滑坡弹性模量位移反分析及其应用  

Displacement Back Analysis of Landslide's Elastic Modulus and Application

作　　者：代云霞[1] 杜宇[2] 

机构地区：[1]广东省建筑设计研究院,广东广州510010 [2]中交第四航务工程勘察设计院有限公司,广东广州510230

出　　处：《人民珠江》2012年第4期38-41,共4页Pearl River

摘　　要：岩土体的弹性模量是岩土工程设计和施工中的重要参数,一般不易通过实验获取。以三峡库区某滑坡为例,结合实地调查资料,分析了滑坡变形特点,得出滑坡后缘主要为沉降变形,而中部、前缘主要以纵向变形为主的结论。基于正交设计和神经网络的位移反分析方法,既能科学地选取多介质滑坡反演参数,又能较好地模拟边坡岩体位移与力学参数之间的非线性关系,为弹性模量的反算和滑坡空间位移计算提供了一定依据。The elastic modulus of landslide is an important parameter in design and construction of geotechnical engineering, which is not easily obtained by experiment. Taking Zhao Shuling landslide in the Three Gorges reservoir as an example, based on the principle of orthogonal design, the back analysis parameters and levels are selected and the three - dimensional explicit difference method FLAC is used to do back analysis of inelastic displacement. The artificial neural network is trained by the calculation results of orthogonal de- sign, then the best parameter is obtained by back analysis. Finally, the spatial displacement under the condition of reservoir water level decreaseing from 175m to 145m accumulatively 30 days＇ rainfall is calculated. Combining with the field survey data, the deformation features of Zhao Shuling are analyzed. And it is concluded that the back edge of landslide is influenced by settlement, the middle part and front edge are influenced by longitudinal deformation. The back analysis of deformation based orthogonal design and BP neural net- work not only could select parameters of multiple medium landslide scientifically, but also will simulate the nonlinear relation between displacement and mechanical parameters well, which provide basis for back analysis of elastic modulus and calculation of spatial dis- placement.

关 键 词：弹性模量 正交设计 BP神经网络 位移反分析 

分 类 号：TV45[水利工程—水工结构工程]