Previously, the researches on the mechanical properties of mudstone mainly focus on the situation of relatively small strain rate, which are appropriate for shallow formation borehole deformation; however, the deep mudstone borehole failure is highly nonlinear. The true triaxial borehole nonlinear deformation mechanical test system was developed for deficiency of laboratory test equipment simulation of borehole nonlinear deformation under real stress state, borehole deformation experiments have been carried out under different stress states to get stress-strain curves of borehole deformation. According to these borehole wall stressstrain curves, the theoretical results and experimental results were compared by using constitutive model of mudstone based on large deformation theory, and the results showed well fitting. Experimental study and establishment of mudstone constitutive relation have some significance for the control theory of mudstone borehole nonlinear damage.
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