堤坝型堆积体接触应力分布规律的数值研究

将堤坝型堆积体分为三类情形,基于有限差分法求解了三种情形下的接触应力分布规律及其影响因素,得出以下结论:同三棱柱堆积体类似,堤坝型堆积体的法向接触应力,并非人们认为的线性分布,而是呈曲线分布,堤坝高度开始出现变化的附近(对应三棱柱堆积体的中心)存在应力凹陷的现象;当相比于三棱柱堆积体,堤坝型堆积体的应力凹陷程度受到缓解(因堤坝自身的反压),同时应力凹陷的延伸范围也仅限于0.5~1倍堤坝高度的范围;对比底边有无水平约束两类情形,说明了接触面上的切向应力加重了应力凹陷的程度;下伏岩土体的刚度(弹模)也将影响到应力凹陷的程度,刚度相较上覆堆积体越大,应力凹陷越严重。

Numerical study on the distribution of embankment deposit contact stress

With finite difference method, this paper focuses on the distribution contact stress of embankment deposit for three cases and its factors, with following findings: similar to findings in triangular prism deposit, the normal contact stress of embankment deposit is not a curve rather than a line, there is stress depression of normal contact stress at the place where the height of embank starts to decrease, corresponding to the center of triangular prism deposit; however, because of back selfweight of the embankment, the depression is kind of released when the normal contact stress under embankment deposit is compared to that under triangular prism deposit, and the range of stress depression is only limited to the horizon equal to 0.5~1 times of the height of the embankment; it is found that the shear contact stress at the bottom will enhance the depression of normal contact stress; also, the modulus of the underlying geotechnical material will impact the depression, and the larger the modulus of the underlying compared to the above deposit, the more obvious the depression of normal contact stress.