Research on Laws and Computational Methods of Dynamic Surface Subsidence Deformation

Abstract

In order to reveal comprehensively the process laws of the dynamic surface subsidence deformation,based on the model experiments of similar materials and the data measured on the site,the whole process of the development of dynamic surface subsidence deformation was divided into three stages as follows: subsidence development,full subsidence and subsidence attenuation.The results show that the subsidence of main profile along the strike in above three stages could be calculated respectively by the negative exponent function;The four dynamic deformation parameters including W,L,a and b can be expressed as logarithmic,exponential and linear functions respectively for different propellant distance in the surface subsidence expression in the subsidence development stage,while W,L,a and b in the surface subsidence expression in the full subsidence stage are 5 460 mm,440 m,5.57,and 5.1 respectively,and the four dynamic deformation parameters can be expressed as the logarithmic function in the surface subsidence expression in the subsidence attenuation stage;In addition,the variation process of the biggest subsidence velocity is also divided into the same three stages.