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为精确执行非线性Hoek-Brown(HB)强度折减,首先在p-q空间分析了HB曲线任意点切线与Mohr-Coulomb(MC)准则的对应关系,推求了HB屈服函数材料折减系数和强度折减系数的关系,提出了潜入强度折减系数的HB弹塑性分析模型,介绍了在Flac3D平台上二次开发实现非线性HB强度折减的基本思路。对一边坡算例用本文方法和简化Bishop法进行了对比分析,计算结果表明,潜入强度折减系数的HB弹塑性模型计算获得的边坡潜在滑动面形态、位置和相应的安全系数,与简化Bishop法计算结果很接近。
In order to accurately perform the nonlinear Hoek-Brown (HB) strength reduction, the corresponding relationship between the tangent of arbitrary point of the HB curve and the Mohr-Coulomb (MC) criterion is first analyzed in pq space, and the yield reduction coefficient and the strength of the HB yield function Deduced the HB elasto-plasticity analysis model of sneaking strength reduction coefficient, and introduced the basic idea of secondary development on the Flac3D platform to realize the nonlinear HB intensity reduction. The comparison between a slope example and the simplified Bishop method is carried out. The calculation results show that the potential sliding surface shape, position and corresponding safety factor obtained by the HB elasto-plastic model of infiltration strength reduction coefficient are compared with simplified Bishop method calculation results are very close.