双排微型抗滑桩的抗滑效果
来源期刊：中南大学学报(自然科学版)2013年第4期
论文作者：傅强 孙飞飞 唐承铁 胡毅夫
文章页码：1596 - 1602
关键词：滑坡；双排微型抗滑桩；监测；有限元分析
Key words：landslides; double-row anti-slide micropiles; monitor; finite element analysis
摘 要：考虑到高速公路边坡的安全性，为了掌握潜在滑移体的滑动趋势，评价双排微型抗滑桩的安全性，验证理论计算方法的合理性，对通平高速公路某边坡实施双排微型抗滑桩施工，并且对加固边坡进行坡体位移、桩顶位移和桩侧压力监测。此边坡为普遍存在的含有软弱夹层的强风化岩石边坡。通过监测结果发现潜在滑移体和固定坡体没有明显位移差，桩顶位移略小，且变化速度明显减小。在有限元力学分析的基础上，对比发现在承受相同下滑力时，双排微型抗滑桩桩顶位移较普通悬臂桩减少27.88%。在理论分析的基础上阐述边坡加固后的动态稳定性，得出双排微型抗滑桩前后桩的受力比例、受力分布等情况，比普通抗滑桩加固效果更好，桩顶和坡顶位移更小，为以后此类边坡和双排微型抗滑桩的应用设计提供一定的帮助。
Abstract: In order to understand the potential sliding trend of the sliding body, the safety of such anti-slide micropiles was evaluated, the theoretical calculation method was evaluated and the safety of side slope of the expressway and the slope body position shift was considered. The double-row anti-slide micropiles were built on to a certain side slope of Tongping expressway and pile top displacement and pile side pressure were monitored to the reinforced slope. No obvious displacements of the potential sliding body and fixed slope were found in the monitored results, and the pile top displacement was on the small side and the rate greatly decreased. Based on the finite element mechanics analysis, the pile top displacement was reduced by 27.88%, under the same sliding power, compared with the ordinary cantilever pile. The dynamic stability of reinforced side slope was elaborated on the basis of theoretical analysis. The double-row anti-slide micropiles’ stress ratio and stress distribution were obtained, which were better than the general anti-slide pile reinforcement. The research can offer help to the application of double-row anti-slide micropiles to the similar side slopes.
傅强1，孙飞飞2，唐承铁1，胡毅夫2
(1. 中南大学 地球科学与信息物理学院，湖南 长沙，410083；2. 中南大学 资源与安全工程学院，湖南 长沙，410083)
摘 要：考虑到高速公路边坡的安全性，为了掌握潜在滑移体的滑动趋势，评价双排微型抗滑桩的安全性，验证理论计算方法的合理性，对通平高速公路某边坡实施双排微型抗滑桩施工，并且对加固边坡进行坡体位移、桩顶位移和桩侧压力监测。此边坡为普遍存在的含有软弱夹层的强风化岩石边坡。通过监测结果发现潜在滑移体和固定坡体没有明显位移差，桩顶位移略小，且变化速度明显减小。在有限元力学分析的基础上，对比发现在承受相同下滑力时，双排微型抗滑桩桩顶位移较普通悬臂桩减少27.88%。在理论分析的基础上阐述边坡加固后的动态稳定性，得出双排微型抗滑桩前后桩的受力比例、受力分布等情况，比普通抗滑桩加固效果更好，桩顶和坡顶位移更小，为以后此类边坡和双排微型抗滑桩的应用设计提供一定的帮助。
关键词：滑坡；双排微型抗滑桩；监测；有限元分析
FU Qiang1, SUN Feifei2, TANG Chengtie1, HU Yifu2
(1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;2. School of Resources and Safety Engineering, Central South University, Changsha 410083, China)
Abstract:In order to understand the potential sliding trend of the sliding body, the safety of such anti-slide micropiles was evaluated, the theoretical calculation method was evaluated and the safety of side slope of the expressway and the slope body position shift was considered. The double-row anti-slide micropiles were built on to a certain side slope of Tongping expressway and pile top displacement and pile side pressure were monitored to the reinforced slope. No obvious displacements of the potential sliding body and fixed slope were found in the monitored results, and the pile top displacement was on the small side and the rate greatly decreased. Based on the finite element mechanics analysis, the pile top displacement was reduced by 27.88%, under the same sliding power, compared with the ordinary cantilever pile. The dynamic stability of reinforced side slope was elaborated on the basis of theoretical analysis. The double-row anti-slide micropiles’ stress ratio and stress distribution were obtained, which were better than the general anti-slide pile reinforcement. The research can offer help to the application of double-row anti-slide micropiles to the similar side slopes.
Key words:landslides; double-row anti-slide micropiles; monitor; finite element analysis
