Geotechnical stability analyses based on classical continuum may lead to remarkable underestimations on geotechnical safety. To attain better estimations on geotechnical stability, the micro-polar continuum is employed so that its internal characteristic length (4) can be utilized to model the shear band width. Based on two soil slope examples, the role of internal characteristic length in modeling the shear band width of geomaterial is investigated by the second-order cone programming optimized micro-polar continuum finite element method. It is recognized that the underestimation on factor of safety (FOS) calculated from the classical continuum tends to be more pronounced with the increase of 4. When the micro-polar continuum is applied, the shear band dominated by 4 is almost kept unaffected as long as the adopted meshes are fine enough, but it does not generally present a slip surface like in the cases from the classical continuum, indicating that the micro-polar continuum is capable of capturing the non-local geotechnical failure characteristic. Due to the coupling effects of 4 and strain softening, softening behavior of geomaterial tends to be postponed. Additionally, the bearing capacity of a geotechnical system may be significantly underestimated, if the effects of 4 are not modeled or considered in numerical analyses.

基于经典连续体的岩土工程稳定性分析可能会导致对岩土工程安全性的低估。为了获得对岩土工程稳定性的更好估计，采用了微极性连续体，以便可以利用其内部特征长度（4）来模拟剪切带宽度。基于两个土质边坡实例，利用二阶锥规划优化的微极性连续介质有限元方法，研究了内部特征长度在模拟土工材料剪切带宽度中的作用。公认的是，经典连续体计算得出的安全系数低估随着4的增加而更加明显。当应用微极性连续体时，由4为主的剪切带几乎保持不变。因为采用的网格已经足够好了，但是它通常不像传统连续体那样具有滑移表面，这表明微极连续体能够捕获非局部岩土破坏特征。由于4和应变软化的耦合作用，土工材料的软化行为趋于被推迟。此外，如果未在数值分析中对4的影响进行建模或考虑，则岩土工程系统的承载力可能会大大低估。