摘要
G4216线仁寿经沐川至新市高速公路止点发育多处巨型滑坡,且新市镇作为仁沐新高速、宜新高速、新金高速、串新高速等4条高速公路转换的重要结点,有设落地互通的需求;因此给新市互通区的工程防护、处治设计提出了巨大挑战。在室内试验结合工程现状反算的基础上综合确定滑带土力学参数,再通过滑坡剩余推力计算,得到主滑断面最大剩余下滑力为16 720 k N/m,远超支挡结构提供的极限抗滑强度。结合互通区构造物设计、路基标高、滑坡推力等因素确定了分区处治方案:清方减载实现整体稳定;前缘设桩加固次级滑面;后缘设锚杆(索)加固清方形成的高边坡;采用小截面抗滑桩支挡顶部中小型滑坡;结合坡面截排水措施共同防护。
The Xinshi town is very important for the highway network since four expressways intersect here and they are the Renmuxin road,Yibin-Xinshi road Xinshi-Jinyang road and Chuansi-Xinshi road.It is necessary to build a interchange at the town.However,serval giant landslides were discovered around the place where is planned to construct the interchange.Those brought great challenge to the engineering protection of the interchange and the controlling design for the landslides.Based on the laboratory experiment and engineering condition,the force parameters of the sliding soil were back calculated.Hence,the maximum residual thrust of the main sliding surface is 16720 kN/m by calculated the residual thrust of the four sliding surfaces.Taking consideration into the construction design of the interchange,the road elevation and the residual thrust,the distributed treatment were applied on the controlling scheme of these giant landslide.Firstly,reducing the load to make sure the whole stability;Secondly,anti-slide piles are fixed at front of the slide to reinforce the secondary slide surface;Thirdly,anchor bolts or cables are driven into the slope after the load reduction;Fourthly,the anti-slide piles which has small cross-section are used to support the medium and the small landslide at the top;Finally,the drainage and interception measurements both protect the landslide from the water.
作者
王东
张婧
陈强
顾涛
王有成
WANG Dong;ZHANG Jing;CHEN Qiang;GU Tao;WANG Youcheng(Highway Planning Survey&Design Institute,Sichuan Communications Department,Chengdu 610041 China;School of Energy and Power Engineering,Xihua University,Chengdu 610039 China)
出处
《西华大学学报（自然科学版）》
CAS
2019年第1期40-45,共6页
Journal of Xihua University:Natural Science Edition
基金
国家自然科学基金青年科学基金资助项目(51409224)
四川省交通科技项目(2012A2-4
2015A1-9)
关键词
互通区
巨型滑坡
稳定性评价
滑带土
分区处治
expressway interchange
giant landslide
stability assessment
sliding-zone soil
distributed treatment
