“品”字型抗滑桩在舟曲锁儿头滑坡中的应用  

Application of 品-shaped anti-sliding piles in Suoertou landslide in Zhouqu

作　　者：任永忠[1,2] 朱彦鹏[1,2] 王秀丽[1,2] 周勇[1,2] 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《四川建筑科学研究》2014年第3期113-116,共4页Sichuan Building Science

基　　金：国家科技支撑计划项目(2011BAK12B07);甘肃省自然科学基金(1208KJ2A158);兰州理工大学红柳青年教师培养计划项目(Q201108)

摘　　要：舟曲"8·8"特大泥石流地质灾害引发的次生灾害不容忽视,锁儿头滑坡就是其中一例。在锁儿头滑坡治理中,首次提出"品"字型组合截面抗滑桩,为此本文在其设计的基础上采用有限差分FLAC3D软件进行数值分析,其分析结果表明:首先通过较长的水平段以消散滑坡后缘传来的下滑力,其次通过设置抗滑桩以起到防治的效果,抗滑桩设置位置合理;桩身的受力与周围岩土体特性相关性较大,岩石较为破碎,桩身受力较小,反之,受力较大;群桩设计间距为7.0 m,通过分析间距偏小,不能形成土拱效应,形成的应力分布类似于挡土墙结构,可考虑适当加大群桩间距以使抗滑桩受力合理进而节省成本。Zhouqu ＂8 · 8＂ large landslides geological disasters triggered secondary disasters can not be ignored, Suoertou landslide is one example. In the Suoertou Landslide, first proposed the 品-shaped composite section anti-piles, this article in its design based on the finite difference software FLAC3D numerically analyzed, the analysis results show that： first through the long horizontal section to dissipate landslide trailing edge came downslide strength, followed by setting anti-piles in order to play the effect of prevention, anti-slide pile set reasonable position ; pile of the force with the surrounding rock mass characteristics associated with greater, more rock crushing, pile sustaining a smaller force, on the contrary, a larger force;pile group design spacing 7.0m, by analyzing the spacing is too small, can not form the soil arching effect, the formation of the stress distribution is similar to retaining structures, considered appropriate to increase the spacing of pile groups to make piles reasonable force and thus save costs.

关 键 词：锁儿头 抗滑桩 滑坡 土拱效应 数值分析 

分 类 号：U216.419[交通运输工程—道路与铁道工程] TU473[建筑科学—结构工程]