平面滑动型涉水岩质滑坡速度计算模型研究

很多大水库有大量的库岸滑坡涉水,水阻力无疑是涉水滑坡运动速度的一个最重要影响因素.将水中运动块体迎水面所受的总阻力分为静水阻力和运动阻力两部分,基于块体水下运动阻力实验,分析了不同运动速度和不同涉水深度对水下运动块体迎水面所受到的水阻力的影响,确定了水下运动块体迎水面的水阻力计算模型；以平面滑动型涉水岩质滑坡为模型,分析了水下部分静水压力的计算模型,结合滑坡运动的动力学和运动学方程,提出了平面滑动型涉水岩质滑坡运动速度计算模型.

Study on Speed Model of Fording Rock Landslide Moving along the Planar Slip Surface

There are a great number of fording landslides in Three-gorge reservoir.Water resistance is one of the most important factors which affect landslide velocity,and water resistance of the moving block in water is divided into calm water resistance and moving resistance.Based on experiments of moving block in water,the effect of moving block’s velocity and water depth on water resistance of attaining surface is discussed,and the calculating model is solved to the resistance of water attaining surface when block moves at a certain speed in water or when it moves at a certain water depth.Taking the plane slide model of fording rock landslide as an example,the sliding mass in water is selected to analyze the hydrostatic pressure.Kinetics equation and kinematics equation are used to calculate the movement of sliding mass both in water and above water.At last,the speed model of fording rock landslide is put forward when it moves along the planar slip surface.