为进一步研究强夯对周边黄土边坡稳定性的影响，本文采用极限平衡圆弧条分法对强夯作用下的边坡安全系数进行推导计算。结合工程实例，使用TC-4850爆破测振仪对现场监测点进行加速度测试。考虑高程差和测点距离的共同影响，采用matlab编程对现场数据进行多元回归分析，求出强夯作用下边坡质点振动加速度解析式。在求得最小安全系数的基础上，研究不同强夯动荷载方向对黄土边坡稳定性的影响。研究结果表明：在相同荷载作用下，强夯动荷载方向与水平轴正方向夹角为0o、45o、60o、270o、315o、330o、360o时，安全系数均小于等于1，且随着拟静力系数不断增大，安全系数越来越小。强夯动荷载方向与水平轴正方向夹角为90o、135o、150o、180o、225o、240o时，安全系数均大于1.05。随着拟静力系数不断增大，安全系数也随之增大。该方法简单易行，便于计算，可用于黄土边坡实际工程。
Abstract
In order to further study the influence of dynamic compaction on the stability of surrounding loess slope, the limit equilibrium arc strip division method was used to deduce and calculate the slope safety factor under dynamic compaction.Combined with the engineering example, TC-4850 blasting vibration meter was used to test the acceleration of the site monitoring points.Considering the common influence of elevation difference and measuring point distance, the matlab programming was used for multiple regression analysis of the field data.The analytical formula of vibration acceleration of slope particles under dynamic compaction was obtained in the paper. On the basis of obtaining the minimum safety factor, the influence of different directions of strong rammed load on the stability of loess slope was studied.The results showed that under the same load, when the angle between the direction of strong rammed load and the positive direction of the horizontal axis is 0o、45o、60o、270o、315o、330o、and 360o , the safety factor is less than or equal to 1. With the increasing of the pseudo-static coefficient, the safety factor becomes smaller and smaller. When the angle between the direction of strong rammed load and the positive direction of the horizontal axis is 90o、135o、150o、180o、225o and 240o , the safety factor is greater than 1.05. With the increasing of the pseudo-static coefficient, the safety factor also increases. The method is simple and easy to calculate. It’s can be directly used in practical engineering. This method can be applied to the practical engineering of loess slope.
关键词
极限平衡 /
强夯动荷载方向 /
安全系数 /
拟静力系数
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Key words
Limit equilibrium;Dynamic load direction of strong ramming /
Factor of safety /
Quasi-static coefficient;
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参考文献
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