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| SHEARING STRENGTH AND ELASTO-PLASTIC FEM ANALYSES FOR DUAL POROSITY MEDIA |
| ZHANG Yujun1，ZHANG Weiqing2 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. China Railway Tunnel Survey and Design Institute Co.，Ltd.，Tianjin 300133，China) |
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Abstract Considering the connectivity rate and spacing of fractures，volume fractions of pore matrix and fracture material in a representative element volume，a method of determining the cohesion and internal friction angle which vary with direction in a dual porosity medium was suggested，and the equations established for calculating the values of and were proved to be reasonable. Introducing the method solving and values into the elasto-plastic finite element method(FEM) code，the computations were carried out for a change obviously，the plastic zones accelerate development，and the distributions of displacements，stresses and plastic zones change from symmetric ones to asymmetric ones，as well as the anisotropy of surrounding rock mass displays more significantly；but with the increase of fracture spacing，the dynamic state of surrounding is just the reverse of what in the case of increasing fracture connectivity rate.
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2015, Vol. 34 
