A back-propagation neural-network-based displacement back analysis for the identification of the geomechanical parameters of the Yonglang landslide in China  

作　　者：YU Fang-wei PENG Xiong-zhi SU Li-jun 

机构地区：[1]Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China [2]Department of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China [3]CAS Center for Excellence in Tibetan Plateau Earth Sciences, Bering 100101, China [4]University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Journal of Mountain Science》2017年第9期1739-1750,共12页山地科学学报（英文）

基　　金：supported by the "Light of West China" Program of Chinese Academy of Sciences (Grant No.Y6R2250250);the National Basic Research Program of China (973 Program, Grant No.2013CB733201);the One-Hundred Talents Program of Chinese Academy of Sciences (LijunSu);the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No.QYZDB-SSW-DQC010);the Youth Fund of Institute of Mountain Hazards and Environment, Chinese Academy of Sciences (Grant No. Y6K2110110)

摘　　要：Xigeda formation is a type of hundredmeter-thick lacustrine sediments of being prone to triggering landslides along the trunk channel and tributaries of the upper Yangtze River in China. The Yonglang landslide located near Yonglang Town of Dechang County in Sichuan Province of China, which was a typical Xigeda formation landslide, was stabilized by anti-slide piles. Loading tests on a loading-test pile were conducted to measure the displacements and moments. The uncertainty of the tested geomechanical parameters of the Yonglang landslide over certain ranges would be problematic during the evaluation of the landslide. Thus, uniform design was introduced in the experimental design,and by which, numerical analyses of the loading-test pile were performed using Fast Lagrangian Analysis of Continua(FLAC3D) to acquire a database of the geomechanical parameters of the Yonglang landslide and the corresponding displacements of the loadingtest pile. A three-layer back-propagation neural network was established and trained with the database, and then tested and verified for its accuracy and reliability in numerical simulations. Displacement back analysis was conducted by substituting the displacements of the loading-test pile to the well-trained three-layer back-propagation neural network so as to identify the geomechanical parameters of the Yonglang landslide. The neuralnetwork-based displacement back analysis method with the proposed methodology is verified to be accurate and reliable for the identification of the uncertain geomechanical parameters of landslides.

关 键 词：Back-propagation neural network Displacement back analysis Geomechanical parameters Landslide Numerical analysis Uniform design Xigeda formation 

分 类 号：P642.22[天文地球—工程地质学]