双排抗滑圆桩-斜穿隧道-滑坡体地震动效应的模型试验研究  

Modeling and Experimental Study on Seismic Effects of Double-Row Antislide Round Piles in Tunnel Obliquely Crossing Landslide Mass

作　　者：施英 任国俊 吴红刚 韦洪 吕小强 冯康 SHI Ying;REN Guojun;WU Honggang;WEI Hong;LYU Xiaoqiang;FENG Kang(Gansu Province Transportation Planning,Survey&Design Institute Co.,Ltd.,Lanzhou 730070,Gansu,China;College of Resources and Environmental Engineering,Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,Guizhou,China;Northwest Research Institute Co.,Ltd.of CREC,Lanzhou 730070,Gansu,China;Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621000,Sichuan,China)

机构地区：[1]甘肃省交通规划勘察设计院股份有限公司,甘肃兰州730070 [2]贵州大学资源与环境工程学院喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025 [3]中铁西北科学研究院有限公司,甘肃兰州730070 [4]西南科技大学土木工程与建筑学院,四川绵阳621000

出　　处：《隧道建设（中英文）》2023年第6期1012-1026,共15页Tunnel Construction

基　　金：甘肃省自然科学基金(21JR7RA738);甘肃省青年科技基金项目(22JR5RA777);中铁九局集团有限公司大连分公司科技开发项目(DLFML-JSFW-2021-09);中铁科研院(科研)字(2017-KJ008-Z008-03)。

摘　　要：为研究地震作用下滑坡地段双排圆桩对隧道斜穿滑坡体系的加固效果,以实际工程案例为依托,通过室内振动台试验,对坡体变形破坏过程展开相关分析,以及对桩和隧道结构的动力响应情况进行研究,并对桩和隧道进行震动响应因素间相关性分析。结果表明:1)在抗滑桩约束作用下,坡体并不是完全按照滑面开始滑移破坏的,实际滑移面从滑体表层逐渐向滑体深层发展;2)坡面主要是沿着抗滑桩走向产生较为严重的破坏,这可能是由于应力沿桩群传播导致,“梅花形”布置的双排圆桩对坡体具有较好的支挡效果,一定程度上保证了滑体的整体性;3)抗滑桩对加速度的放大效应有一定的抑制作用;4)后排抗滑桩承担了大部分的滑坡推力,主要来自于深层滑体的推力;5)传感器采集到的峰值加速度几乎随着与震动台面的距离增大而增大,隧道与抗滑桩具有较大的相关性。To analyze the reinforcement effect of double-row round piles on a tunnel obliquely crossing landslide mass under seismic action,the landslide mass deformation is investigated using an indoor vibration platform.Furthermore,the dynamic response of the pile and tunnel structure is analyzed as well as the correlation analysis between the vibration response parameters of the pile and tunnel.The following conclusions are drawn:(1)Under the constraint of antislide piles,the landslide mass partially slides and fails on the sliding surface,and the actual sliding surface gradually develops from the surface of the landslide mass to the deep layer of the landslide mass.(2)The landslide surface primarily undergoes severe damage along the direction of antislide piles,which may be caused by stress propagation along the pile group.The double-row round piles arranged in a quincunx shape have a strong retention effect,ensuring landslide mass integrity to a certain extent.(3)The antislide pile has an inhibitory influence on the acceleration amplification effect.(4)The rear antislide piles bear the majority of the landslide thrust,which originates predominantly in the deep landslide mass.(5)The peak acceleration collected by the sensor nearly increases with the distance from the vibration platform,and there is a substantial correlation between the tunnel and the antislide piles.

关 键 词：圆形抗滑桩 振动台 地震模型试验 隧道 滑坡 动力响应 

分 类 号：U45[建筑科学—桥梁与隧道工程]