Abstract
Crack is an important factor in slope stability analysis. The permeability of expansive soil is small, and its rainfall infiltration is limited during rainfall. Cracks provide a great channel for rainfall infiltration, which increases the infiltration depth and porewater pressure, further affecting the deep soil and ultimately leading to expansive soil landslides. A stability analysis method that considered the crack effect for the expansive soil slope is established, which based on the upper bound theory of limit analysis. And the effects of crack depth and crack angle on the stability of the expansive soil slope are explored and discussed. The results show that: The safety factor decreases with the increase of crack depth, and is the smallest under the consideration of the influence of earthquake action and deformation force. The effect of the crack angle on the slope safety coefficient are insignificant. When the crack angle greater than 70°, the safety factor becomes smaller. Compared with the crack angle, the crack depth exerts a greater influence on the slope safety factor.
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