台阶状斜坡应力场分布规律研究

STUDY ON THE DISTRIBUTION LAW OF STRESS FIELD IN STEPPED SLOPE

台阶状斜坡是工程中常见的斜坡形式之一,人类工程活动中常会将台阶状斜坡作为工程环境。了解台阶状斜坡的应力分布特征,对利用好台阶状斜坡的工程环境具有指导意义。本文采用数值模拟方法研究了台阶状斜坡(2阶)应力分布规律。建立二维均质弹性模型,施加水平向构造应力场,研究了坡度为45°、60°、75°、90°,台阶宽度为40、50、60、70、80m时不同组合情况下斜坡应力的分布规律,发现坡角越陡,坡脚应力集中程度越高,集中范围越大;坡面附近(坡缘)张力带也随之扩大和增强。坡角越陡,台阶附近应力集中程度越低,集中范围越小。台阶宽度对应力集中范围无明显影响。台阶宽度越大,坡脚应力集中程度越低,台阶附近应力集中程度越高。

Stepped slope is one of the common forms of slopes in engineering. Stepped slopes are often used as engineering environments in human engineering activities. Understanding the stress distribution characteristics of stepped slopes has guiding significance for the engineering environment using stepped slopes. In this paper, the numerical simulation method is used to study the stress distribution law of stepped slope. A two-dimensional homogeneous elastic model was established, and the horizontal tectonic stress field was applied. The slope was 45°, 60°, 75°, 90°, and the step width was 40m, 50m, 60m, 70m, 80m. The distribution law of slope stress under different combinations shows that： The steeper the slope angle, the higher the stress concentration of the slope foot, the larger the concentration range; the tension band near the slope surface （slope edge） also expands and enhanced. The steeper the slope angle, the lower the stress concentration near the step and the smaller the concentration range. The step width has no significant influence on the stress concentration range. The larger the step width is, the lower the stress concentration of the slope foot is, and the higher the stress concentration near the step.