Study On Yulin-shenmu Coal Mine Areas Lead Water Fracture Zones Development Pattern

In this paper,based on yulin-shenmu coal mine areas regional geological data,married yulin-shenmu coal mine areas of coal seam and(every)aquifer space combination type.In drilling exploration,experience formula and the numerical simulation of three kinds of methods study water fractured zone height in the study area,by comparing the analysis found that calculated by empirical formula guide high measure guide and field testing has certain gap.By using empirical formula method to calculate when considering the factors of incomplete cause calculation error is bigger,empirical formula has certain limitation in yulin-shenmu coal mine areas.Numerical simulation of high conductivity results than calculated by empirical formula method is more close to the measured results,numerical simulation method is superior to the empirical formula method and the cost of short time and low cost.Borehole detection method in three methods in the most accurate,but time-consuming long and cost too much.Comprehensive analysis on the numerical simulation method is reliable and feasible and practical.The three-dimensional numerical simulation method,according to plastic condition,failure criterion and stress criterion,simulate the different aquifer space combination type and lead water fracture zones under different mining thickness and height,ums up the different(separated)aquifer space combination type with high conductivity and the relationship between the crack surface mining,different mining thick with high conductivity and the relationship between the crack surface mining.Simulated results draw guide high spatial distribution in the study area,summed up the overall high conductivity distribution,in the study area to predict water fractured zone height in the study area.By using first working bed to predict high conductivity and its overlying bedrock thickness contrast it is concluded that the coal mining water loss risk,finally for coal mining water loss danger division is divided the coal mining water loss risk,finally for coal mining water loss danger division is divided into safety(Ⅰ)and danger zone(Ⅱ)two kinds,by controlling the mining of the coal mining water loss danger zone thickness can have the effect of water coal mining.