With the development of traffic, many highways were built on the top of soil–rock slope (SRS). However, the effect of highway load on the SRS stability has never been studied comprehensively. Therefore, based on the statistical analysis, the stability of SRS considering additional loads of highway was studied. For generating a more realistic slope model, the identification algorithm of rock characteristic parameters was described considering rock ellipticity and long axis inclination angle; the corresponding rock contour establishing method and SRS establishing process were detailed, which could well consider rock content, ellipticity and long axis inclination angle. Applying the stochastic program, 522 stochastic numerical models and corresponding 12 physical models were created to study the influence of rock contents and long axis inclination angles on the SRS stability. The obtained results showed that the additional loads and dispersion degrees of stochastic analyzing results increased with the increase of rock contents, which were related to plastic developing modes (detour, through, scatter and contain modes) of SRS. By adjusting long axis inclination angles of rocks, it was observed that the minimum or maximum additional load was, respectively, obtained when this angle was parallel with or vertical to plastic belt. The effect of long axis inclination angles to the additional load (30.5%, 38.3% and 60.8% for 20%, 40% and 60% rock content) were concluded, which proved the necessity to consider long axis inclination angles of rocks in estimating SRS stability, especially in high rock content. According to numerical analysis results and the failure characteristic of physical models, three typical development modes of plastic belt of SRS were concluded when the load was on the top of slope, including deep, shallow and partial failure of SRS. In addition, it can also be found that the sliding body shows collapse (whole) modes when long axis inclination angles for rocks are vertical (parallel) to the plastic belt.

随着交通的发展，许多公路都建在土石坡（SRS）的顶部。然而，公路荷载对SRS稳定性的影响尚未得到全面研究。因此，在统计分析的基础上，对考虑公路附加荷载的SRS稳定性进行了研究。为了生成更真实的边坡模型，描述了考虑岩石椭圆度和长轴倾角的岩石特征参数识别算法；详细介绍了相应的岩石轮廓建立方法和SRS建立过程，可以很好地考虑岩石含量、椭圆度和长轴倾角。应用随机程序，建立了522个随机数值模型和相应的12个物理模型，研究了岩石含量和长轴倾角对SRS稳定性的影响。所得结果表明，随机分析结果的附加载荷和离散程度随着岩石含量的增加而增加，这与SRS的塑性发展模式（迂回、通过、分散和包含模式）有关。通过调整岩石长轴倾斜角度，观察到该角度与塑料带平行或垂直时分别获得最小或最大附加载荷。得出长轴倾斜角对附加载荷的影响（30.5%、38.3% 和 60.8% 的岩石含量为 20%、40% 和 60%），这证明在估计 SRS 稳定性时必须考虑岩石的长轴倾角，尤其是在高岩石含量的情况下。根据数值分析结果和物理模型的破坏特征，总结出SRS塑性带在坡顶荷载作用下的3种典型发育模式，即SRS深部破坏、浅部破坏和部分破坏。此外，还可以发现，当岩石的长轴倾角与塑料带垂直（平行）时，滑动体表现出坍塌（整体）模式。SRS 的浅层和部分失效。此外，还可以发现，当岩石的长轴倾角与塑料带垂直（平行）时，滑动体表现出坍塌（整体）模式。SRS 的浅层和部分失效。此外，还可以发现，当岩石的长轴倾角与塑料带垂直（平行）时，滑动体表现出坍塌（整体）模式。