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.
