CAJ | 학술논문

针对目前节理岩体损伤本构模型中仅考虑节理等宏观缺陷造成的损伤，而没有考虑岩块中微裂纹等微观损伤的不足，提出了综合考虑宏微观损伤的节理岩体本构模型。其中微观损伤模型采用基于应变强度理论和岩石微元强度服从Weibull分布假定的统计损伤模型，把其应用于被节理切割而成的岩块。而宏观损伤模型主要基于连续介质力学原理，把节理对岩体性质的劣化作为损伤来考虑。在考虑节理传压及传剪系数的基础上，提出了综合考虑宏微观复合损伤的节理岩体本构模型。算例表明宏观节理的存在大大削弱了岩体的强度，降低了其刚度，增大了其柔性。所提出的模型能够较好地反映宏微观两类损伤对岩体应力-应变关系及强度的影响，较为合理。
침대목전절리암체손상본구모형중부고필절리등굉관결함조성적손상，이몰유고필암괴중미렬문등미관손상적불족，제출료종합고필굉미관손상적절리암체본구모형。기중미관손상모형채용기우응변강도이론화암석미원강도복종Weibull분포가정적통계손상모형，파기응용우피절리절할이성적암괴。이굉관손상모형주요기우련속개질역학원리，파절리대암체성질적열화작위손상래고필。재고필절리전압급전전계수적기출상，제출료종합고필굉미관복합손상적절리암체본구모형。산례표명굉관절리적존재대대삭약료암체적강도，강저료기강도，증대료기유성。소제출적모형능구교호지반영굉미관량류손상대암체응력-응변관계급강도적영향，교위합리。
The current study on damage constitutive model of jointed rock mass considers only the macroscopic damage caused by defects such as joints without considering the microscopic damage caused by defects such as micro-crack in rock blocks. Aiming at the above-mentioned shortage, the jointed rock mass constitutive model combining macroscopic and microscopic damage is proposed. The microscopic damage model is a statistical dam-age based on strain strength theory and the strength characteristics of rock micro-unit with Weibull distribution, which is used in rock blocks cut by joints. While the macroscopic damage model is mainly based on continuous media mechanics principle, deterioration of rock mass property caused by joints is regarded as damage. On the basis of considering compression and shear transfer coefficient of the joint, the constitutive model of jointed rock mass by combining macroscopic and microscopic composite damage is proposed. The calculation example indi-cates that existence of the joint greatly weakens the strength of rock mass, reduces its stiffness and enlarges its flexibility. So, the proposed constitutive model can reflect the effect of macroscopic and microscopic damage on rock mass stress-strain relationship and strength, which is rational.