岩移“四带”模型与动态位移反分析

FOUR-ZONE" MODEL OF ROCKMASS MOVEMENT AND BACK ANALYSIS OF DYNAMIC DISPLACEMENT

为应用岩石力学数值分析方法进行岩层与地表移动计算，采用位移反分析方法，进行了模型识别和理论分析研究。认为：（１）采后覆岩结构具有分带性，结构力学模型应划分为破裂带、离层带、弯曲带和松散冲积层带；（２）岩石的本构方程可以应用内时理论和开尔文－伏尔特流变模型得到；（３）对于线性、粘弹塑性力学问题可应用三点抛物线方程法求得最优估计值；（４）地表水平移动是岩层与松散冲积层倾斜变形引起的，水平移动值取决于倾斜和表土层翘曲变形两种因素。

To calculate rockmass and surface subsidence by using numeric analysis of rock mechanics, back analysis of displacement is used to study identification and theoretical analysis. The main results are:(1) The mechanical model of overburden after mining should be divided into four zones, namely, failure zone, separation zone, bending zone and loose alluvium zone; (2) The constitutive equation of rock can be obtained by applying endochronic theory and Kelvin-Voigt rheological model;(3) For mechanical problems, such as linearity, visco-elasticity and plasticity, three-point parabola equation can be used to get the optimal estimated value; (4)The horizontal displacement of surface results from inclined deformation of rockmass and topsoil. The horizontal displacement value depends on two factors, inclined deformation and topsoil warped deformation.