丹巴滑坡的位移特征

滑坡位移资料可为分析滑坡运动规律、发展趋势和预测预报提供依据。通过对丹巴滑坡治理过程中滑坡前部、中部和后部的位移监测资料分析,滑坡位移速度可划分为两个阶段:位移速度增加阶段和减少阶段。分析了各部位的各个阶段运动特征及其影响因素。对各部位位移速度在增加阶段和减小阶段的速度与时间关系的曲线拟合,表明滑坡在位移速度增加阶段具有相似的运动特征,拟合方程都较好地符合指数方程,而在速度减小阶段受治理工程的影响差别较大,拟合方程分别为对数、线性和指数方程。以监测数据的初始值和累计最大值,利用Lo-gistic模型对各部位的累计位移进行预测,预测值与实测值的拟合程度较高,表明丹巴滑坡在治理过程中的整个累计位移较好地遵循Logistic增长过程。从位移监测资料可以看出,滑坡治理工程有效地控制了滑坡的活动。

The Displacement Characteristic of Danba Landslide

The landslide displacement data was analyzed for landslide movement,development and prediction.This paper analyzed the displacement data of the foreside,middle and tail of Danba landslide in the treating engineering.The velocities of the landslide displacements were divided into two phases: the increase phase and decrease phase of the displacement.Using displacement curve,the movement and influence factors of each phase of each section were analyzed.The curve equations had been found between displacement velocity and time in the phases of the increase and decrease of the velocity in each section.These equations indicated that the sections have the identical movement in the increase phase and the equations all accorded with exponential equation.However,because of the engineering,these equations have obvious difference in the decrease phase.The equations of the foreside,middle and tail of the landslide separately accorded with logarithm,linearity and exponential equation.On the basis of original displacement value and accumulative maximum displacement value,there are the better fitting between prediction value and monitoring data when the accumulative displacements of each section are predicted by the Logistic model.It indicated that the accumulative displacements of Danba landslide accorded with Logistic increase process.Moreover,from the monitoring data of displacements,the treating engineering of Danba landslide effectively controls the movement.