CAJ | 학술논문

针对三维离散元程序中刚度参数合理选取方法及其应用开展研究。通过理论分析，给出了结构面剪切刚度及法向刚度的理论公式；结合室内剪切试验研究和数值分析，得到了符合工程实际的剪切刚度修正Bandis经验公式及法向刚度参数经验公式，从而明确提出了一种结构面刚度参数的选取方法；通过实际工程边坡稳定性分析，探究了基于上述方法选取的参数对实际工程模拟的适用性。研究表明，岩体结构面刚度参数是应力的函数，修正Bandis经验公式能够较为完善地表征剪切破坏前结构面的剪切刚度变化规律；利用编制FISH程序使刚度参数随应力变化而改变的方法，使3DEC软件对工程岩体变形特征的模拟更加符合实际，从而验证了该方法的合理性。
침대삼유리산원정서중강도삼수합리선취방법급기응용개전연구。통과이론분석，급출료결구면전절강도급법향강도적이론공식；결합실내전절시험연구화수치분석，득도료부합공정실제적전절강도수정Bandis경험공식급법향강도삼수경험공식，종이명학제출료일충결구면강도삼수적선취방법；통과실제공정변파은정성분석，탐구료기우상술방법선취적삼수대실제공정모의적괄용성。연구표명，암체결구면강도삼수시응력적함수，수정Bandis경험공식능구교위완선지표정전절파배전결구면적전절강도변화규률；이용편제FISH정서사강도삼수수응력변화이개변적방법，사3DEC연건대공정암체변형특정적모의경가부합실제，종이험증료해방법적합이성。
A reasonable method was discussed for choosing and applying stiffness parameters in a 3D distinct element code. The formulas of pre-peak shear stiffness and normal stiffness of the fracture were derived through theoretical analysis. In combination with data from indoor shearing experiment, a corrected Bandis empirical formula of shear stiffness and a normal stiffness empirical formula were developed, which were proved to be logical by numerical analytical study. At last, a reality engineering of slope slide was discussed as a further evidence to describe the applicability of stiffness parameters chosen by the method mentioned above. It is obvious that the stiffness parameters of the fracture are a function of stress whether shear stiffness or normal stiffness. The corrected Bandis empirical formula can reflect the behavior of shear stiffness in the pre-peak range well. It is practicable to make the stiffness of the frac-ture changed with stress by developing a FISH program (in 3DEC), and therefore, the simulation can more in line with the practical engineering. In conclusion, the method mentioned above is proved to be reasonable.