空间与颗粒参数对块石土边坡稳定性影响数值模拟研究

块石土边坡具有物理力学性质复杂，非线性强等特性，受块石-土体空间分布、块石粒径等几何因素影响较大。为研究几何参数对块石土边坡稳定性影响，本文基于研究团队提出的块石形状数据库随机生成方法，采用ABAQUS软件非线性分析方法，考虑含石量、最大粒径、空间分布等多种几何因素，建立大量有限元模型进行计算分析，得到以下结果：含石量增大，边坡安全系数上升，且含石量在50%-60%这个区间是上升速率最快。含石量增大，同粒径组边坡安全系数标准差增大，模型安全系数差异变大；最大粒径增大，块石分布对于边坡安全系数的影响增大，边坡稳定性先减小后增强，同粒径组边坡安全系数标准差增大。含石量和最大粒径增大，块石空间分布对于边坡稳定性影响增大。粒径大小不同，块石空间分布对于块石土边坡稳定性影响方式也不同，大粒径块石存在令滑动面向边坡内部发展，而密集小粒径块石大多是令滑面呈折线形，二者皆可增大边坡稳定性；当块石长轴与坡面夹角为90°、135°时，边坡塑性区呈发散分布，滑面更靠内部，稳定性更好，而当块石长轴与坡面夹角为0°、45°，则与上述情况相反；在通常沉积条件下，边坡稳定性随长短轴比增加而降低，滑动面越发平滑，塑性区范围与更加集中。可以看出，含石量、块石粒径、空间分布等因素对于块石土边坡有很大影响。几何参数不同，边坡稳定性差异较大，且具有一定规律性，在实际工程中有一定参考价值。

Analysis of Space and Particle Parameter Influence to Stability of Soil-rock Mixture Slope

The soil-rock mixture slope has the characteristics of complex physical and mechanical properties and strong nonlinear.It is greatly affected by geometric factors such as rock distribution and rock particle size. In order to study the effect of geometric parameters on the stability of soil-rock mixture slopes, this paper uses the ABAQUS software nonlinear analysis method based on the random generation method of block-shape database proposed by the team. Considering a variety of geometric influencing factors such as rock content, maximum rock particle size and rock distribution, a large number of calculations were done. Result shows that: With the increase of rock content, the safety factor of slope increases. The rate of increase is fastest in the range of 50%-60% rock content. With the increase of the maximum particle size, the influence of rock distribution on the safety factor of slope increases. The stability of slope first decreases and then increases, and the standard deviation of safety coefficient increases. With the increase of the maximum particle size, the impact of the rock distribution on the safety factor of the model increases, the stability of the slope first decreases and then increases, and the standard deviation of the safety factor of the slope of the same particle size group increases. With the increase of rock content and maximum particle size, the influence of rock distribution on slope stability increases. The influence of the rock distribution on the stability of the soil-rock mixture slope varies with the rock particle size. The existence of large size rock makes the sliding face the move away from free face of slope, while the dense small size rocks mostly make the sliding face hackly, both of which can increase the stability of the slope. When the rock long axis and slope Angle is 90° and 135°, the plastic zone of slope diverges, the sliding surface is more internal, and the slope stability is better.When the Angle between the long axis of the block stone and the slope is 0° and 45°, it is contrary to the above situation. Under normal sedimentary conditions, slope stability decreases with the increase of the ratio of axial length to axial length. The sliding face becomes smoother and the plastic zone becomes more concentrated. It can be concluded that rock content, rock particle size and rock distribution have great influence on the slope stability. With different geometric parameters, slope stability varies greatly and has certain regularity, which has certain reference value in practical engineering.