Research and application of nonlinear elastic–hardening interfacial constitutive model in disturbed belt

Abstract

The geological structure of disturbed belt is considered as a ‘sandwich biscuit’ which contacts upper and lower interfaces and clamps weak belts in the interlayer. Based on the law of field tests, the nonlinear elastic–hardening contact constitutive model is built. By means of the FISH language of FLAC3D, which can study and judge elements automatically, the calculation parameters of shear stiffness and friction angle can be dynamically regulated. According to the field test results, K_s and φ can be regression inversion analysed using neural network. By comparing numerical analysis with the field test results, it is concluded that the model can better reflect the mechanical properties of the interface.

Keywords:

• Geotechnical mechanics
• Disturbed belt
• Nonlinear elastic
• Hardening element

This work was supported by the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, under grant no. Z110801, and the Special Funds for Major State Basic Research Project under Grant no. 2010CB732006.