Comprehensive Research On The Simulation Of Mine Water Inrush Spreading Process And Its Application

China’s energy structure characteristics determine that coal resources will be important basic energy in China for a long time.The safety of coal mine production is directly related to the sustainable development of the national economy and the safety of people’s lives.Due to the complex hydrogeological and geological structural conditions in China,the problem of mine water disaster has become one of the main threats affecting the safe mining of coal mines.With the increasingly complex water disaster,the simulation of the water inrush spread process has become an important content to control and reduce the water disaster.Therefore,this These uses physical and numerical simulation technology to comprehensively study the flow mechanism of water flow in complex mine excavation space to solve the flow problem in the process of mine water inrush spread.This study can more accurately reflect the evolution process of underground flood and mine inundation,and provide scientific and technical support for the rational formulation of flood emergency rescue plans,rescue plans,and mine recovery pumping and drainage plan.The main research contents and results are as follows:(1)The characteristics of the mine water inrush and the control factors of spread are analyzed and summarized,which provides a basis for the setting of simulated inflow conditions and the analysis of inundation law in the process of spread.According to the analysis of water filling conditions and historical water inrush conditions,the distribution characteristics of water inrush points are summarized.It is pointed out that the high frequency of water disasters is in the spatial mining face,the heading,the roadway exposing the fault,the mining influence area,and the area with high risk in the risk assessment.In addition,this These analyzes the evolution characteristics of the water inrush of the two most common types of water disasters and shows that the water inrush of Ordovician limestone karst type water disasters in the floor has the characteristics of first increasing to the peak value,then maintaining stability or attenuation,and then maintaining stability.The water inrush of permeable water disasters in the old air has the characteristics of first rapid increase and then attenuation to zero.From the characteristics of water flow movement and water inrush conditions,the control factors of mine spread are analyzed.It is proposed that the mine structure,water inrush location,water inrush,and its duration are the direct factors causing mine inundation.The three factors affect the scope,time,scope,direction,and sequence of mine inundation to varying degrees.(2)Based on the similarity theory,the physical simulation test on the process of water inrush and spread in the mine roadway is carried out,and the variation law of the mine water level and the characteristics of the flow pattern are revealed.The physical simulation theory,test design,test conditions,and test steps are discussed in detail.And,the test results of water level monitoring and flow regime observation are analyzed.It is found that the change in water level has a positive correlation with the water inrush flow for the downstream flow,and both have the same change trend.For the rising water flow,the water level first increases rapidly and then changes slowly with the water inrush.The rising water level is related to the mine roadway structure and is less affected by the water inrush flow.The sudden change in tunnel structure is the direct cause of complex flow patterns.At the positions of a slope change,bifurcation,and bending of the tunnel,the flow direction or water flow section changes,resulting in hydraulic phenomena such as hydraulic jump,water drop,reflection,and reflux area,resulting in intensified turbulence and significant local head loss.(3)A numerical simulation method for the process of water inrush and spread in mining space is proposed.Firstly,the spatial structure of the mine is analyzed and modeled parametrically,with traverse points,mining engineering plan,and roadway section as the basic data.Consider the mine roadway network,drainage,and water separation facilities and goaf.Through entity abstraction,gob generalization,topology analysis,and attribute assignment,the mining space are generalized into a directed network graph composed of nodes and segments,and the construction of the mining space model is realized.At the same time,according to the advanced progress of the mining face,an automatic mining updating algorithm based on the topology of the mining spatial model is established.Then,based on the basic principle of hydrodynamics,the model of water inrush spread in mining space is constructed.On the generalized roadway network,the open and full flow model of the mine roadway network is established based on the open flow and pipe flow theory,and the calculation error of the complex flow pattern is corrected by adding the local head loss term to the motion equation.In the generalized pump section and water retaining section,the drainage and water retaining models are established respectively according to the flow capacity to reveal the control effect of drainage and water separation facilities on the spread of water inrush.Based on the nonDarcy seepage theory,the flow model of the goaf is established in the generalized goaf section to reveal the ponding process in the goaf.The three models are coupled to form a water inrush propagation model in mining space,which can accurately reveal the flow law of water inrush under any water disaster.Finally,an adaptive space numerical solution method is proposed for the constructed spread model.Based on the finite-difference numerical solution,the method automatically adjusts the mine zoning involved in the calculation at each time step according to the mine structure and the water inrush spread range,ensuring that only the mine area covered by the spread is involved in the calculation,optimizing the calculation space and improving the calculation efficiency.(4)The reliability of the numerical model of water inrush spread in mining space is quantitatively evaluated,and the sensitivity of the model parameters is evaluated by using the modified Morris screening method.The physical model test is used to verify the open and full flow model of the mine roadway network.The monitored and simulated waterlevel values are compared,and the simulation effect is evaluated by introducing the Nash efficiency coefficient.The results show that the numerical simulation results are wellmatched with the test results,and the open and full flow model of the mine roadway has good accuracy and efficiency.In order to verify the reliability of the calculation results of the established spread model under the coupling of roadway and goaf,CFD simulation technology is adopted based on RNG K-ε The turbulence model,VOF multiphase flow model,and porous media model establish the tunnel goaf coupling flow,model.The simulation results are compared with the equivalent roughness coefficient pipe flow model in the goaf and the spread model proposed in this These.The results show that the calculation results of the spread model established in this These are in good agreement with the CFD simulation results,and can well deal with the tunnel goaf coupling flow.Based on the idea of disturbance analysis,the modified Morris screening method is used to evaluate the sensitivity of the model geometric parameters and hydraulic simulation parameters.The results show that the roadway length,section width,and energy loss coefficient have a great impact on the simulation results,and the energy loss coefficient has the greatest uncertainty.In this These,according to Bernoulli’s energy equation,the expression of the energy loss coefficient at the sudden change,bending,and bifurcation position of the roadway section is given.Especially at the bifurcation position,the energy loss coefficient equation on the branch roadway considering bifurcation angle,slope,overflow section,flow,and position head is established,and the automatic correction of this parameter is realized.(5)The proposed simulation method is applied to Wutongzhuang coal mine,and the spatial model of Wutongzhuang coal mine is constructed to simulate and predict the mine inundation process under different water inrush conditions.Through the setting of characteristic cases,the influence of mine structure,water inrush location,water inrush,and its duration on the evolution process of water disaster is quantitatively analyzed,and the law of mine water inrush inundation is summarized.The analysis results show that the inundation range of different water inrush locations in the same mine structure partition is basically the same under the same cumulative water inrush and drainage.Using the scenario analysis method,the possible water inrush scenarios are given qualitatively,and combined with quantitative simulation technology,the inundation risk of different mining areas in Wutongzhuang coal mine is predicted.Finally,taking the water inrush scenario in the third mining area as an example,the control of the water disaster process and the mine recovery drainage after flooding are simulated by setting up closed walls and pumps.The simulation results show that the simulation method proposed in this These can be applied to the water disaster control and mine recovery management.