关键词: 长大裂隙, 滑坡, 三维数值模拟, 斜坡破坏模式

Abstract: The slope failure modes under the control of long and large cracks in Ganlong landslide hazards are analyzed based on the measured geological tectonic structure and threedimensional numerical simulation. The results show that:(1) the landslide is a V-shaped tensile shear landslide controlled by the long and large cracks; (2) after the landslide starts, the central sliding body in the I zone slides along the free face of the long and large cracks cut rock mass, and the mountain at the back edge is damaged by the traction and tension. The sliding body turns to the right edge of the landslide when it meets the barrier of the steep wall at the left edge, and then pushes and shears the front slope body in the I zone, and finally deposits to the channel in a “7” shape；(3) with the increase of the penetrating length and the depth of the fracture, the length and depth of the cut rock mass, the free surface of the rock mass, and the wedge form formed by the combination with the plane, the peak displacement and the deformation area near the boundary of the landslide increase in different degrees, once the cracks developed through the sliding surface, a wedge shaped landslide will be formed.

Key words: Long and Large Cracks, Landslide, Three-Dimensional Numerical Simulation, Slope Failure Modes