斜坡临滑形变能释放与滑体起程速度关系的探讨  

Exploration on relationship between deformation energy release in critical landslide phase and starting velocity of landslide mass

作　　者：潘岳[1] 王志强[1] 戚云松[1] 

机构地区：[1]青岛理工大学土木工程学院,青岛266520

出　　处：《岩土力学》2010年第7期2122-2128,共7页Rock and Soil Mechanics

基　　金：山东省自然科学基金(No.Y2005-A03)资助项目;山东省教委重点资助项目(No.G04D15)

摘　　要：斜坡内聚集的巨大剪切形变能在临滑时释放,坡体能量释放率具有力的量纲,在坡体能量释放率幅值大于锁固段潜滑带抗剪强度幅值的情况下,坡体临滑释放的形变能将大于潜滑带岩体破裂需要的能量,所大于的部份将转变成滑体动能,滑动为剧动式滑坡;反之,则为缓动式滑坡。剧动式滑坡横截面上的弹冲速度与该点切应力的大小成正比。潜滑面附近坡体介质的切应力和切应变能密度最大,滑动时获得的弹冲速度也最大。导得蕴涵丰富信息量的斜坡弹性势能变化率曲线及其表达式,通过解析及Matlab图解形式对坡体的形变能聚集、临滑形变能释放量及其与滑体启动速度、启动方式进行了阐述。The great shearing deformation energy accumulated in the slope will be released in critical landslide phase; and energy releasing rate of the slope body has the dimension of force. When the amplitude of energy releasing rate of the slope body is greater than the shearing strength of latent slide belt of locked segment, the deformation energy released by the slope body in critical landslide phase will be greater than the energy needing for failure of rock of latent slide belt; and the superfluous energy amount will convert into kinetic energy of landslide mass; and the landslide like this is called acute-moving landslide. Contrarily, the landslide is called slow-moving landslide. The impulse velocity at the cross section of acute-moving landslide is in direct proportion to the tangential stress intensity at it. The tangential stress and the tangential strain energy density of slope body media near to the latent slide surface are the biggest; the impulse velocity of acute-moving landslide is the biggest too. The curve of elastic potential change rate of slope and its expression, which have wealth of information, are deduced. The deformation energy accumulation of the slope body, and the relationship between the deformation energy releasing amount in critical landslide phase and starting velocity including starting method of landslide mass, are described in forms of analysis and illustration drawn by the Matlab software.

关 键 词：聚能 形变能释放 剧动式滑坡 启程速度 缓动式滑坡 

分 类 号：P642[天文地球—工程地质学]