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NUMERICAL SIMULATION OF FLOW PATTERN OF CAVING FLOW FIELD IN THE INHOMOGENEOUS GOAF WITH ARBITRARY SHAPE

LI Zongxiang MENG Xianchen ZHAO Guochen (Vocational College, Liaoning Technical University, Fuxin 123000, China)  
To study the variations of airflow in the goaf flow field with various boundary conditions, a finite element numerical model is established to compute the flow pattern of caving goaf based on flow equation for air leakage in heterogeneous porous media. Combined with in-situ cases, the seepage flow patterns of air leakage in goafs with complicated shapes are described, and an accurate graph distribution solution of flow pattern is given. Flow pattern computation is carried out by using a modified function of stream function Laplace equation proposed by the author, and the flow fields of heterogeneous goafs with complicated shapes and along the boundary direction can meet the condition of orthogonality of flow net, and at the same time the orthogonality can be controlled by the precision of split meshes. A conclusion is drawn that the air leakage intensity of goaf along the caving uncompacted zones around solid wall boundary is relatively large, namely, the air leakage intensity of two ends of working face is large, and the flow lines can be extended to the deep parts of goaf.
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