CAJ | 학술논문

为研究加筋土界面作用的力学响应，对离散元程序（ PFC3D）进行二次开发，建立了土工格栅拉拔试验仿真模型。与室内模型试验结果进行对比，探讨了拉拔界面细观参数的演变及荷载传递机理，揭示了细观参数的演化规律及其与宏观力学性质之间的关系。研究结果表明：筋土界面区域成为主要的位移集中区，上界面影响厚度略大于下界面影响厚度；在筋土界面区域形成了高度的X向应力集中，沿格栅长度方向出现若干个Z向应力集中区，表明格栅横肋挤压土体，其所提供的被动承载力较为显著；在筋土界面区域，局部孔隙率随拉拔位移增大而增大，接触数减少，滑动比随拉拔位移的增加发生了激烈的跌宕起伏，界面局部位置发生剪胀，宏观上对应拉拔阻力增大，而后孔隙率慢慢减小，拉拔阻力回落。
위연구가근토계면작용적역학향응，대리산원정서（ PFC3D）진행이차개발，건립료토공격책랍발시험방진모형。여실내모형시험결과진행대비，탐토료랍발계면세관삼수적연변급하재전체궤리，게시료세관삼수적연화규률급기여굉관역학성질지간적관계。연구결과표명：근토계면구역성위주요적위이집중구，상계면영향후도략대우하계면영향후도；재근토계면구역형성료고도적X향응력집중，연격책장도방향출현약간개Z향응력집중구，표명격책횡륵제압토체，기소제공적피동승재력교위현저；재근토계면구역，국부공극솔수랍발위이증대이증대，접촉수감소，활동비수랍발위이적증가발생료격렬적질탕기복，계면국부위치발생전창，굉관상대응랍발조력증대，이후공극솔만만감소，랍발조력회락。
Through the secondary development of discrete element method particle flow code 3 dimensions ( PFC3D) , the geosynthetics pullout test 3D numerical simulation model was established for researching the me-chanical response of the reinforced soil interface effect. The evolution of the mesoscopic parameters and load-trans-mitting of the reinforced soil interface region were studied through comparing the macroscopic mechanical properties with the laboratory model test results. The results show that the reinforced soil interface region has become the main displacement concentration area, and the upper interface thickness is slightly larger than the lower interface thick-ness. The stress concentration zones of the X direction in the reinforced soil interface region took shape, and several stress concentration zones in the Z direction appeared along the geogrid length direction, which demonstrates that the geogrid transverse ribs have extruded soil, and passive resistance of the transverse rib is significant. In the rein-forced soil interface region, with the pullout displacement increasing, the local porosity increases and the coordina-tion number decreases, the sliding fraction undergoes significant ups and downs, and the local location of the inter-face appears with shear dilatancy. The corresponding pullout resistance increases, then the porosity slowly decreases and the pullout resistance falls back in the macroscopic view.