摘要
为了对泸定大渡河悬索桥隧道式锚碇边坡的稳定性进行深入分析,基于坡体结构特征并考虑施工过程,采用FLAC3D数值模拟软件对该边坡在主缆超张拉、暴雨、地震等不同工况下的坡体变形及潜在失稳模式进行了三维模拟分析。结果表明:静力条件下不同缆力对隧道锚边坡浅表层的变形及其失稳破坏模式几乎没有影响,不同缆力作用下浅表层安全系数为1.45;随着缆力的增大,锚碇周围深部岩体安全系数逐渐变小(3.75→3.55→3.2→2.9),且深部岩体潜在滑面与缆力作用线的夹角逐渐变小;除了在地震工况下坡体表面稳定性较差之外,其他工况边坡稳定性、隧道及隧道锚稳定性均较好;隧道、隧道锚及桩基承台的施工对边坡稳定性影响较小,边坡支挡结构的施作有效提高了边坡稳定性。
In order to analysis the stability of tunnel anchorage slope for suspension bridge across Dadu River in Luding County.3 D simulation analysis was carried out for slope deformation and the potential failure mode under the conditions of super tension,rainstorm,earthquake and others using the numerical simulation software FLAC3 D based on the characteristics of the slope structure and considering the construction process.The results show that： under the static condition,the different cable forces have little effect on the deformation and failure mode of the shallow subsurface of the tunnel-anchorage slope with the same safety factor（1.45）.The safety factor of deep rock mass around anchorage becomes smaller gradually（3.75→3.55→3.2→2.9） with the increase of cable force,and the angle between the potential sliding surface and line of cable force becomes smaller.Except the shallow subsurface in the slope under seismic condition,the tunnel-anchorage slope under all other conditions is stable.The construction of tunnel,tunnel-anchorage and pile cap has little influence on stability of the slope,indicating that the layout of supporting structure can improve the stability of natural slope effectively.
出处
《地下空间与工程学报》
CSCD
北大核心
2017年第6期1661-1670,共10页
Chinese Journal of Underground Space and Engineering
基金
四川省交通运输科技项目(2013 A1-3
2014-C-1)
教育部新世纪优秀人才支持计划资助项目(NCET-13-0976)
关键词
隧道式锚碇
边坡稳定性
数值模拟
失稳模式
tunnel anchorage
slope stability
numerical simulation
failure mode
