浸水浅埋黄土隧道复合地基受力性状试验研究  

Experimental Study on the Mechanical Behavior of Composite Foundation of Submerged Shallow Buried Loess Tunnel

作　　者：胡昆昆 何勇[2] 李又云[3] 刘路路 Hu Kunkun;He Yong;Li Youyun;Liu Lulu(China Railway Tunnel Consultants Co.,Ltd.,Guangzhou 510000,P.R.China;Institute of Geotechnical Engineering,Southeast University,Nanjing 211189,P.R.China;Key Laboratory for Special Area Highway Engineering,Ministry of Education,Chang'an University,Xi'an 710064,P.R.China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 2100096,P.R.China)

机构地区：[1]中铁隧道勘察设计研究院有限公司,广州510000 [2]东南大学岩土工程研究所,南京211189 [3]长安大学特殊地区公路工程教育部重点实验室,西安710064 [4]中国矿业大业深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《地下空间与工程学报》2023年第3期867-880,共14页Chinese Journal of Underground Space and Engineering

基　　金：江苏省科研创新计划(KYCX19-0098)。

摘　　要：湿陷变形是黄土隧道建设与运维过程中一直面临的难题,其中复合基底在黄土隧道建造中发挥着关键作用,有效缓解了黄土隧道的湿陷变形问题。为了研究湿陷性黄土地层隧道复合基底承载力及其湿陷变形问题,通过室内大型模型试验,研究了复合基底浸水和未浸水工况下基底受力变形性状,结果表明:较天然基底,复合基底各测点应力响应深度有所增大,基本都在60 cm以内,但基底土体应力减小幅度较无桩工况有所减小;浸水能提高复合基地桩顶和桩间接触压力,但桩顶压力变化趋势相对较大;此外,浸水作用能降低加固区应力增量,下卧层应力增量有所增大。Collapse deformation is a difficult problem that has been faced during the construction,operation and maintenance of loess tunnels.Composite basement plays a key role in the construction of loess tunnels,effectively alleviating the collapse deformation problem of loess tunnels.In order to study the bearing capacity and collapsible deformation of the composite basement of tunnel in collapsible loess stratum,the stress and deformation characteristics of the composite basement under water immersion and non-water immersion conditions are studied through indoor large-scale model test method.The results show that the stress response depth of each measuring point of the composite basement is larger than that of the natural basement,which is basically within 60cm.However,the decreasing range of soil stress in the foundation is smaller than that without pile;Water immersion can increase the contact pressure between pile top and pile,but the changing trend of pile top pressure is relatively large;In addition,water immersion can reduce the stress increment in the reinforcement area and increase the stress increment in the underlying layer.

关 键 词：黄土隧道 浸水作用 受力性状 模型试验 

分 类 号：TU231[建筑科学—建筑设计及理论]