Research The Law Of Surface Movement And Deformation Of Multiple Mining Under Confined Water Loss And Thick Unconsolidated Layers

The surface will produce deformation and movement when it is affected by coal mining. If mining the adjacent layers of old goaf again, rock and surface are once again suffering from disturbance, This phenomenon is called repeated mining.As the coal mining technology improved, according to the need of repeated mining development and production of coal, repeated mining research has attracted greater attention from scholars and experts. This thesis in the light of the mining working face measured data, combined with the related theoretical analysis and based on the observation data of each period that can draw all kinds of deformation curves and Coal mining face corresponding curves. This will allow us to analyse the data more accurately and intuitive. Through analysis and study on ground movement and deformation of the important parameters that can find out in similar geological and mining conditions of repeated mining caused some rule of ground movement and deformation.In addition, through independent design and production of the simulation model which we can conduct simulation test of unconsolidated formation confined water dehydration. Experiments show that unconsolidated formation aquifer in the overlying the total stress invariant> under drainage conditions the land concretion deformation rule and creep characteristics and coal mining caused aquifer drawdown, thus causing mechanism and evolutionary law of land concretion. By combining theoretical analysis reveals unconsolidated formation confined water dehydration for mining under thick soil layer surface subsidence coefficient is greater than the effect mechanism of one.In order to study the bedrock, loose strata movement and deformation which are caused by the repeated mining and by using the method of similar material simulation test, it can effectively reflects the rock and unconsolidated formation deformation rule under the influence of the coal mining that can make up for the inadequacy of the scene cannot be observed. Simultaneously, turning the observational data into graphs plotted that can clearly see dynamic movement deformation law of stratum in the process of exploitation.