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Hoek-Brown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。
Abstract
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.
关键词
岩石力学 /
Sheorey强度准则 /
Mohr-Coulomb强度准则 /
最小二乘法 /
等效强度参数
Key words
rock mechanics /
Sheorey strength criterion /
Mohr-Coulomb criterion /
least square method /
equivalent strength parameters
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