The Study Of The Regularity Of Taixi Coal Mining Subsidence And The Effects On The Surrounding Water Conservancy Projects

The flood detention of Dongping lake is the important project of the Lower Yellow River,It is important to the Yellow River flood control. Taixi coal mine is located within a flood detention of Dongping lake.Coal mining will break the safe operation of the flood detention area and the related water conservancy project.Based on it,by Using the finite difference method to forecast the ground subsidence caused by coal mining,Design four mining boundaries,By contrast of them choose the best solution.It can guarantee the safe operation of water conservancy projects and mining the coal resources for the maximum.(1)Set up the three-dimensional numerical simulation modelAccording to the geological structure characteristics of Taixi coal mine By Rock-model software, we can established a subsidence numerical model for FLAC3D4.0.(2)Determined the rock mass mechanical parameters by back analysis methodTaking the maximum subsidence factor as the test indicator.Taking rock mass mechanical parameters as the experimental factors.Designing a four-factor and four-level testing program by means of orthogonal experiment.On the condition of ensuring the mining method unchanged, conducting a series of numerical simulation using the schemes of the parameters listed in the orthogonal table in FLAC3D4.0.Carrying out range analysis on the results and determining the change regularity of the test indicators with the experimental factors; furthermore, using analysis of variance to analyze the corresponding significance.Analyzing the results by means of range analysis and analysis of variance, and optimizing the rock mass mechanical parameters by an integrated balance method.(3) Research the rules of coal mining subsidence by numerical simulationAfter the three-dimensional numerical model and mechanical parameters were determined,design four mining boundaries, conducting a series of numerical simulation by FLAC3D4.0, obtained the surface movement law under the different solutions. (4) Evaluation the influence of mining subsidence on the surrounding water conservancy projectsOn this basis, According to the design of building,water,railways and major coal pillar and underground coal mining regulations, evaluate the influence of surface movement on surrounding water conservancy project of different mining schemes. Determine a solution that will not affect the water conservancy project, and can mining more coal.