化规律。计算中坝体和心墙的本构模型采用邓肯张E-B模型,对不同厚度的心墙分别进行了模拟计算,并对比其相互之间的变形协调规律及心墙的防渗效果。计算结果显示,心墙厚度在0.3 m、0.4 m和0.5 m条件下,大部分水平位移满足变形协调性,顺河向水平位移值随着心墙厚度的增加而变大,拱效应越明显,说明对心墙水平位移越不利。心墙与过渡层的沉降随着高程的增加而变大,并且随着心墙厚度的增加,沉降的最大值随之减小。相对两侧的过渡层而言,心墙上部沉降小,底部沉降大,整个心墙在高度方向上有"被拉伸"的现象,这就为心墙产生拱效应提供了必要条件。心墙以受压应力为主,通过验算,并未发生水力劈裂破坏。坝体加入沥青混凝土心墙后,浸润线明显降低,防渗效果好,并且渗流量随着心墙厚度的增加而减小。
[Abstract]:Numerical simulation analysis of deformation coordination between core wall and transition layer of a asphalt concrete core dam in Yunnan Province was carried out by using three-dimensional finite element method. The influence of the thickness of core wall on seepage control of dam is studied. In the calculation, the constitutive model of dam and core wall is based on Duncan E-B model, and the core wall with different thickness is simulated and calculated separately. The results show that most of the horizontal displacement of the core wall meets the compatibility of deformation when the thickness of the core wall is 0.3 m and 0.5 m. The horizontal displacement along the river increases with the increase of the thickness of the core wall, and the arch effect becomes more obvious, which means that the horizontal displacement of the core wall is more unfavorable. The settlement of the core wall and the transition layer increase with the increase of height, and the thickness of the core wall increases. The maximum value of settlement decreases. Compared with the transition layer on both sides, the upper settlement of the core wall is small, the bottom settlement is large, and the whole core wall is "stretched" in the height direction. This provides a necessary condition for the arch effect of the core wall. The core wall is dominated by compressive stress, and hydraulic fracturing failure does not occur through checking calculation. After the dam is added to the asphalt concrete core wall, the infiltration line is obviously reduced and the seepage prevention effect is good. And the seepage flow decreases with the increase of the thickness of the core wall.
【作者单位】：昆明理工大学现代农业工程学院;河海大学水利水电学院;
【基金】：国家自然科学基金(51569010)
【分类号】：TV64

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