论文部分内容阅读
滑坡灾害危害程度评估需要掌握滑坡运动特征,而目前的研究主要基于定性分析模型,很难进行定量预测。为克服这一困难,建立一种简化的三维弹簧变形块模型,定量预测滑坡失稳后滑体运动过程。假设滑坡的运动形式是连续的,且滑体是可变形的,将滑体分为侧面竖直的三维条柱。考虑滑体内在变形,对三维运动方向受力和变形进行分析。根据作用于条柱侧面的力–变形关系,获得条柱在滑动过程中的变形与受力状态。考虑到条柱中能量的积累和释放,同时考虑摩擦引起的能量耗散,建立任意时刻滑体的加速度、速度和位移计算公式,获得滑坡在三维滑动过程滑动的最大距离、运动的最大速度及滑动历经的时间等。为实现滑坡滑动过程的三维可视化,基于Visual Basic语言程序编制滑坡失稳后运动过程分析程序,分析武隆鸡尾山滑坡的滑动距离、滑动的最大速度以及滑动历经的时间,对比分析表明,该模型与现有的软件模拟结果比较吻合。
Landslide hazard assessment needs to know the characteristics of landslide movement, and the current research is mainly based on qualitative analysis model, it is difficult to quantitatively predict. In order to overcome this difficulty, a simplified model of three-dimensional spring deformation was established to quantitatively predict the movement of landslide after landslide instability. It is assumed that the landslide is continuous in form of motion, and the slider is deformable, dividing the slider into vertical three-dimensional struts. Considering the internal deformation of the sliding body, the force and deformation of the three-dimensional moving direction are analyzed. According to the force-deformation relationship acting on the side of the strut, the deformation and stress state of the strut during sliding are obtained. Taking into account the accumulation and release of energy in the bar, taking into account the energy dissipation caused by friction, the formula of acceleration, velocity and displacement of the sliding body at any time is established to obtain the maximum sliding distance of the landslide in the three-dimensional sliding process, the maximum speed of movement and Sliding elapsed time and so on. In order to realize the 3D visualization of the landslide sliding process, the program of analyzing the movement process after the landslide instability was compiled based on Visual Basic language program, and the sliding distance, the maximum speed of sliding and the travel time of Jiyoushan landslide were analyzed. The comparative analysis shows that this model Compared with the existing software simulation results.