摘要
桥址边坡地震稳定性评价在桥梁建设中十分重要,山区岩质桥梁桥址边坡稳定性多受结构面控制.文中依托某公路桥梁典型桥址边坡,利用有限元数值模拟技术,考虑了岩土材料应变软化特性,研究了含缓倾软弱结构面桥址边坡地震作用下安全稳定性.结果表明:考虑岩土材料应变软化的有限元数值仿真技术能较好地揭示含缓倾结构面的桥址边坡的多级潜在滑动特征.地震荷载作用加剧了坡内多级滑面的渐进发展趋势,多级滑面发育的时空顺序为:一级主滑面-二级主滑面-次级滑面,安全设计需要依据墩台部位的上下边坡地震工况下的稳定性进行.根据该桥主墩位置上下边坡地震的稳定性和变形特征,提出了针对缓倾结构面注浆加固和预应力锚索联合加固优化方案.
The seismic stability evaluation of bridge site slopes is very important in bridge construction,and the stability of rock bridge site slopes in mountainous areas is mostly controlled by structural planes.Based on a typical bridge site slope of a certain highway bridge,the finite element numerical simulation technology are used to consider the strain softening characteristics of rock and soil materials,and to study the safety and stability of the bridge site slope with gently inclined weak structural planes under earthquake action.The results indicate that the finite element numerical simulation technology considering strain softening of geotechnical materials can effectively reveal the multi-level potential sliding characteristics of bridge site slopes with gently inclined structural planes.The seismic load intensifies the gradual development trend of multi-level sliding surfaces within the slope.The spatiotemporal order of the development of multi-level sliding surfaces is that primary main sliding surface,secondary main sliding surface,and secondary sliding surface.Safety design needs to consider the stability of the upper and lower slopes at the pier and abutment under seismic conditions.Based on the seismic stability and deformation characteristics of the upper and lower slopes at the main pier position of the bridge,an optimization plan for grouting reinforcement and prestressed anchor cable joint reinforcement of gently inclined structural surfaces is proposed.
作者
汪红武
李文菊
饶颖曜
秦辉
WANG Hongwu;LI Wenju;RAO Yinyao;QIN Hui(Dabao Expressway Investment Development Co.,Ltd.,Dali 672600,China;Yunnan Communications Investment Group Investment Co.,Ltd.,Kunming 650000,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)
出处
《三峡大学学报（自然科学版）》
北大核心
2024年第1期43-48,共6页
Journal of China Three Gorges University：Natural Sciences
基金
云南省重点研发计划(202303AA080010)
国家自然科学基金项目(51779250)
云南省交通科技项目(云交科教便〔2020〕74号)。
关键词
桥址边坡
缓倾结构面
应变软化
地震
稳定性评价
加固优化
bridge site slope
gently inclined structural plane
strain softening
earthquake
stability evaluation
reinforcement optimization
