Numerical simulation study on stress-displacement evolution law during ground filling drilling process
In order to obtain the stress-displacement distribution and evolution law of surrounding rock during ground filling drilling process,explore the mechanical mechanism of deformation and failure in ground drilling,and provide theoretical support for drilling structure design.Taking the construction of typical mine ground filling boreholes as the research object,numerical simulation of the drilling process was carried out using FLAC3D,with a focus on analyzing the stress displacement evolution law of the surrounding rock of the borehole when drilling to 50 m,250 m,and 500 m.The research results indicate that the stress-displacement distribution of the borehole surrounding rock is the direct cause of its deformation and failure.The vertical stress and horizontal stress increase linearly with the increase of drilling depth.The maximum vertical displacement is located at the top of the borehole,and the growth trend slows down significantly after drilling to a certain depth,showing a non-linear increasing trend.The asynchronous vertical displacement will cause the borehole to produce delamina-tion.The horizontal displacement increases linearly with the depth of the borehole,with its peak loca-ted in the surrounding rock at the bottom of the borehole.Horizontal displacement is the direct cause of shear failure and necking in drilling.The research results can provide theoretical guidance for the design optimization and construction of ground filling,grouting,and gas drilling.
drilling constructionnumerical simulationvertical displacementhorizontal stressevoluti-on law
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