Study on Fracture Propagation Law of Fracking Top Cutting and Pressure Relief
In order to solve the problem that hard roof is difficult to collapse and fall,this paper uses numerical simulation to study the parameters of fracking.First,the pore pressure at the injection point and the height and width of fracture growth under different stresses are analyzed.It is found that the pore pressure at the injection point increases step by step with time,and the peak pore pressure at the injection point decreases gradually with the increase of stress difference.The crack width and crack height show an opposite trend,with an increase in stress difference,an increase in crack width,and a decrease in crack height.Finally,the elastic modulus is analyzed on the crack propagation form,and it is found that the elastic modulus increases,the crack width gradually decreases,and the crack height gradually increases,which provides a certain reference for the design of fracking top cutting and pressure relief scheme for hard roof.
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