A constitutive model considering friction property of geomaterials and stability analysis of borehole

摘要: Abstract The strength and deformation properties of geomaterials are essential to estimating the cracking behavior rock, especially for deep exploration conventional unconventional hydrocarbon resources. Because encountered in generally granular friction materials formed from deposition or cementation natural conditions, they sustain loads by means intergranular friction, which forms main source their shear strength. Therefore, failure material is governed law. A mechanical element modelled based on concept that internal exists both elastic state plastic state. By assuming coefficient proportional strain, stress computed, then corresponding nonlinear elasto-plastic constitutive model established. Based analysis effect rock during macroscopic deformation, mechanism geomaterials' enhancement explained. was used compute fracture a tunnel borehole. results show effective response important geotechnical problems, such as cracked rock-mass strength, forecasting crack closure, borehole wall collapse.