典型涉水滑坡机理及演化规律研究

Study on Mechanism and Evolution of Typical Wading Landslide

为探究涉水滑坡的形成机理和变形的动态变化规律,首先研究岩土工程中常用的弹塑性理论及三维非饱和渗流理论的基本原理。其次,基于Rhino软件利用高精度等高线建立卡子湾滑坡的真三维地质模型。然后,基于三维有限差分软件FLAC3D,应用Fish语言编写计算程序。最后,将库水调度周期的五个阶段概化为具体工况,并计算分析卡子湾滑坡的位移和塑性区变化特点。结果表明:库水位的升降均对滑坡的变形均有明显影响,其中快速下降阶段的影响最为显著;卡子湾滑坡为动水压力型牵引式滑坡。

In order to explore the formation mechanism of wading landslide and the dynamic change law of deformation,the basic principles of elastic-plastic theory and three-dimensional unsaturated seepage theory commonly used in geotechnical engineering were firstly studied.Secondly,based on Rhino software,the true 3D geological model of kaziwan landslide was established by using high precision contour line.Then,grounded on the three-dimensional software FLAC3D with finite difference method,the calculation program was written by Fish language.Finally,the five stages of reservoir water dispatching cycle were generalized into specific working conditions,and the displacement and plastic zone variation characteristics of the landslide in kaziwan were calculated and analyzed.The analysis results show that the rise and fall of reservoir water level has obvious influence on the deformation of the landslide,and the influence during the rapid decline stage is the most significant.The slide of kaziwan is a traction landslide under dynamic water pressure.