下穿隧道施工对高边坡抗滑桩内力影响研究  

Influence of Tunnel Construction Under High Slope on the Internal Force of Anti-slide Pile

作　　者：肖洪波 付雄 杨果林[2] 徐明煌 刘冬东 邱明明 XIAO Hongbo;FU Xiong;YANG Guolin;XU Minghuang;LIU Dongdong;QIU Mingming(CCFED Civil Engineering Co.,Ltd.,Changsha,Hunan 410004,China;School of Civil Engineering,Central South University,Changsha,Hunan 410075,China;College of Civil Engineering and Architecture,Yan’an University,Yan’an,Shaanxi 716000,China)

机构地区：[1]中建五局土木工程有限公司,湖南长沙410004 [2]中南大学土木工程学院,湖南长沙410075 [3]延安大学建筑工程学院,陕西延安716000

出　　处：《施工技术（中英文）》2023年第12期1-8,共8页Construction Technology

基　　金：中建五局土木工程有限公司科技开发计划项目:复杂地形条件下大跨偏压公-轨隧道群建造关键技术研究;国家自然科学基金:多级边坡格构式锚杆支护结构的抗震分析理论与设计方法(51878667)。

摘　　要：依托长沙市夏鹃路下穿智慧公园隧道工程深挖路堑段,基于现场情况设计了边坡段支护结构抗滑桩现场监测试验方案并开展了为期1年的现场监测,对其监测结果进行分析得出以下结论:高边坡下穿隧道施工会对坡脚抗滑桩的内力和围岩状态产生较大影响,尤其当隧道掌子面距桩2倍洞径到过桩2倍洞径时影响最大;高边坡下穿隧道施工时,桩侧土压力作用点产生上移再下移的变化,导致抗滑桩受弯先增大后减小;抗滑桩背坡侧进行明洞施工时,明洞施工产生的外力可使抗滑桩受弯程度减小,间接提高了抗滑桩的抗弯能力冗余度;桩侧土压力大小和分布会随着其上土体沉积和旁边隧道施工而产生较大变化,进而引起桩身内力变化;当抗滑桩两侧都有隧道施工时,应两侧都布置土压力监测点,以得到更完整的土压力分布数据,进行更准确分析。Based on the deep cutting section of Xiajuan Road underneath passing Smart Park Tunnel project in Changsha City,a field monitoring test plan was designed for the anti-slide pile of the support structure in the slope section based on the site conditions in this project and a one-year field monitoring was carried out.The monitoring results were analyzed and the following conclusions are drawn:The construction of high slope underpass tunnel will have a great impact on the internal force and surrounding rock state of the anti-slide pile at the slope toe,especially when the tunnel face is 2 times the diameter of the pile to 2 times the diameter of the passing pile,the impact is greatest;During the construction of tunnel under high slope,the soil pressure at the pile side will move up and then down as a whole,resulting in the bending of anti-slide pile first increasing and then decreasing;When the open-cut tunnel is constructed on the backslope side of the anti-slide pile,the external force generated by the open-cut tunnel construction can reduce the bending degree of the anti-slide pile,which indirectly improves the capacity of the anti-slide pile;The magnitude and distribution of the soil pressure on the pile side will change greatly with the soil deposition on it and the construction of the adjacent tunnel,which will cause the change of the internal force of the pile body;When there are tunnels on both sides of the anti-slide pile,earth pressure monitoring points should be arranged on both sides to obtain more complete earth pressure distribution data and conduct more accurate analysis.

关 键 词：隧道工程 抗滑桩 监测 开挖 内力变化 土侧压力 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]