基于Sheorey岩体强度准则对等效Mohr-Coulomb强度参数的推导

Estimating Equivalent Mohr-Coulomb Strength Parameters Based on the Sheorey Rock Mass Strength Criterion

引入基于RMR岩体分级指标的Sheorey岩体强度准则,根据σ1-σ3平面上用线性Mohr-Coulomb(M-C)强度准则对非线性准则进行拟合的原则,利用最小二乘法推导出相应的等效M-C强度参数,并给出等效强度参数的通用表达式,方便利用Sheorey准则评价岩体的强度及稳定性。之后,通过一个算例比较了Sheorey准则与HoekBrown准则的M-C等效强度参数。分析结果表明,两准则的等效强度参数具有良好的吻合度。

According to the principle of fitting non-linear strength criterion with linear M-C criterion in σ1-σ3 plane,we derived the equivalent M-C strength parameters of the Sheorey strength criterion which is based on the RMR system by use of the least square method.We also present the general formulas of the equivalent M-C strength parameters to be used in the evaluation of strength and stability of rock mass.A calculation example is given to compare the M-C strength parameters between Sheorey criterion and Hoek-Brown criterion.Results reveal that the strength parameters of both criteria are well consistent.