A rounding approach the singular surface of Hoek-Brown criterion and its strength reduction technique
YOU Tao1，DAI Zihang1，LU Caijin2，SHEN Qiwei3
(1. School of Civil Engineering，Fuzhou University，Fuzhou，Fujian 350108，China；2. Fujian Communications Planning and
Design Institute，Fuzhou，Fujian 350004，China；3. China Railway 18 Bureau Group Co.，Ltd.，Tianjing 300222，China)
Abstract：To overcome the numerical singularity of the yield surface based on the Hoek-Brown strength criterion， a new approach was presented to smooth the edges of the yield surface. The ideal elasto-plastic constitutive model was implemented in ABAQUS software with the fully implicit backward Euler integral algorithm employed in the stress updating. The strength reduction method in finite element method based on the Hoek-Brown criterion was implemented with the smoothed yield function. The similarities and differences of the strength reduction techniques applied with the Mohr-Coulomb strength criterion and the Hoek-Brown nonlinear strength criterion were discussed. The modeling on a circular tunnel shows that the numerical results of stresses and plastic zones in the surrounding rock agree well with the analytical results. The modeling on a rock slope shows that in comparison with the linear strength reduction technique of the equivalent Mohr-Coulomb model，the nonlinear strength reduction technique based on the Hoek-Brown model produced the slip surface which agree better with the characteristics of the slip surface of a rock slope，which are shallower in location and steeper in shape.
尤 涛1，戴自航1，卢才金2，沈启炜3. Hoek-Brown准则奇异屈服面的圆化方法及其强度折减技术与应用[J]. 岩石力学与工程学报, 2017, 36(7): 1659-1669.
YOU Tao1，DAI Zihang1，LU Caijin2，SHEN Qiwei3. A rounding approach the singular surface of Hoek-Brown criterion and its strength reduction technique. , 2017, 36(7): 1659-1669.
2017, Vol. 36 
