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Impact Analysis of Situ Stress on Borehole Strain Coupling Coefficients
Pages: 419-425+489
Year: Issue:  3
Journal: Journal of Seismological Research

Keyword:  situ stressborehole straincoupling coefficientdrilling modelstress field;
Abstract: Using the established four layer medium coupled drilling model,we calculated the effect of elastic parameters variation of borehole coupling medium on coupling coefficients of borehole strain by stress function method.The calculation results show that the effect of equivalent elastic modulus change on the coupling coefficients of the plane strain is larger than that of the shear strain in the borehole coupling medium.Comparing with the observed data,the observation value of the coupling coefficients of the plane strain exhibits a significant heterogeneity,as well as its value may relate to the background stress field of the station.
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