微型桩加固隧道仰坡稳定性分析  

Stability Analysis of the Slope Strengthened by Micropile

作　　者：金宇轩 JIN Yuxuan(Hunan Transportation Science Research Institute Co,Ltd,Changsha 410005,China)

机构地区：[1]湖南省交通科学研究院有限公司,湖南长沙410005

出　　处：《土木工程与管理学报》2023年第5期95-101,112,共8页Journal of Civil Engineering and Management

基　　金：湖南省交通运输厅科技创新项目(2022024)。

摘　　要：本文依托湖南某隧道仰坡抢险工程,通过数值模拟对微型桩群加固欠稳定边坡的效果进行了研究。研究表明:(1)采用微型桩对隧道仰坡进行加固,能够有效提高仰坡的安全系数、限制隧道开挖对仰坡的影响;(2)与大截面钢筋混凝土抗滑桩相比,微型桩施工迅速、施工风险低,既能大幅降低工程造价,又能满足工程进度要求,十分适用于抢险工程;(3)微型桩群中不同位置的微型桩的内力不同,前排的微型桩为主要承载体,在确保安全的前提下,可加大前排桩的尺寸,适当优化后排桩的设计,从而降低工程造价。微型桩施工便捷,加固效果显著,十分适用于边坡抢险加固工程。同时,对微型桩加固方案进行了优化,为类似工程的处理提供一定的参考。Based on the rescue project of the front slope of a high-speed tunnel in Hunan,this paper studied the effect of micropile on the reinforcement of unstable slope through numerical simulation.The research shows that:(1)strengthening the tunnel front slope with micropiles can effectively improve the calculated safety factor of the front slope and limit the influence of tunnel excavation on the front slope;(2)Compared with the large section reinforced concrete pile,the micropile has the advantages of rapid construction and low construction risk.It can not only greatly reduce the project cost,but also meet the requirements of project progress.It is very suitable for emergency projects;(3)The internal forces of micropiles at different positions in the micropile group are different.The micropiles in the front row are the main bearing body,and the micropiles in the rear row do not fully depend on their bearing capacity.In the design,the size of the front row piles should be increased and the size of the rear row piles should be appropriately reduced;The construction of micropile is convenient and the reinforcement effect is remarkable.It is very suitable for slope rescue and reinforcement engineering.At the same time,the micro pile reinforcement scheme is optimized in this paper.It provides a certain reference for the treatment of similar projects.

关 键 词：隧道仰坡 边坡支护 微型桩 数值模拟 深层测斜 

分 类 号：TU443[建筑科学—岩土工程] U457.3[建筑科学—土工工程]