地形因子对偏转型滑坡-碎屑流运动参数的影响

根据滑坡地形特征，将沟谷偏转型滑坡划分为坡脚偏转型、凹面偏转型和凸面偏转型三种类型，其主要地形参数为滑源区坡度、斜坡坡度、沟谷坡度和偏转角度。通过数值模拟，采用正交分析、极差分析和方差分析初步探讨主要地形参数对沟谷偏转型滑坡运动参数的影响。结果表明:沟谷偏转型滑坡的视摩擦系数、前缘速度恢复系数均主要受地形起伏的影响。斜坡坡度对视摩擦系数的影响最大，沟谷坡度次之，偏转角度最小；斜坡坡度、沟谷坡度对前缘速度恢复系数的影响大于偏转角度的影响。斜坡坡度是视摩擦系数的显著性因素，斜坡坡度、沟谷坡度是前缘速度恢复系数的显著性因素。视摩擦系数、前缘速度恢复系数与主控地形因子之间存在显著的非线性关系，可分别用二次函数、二次型函数进行描述。

Influence of terrain factors on the motion parameters of the turning-type landslide-debris flow

According to the terrain features of landslides, the deflection-valley landslides are divided into three types, including the slope turning-type, concave turning-type and steep slope turning-type. The main terrain parameters are slope of sliding source area, slope gradient, lengthwise grade slope of valley and deflection angle. Through numerical simulation, influence of main terrain parameters on the movement parameters of deflection-valley landslides are preliminarily examined by the orthogonal analysis, the difference analysis and the analysis of variance. The results show that the apparent friction coefficient and mass-front velocity recovery coefficient are mainly affected by the topographic relief. The slope gradient has the greatest influence on the apparent friction coefficient, and the lengthwise grade slope of valley is the second, and the deflection angle is the smallest. The slope gradient and lengthwise grade slope of valley have the greatest influence on the mass-front velocity recovery coefficient, and the deflection angle is the smallest. The slope gradient is the significant factor for the equivalent friction coefficient, and the slope gradient and valley gradient are the significant factors for the mass-front velocity recovery coefficient. There is a significant nonlinear relationship among the apparent friction coefficient, the mass-front velocity recovery coefficient and the decisive terrain factors, which can be described using the quadratic function and the quadratic form function, respectively.