Creep Characteristics Of Rock Mass And Its Influence On Surface Subsidence

In allusion to the instance of viscoelastic deforming caused by underground excavation,the visco-elastic formula for surface subsidence due to underground excavation was broughtforward in this dissertation, and the underground excavation engineering example was givento study the regularity of creep deformation on surface subsidence due to manual excavation.First of all, surface subsidence creep properties of the deep iron mine and shallow highwaytunnel were analyzed according to the theoretical formula, and compared with the measureddata seperately. And also the cases of different depths and different working thickness wereconsidered in the deep-buried iron mine.Second, to determine the basic creep parameters, engineering analogy method,experimental method, neural network were used during the theoretical analysis. In order tocontrast with the visco-elastic method, the stochastic medium theory was also used in thisarticle, by analysing creep deformation due to excavation of deep iron mine and shallowtunnel.Finally, based on the research results in this article, the influence mechanism of rock creepon vertical movements was discussed, which can give advices and take the necessary measuresfor dealing with the problem caused by vertical creep movements in engineering practice.The results of theoretical prediction and analysis indicated that the visco-elastic formulacan be used to predict creep deformation of surface subsidence caused by both deep andshallow excavation. By contrast to the method of stochastic medium theory, the viscoelasticalmethod is more suitable to calculate the creep deformation of subsidence caused byunderground excavation. In addition, methods of determining the basic parameters used in thisarticle can also provide a reference for future study of surface creep movement.