不同路径下大理岩破裂面演化及损伤特性研究  

Study on evolution and damage characteristics of marble fracture surfaces under different ways

作　　者：丛怡 黄巍林[1] 崔宪丽[1] 孙泽宁[2] Cong Yi;Huang Weilin;Cui Xianli;Sun Zening(Qingdao Vocational and Technical College of Hotel Management,Qingdao 266199,China;Qingdao Technological University,Qingdao 266033,China)

机构地区：[1]青岛酒店管理职业技术学院,山东青岛266199 [2]青岛理工大学,山东青岛266033

出　　处：《山西建筑》2021年第24期5-8,共4页Shanxi Architecture

基　　金：国家自然科学基金(52179104);山东省自然科学基金(ZR2019BEE051,No.ZR2020ME099,No.ZR2020MD111)。

摘　　要：岩石类的脆性材料,从裂纹的分布与扩展,到材料损伤的演化规律,都可发现变形损伤的行为与特点,基于室内三轴试验结果,通过PFC 3D对岩石在不同应力路径下的变形破坏过程进行细观模拟研究,探讨了大理岩破裂面的演化过程和损伤信息,从细观角度分析了岩石的破坏机理,结果表明:加荷试验中的剪切破裂面是在试样达到峰值应力之后,应力-应变曲线进入应变软化阶段时形成的;随着围压的升高,试样内部塑性变形逐渐增大,较大的塑性变形抑制了已有孔洞和裂纹的扩张与集聚,使得试样破裂面应力集中现象在低围压条件下较高围压条件下更为明显;卸荷速率对试样破坏性质的影响不明显,同一围压下试样最终破坏面的归一化张、剪裂纹数量基本一致。The behavior and characteristics of fractal damage can be found from the distribution and expansion of cracks and the evolution law of material damage.Based on the results of indoor three axis test,the deformation and failure process of rock under different stress paths is simulated by PFC 3D,and the evolution of marble fracture surface is discussed.The results show that the shear fracture surface is formed when the stress-strain curve enters the strain softening stage after the peak stress is reached,and the plastic deformation increases gradually with the increase of confining pressure and the larger plastic deformation.It restrains the expansion and aggregation of the existing voids and cracks,and makes the stress concentration on the fracture surface more obvious under low confining pressure and high confining pressure.The effect of unloading rate on the destructive properties of the specimen is not obvious,and the normalized tensile and shear cracks on the ultimate failure surface are basically the same under the same confining pressure.

关 键 词：PFC^(3D) 破裂面 裂纹演化 卸荷速率 

分 类 号：TU411[建筑科学—岩土工程]