Study On Water Storage Structural Feature And Storage Prediction Of Caving Rock In Shallow Goaf

With the development of coal field in the arid and semi arid area of Western China,the problem of water shortage is becoming more and more obvious.In order to promote the harmonious development of coal mining and the protection of water resources,the water storage technical scheme of caving rock in goaf is put forward.But the pressure caused by overlying strata on caving rock has spatial variation because of structure differences of overlying strata in different locations,the distribution of water storage structure of caving rock is uneven,it brings great difficulty to the water storage prediction of caving rock in goaf.Therefore,based on the engineering background of 22616 working face in Shendong Coal Mine,the similar experiment,numerical calculation,field measurement,theoretical analysis and engineering application are adopted to study the characteristics of water storage structure and water storage prediction in shallow goaf.Aiming at the specific mining condition in Shendong Coal Mine,the water storage background of caving rock in the goaf is systematically studied,preliminary discussion on the water storage technology system is carried out and the characteristics of water storage technology of caving rock in goaf is reveled further.The experimental is carried out to study the parameters of water storage structure in shallow goaf,chromatogram scan is used to study mineral composition and microstructure,water absorption and mechanical parameters are measured,according to the deformation characteristics of caving rock to determine the relationship between stress and bulking factor,to provide basic data for the water storage prediction of caving rock in the goaf.The structure characteristics of shallow coal mine are studied theoretically based on the calculation results of experiment and numerical analysis,mechanical structure of the goaf is constructed in strike and dip,and the stress zone of caving rock in goaf is divided,the PU's equilibrium arch theory,sand column method and classical mechanics theory of upper roof hinge structure are used to analyze the stress changes of caving rock,the mathematical model is established and it is verified by measured data.Combined with the relationship between stress and bulking factor,the expansion characteristic zones of the caving rock are divided corresponding to the stress zones,the distribution rules of water storage characteristic in goaf are analyzed,to establish the space distribution model of caving rock and verify its rationality.Taking full account of the water absorption characteristics of caving rock,the prediction method of water storage of caving rock in the goaf is put forward,and the water storage prediction model of caving rock in the goaf is established,and the computer programming language is used for programming.The prediction model of water storage is used to calculate the water content of caving rock in the goaf of 22616 working face,the independent development measuring device of water storage coefficient of caving rock is used to verify the results.At the same time,the estimated water content by rock movement method in the field is also used to verify the model rationality.Finally,to establish the sound prediction method of water storage of caving rock in the shallow coal mine.The water storage technology of caving rock establishes a new way for the coordinated development of coal mining and the protection of water resources in the water shortage coal mine in northwest china and the green mining realized.At the same time,the accurate prediction of water storage also provides an important guarantee for the safety and operation of water storage project.