湿陷性黄土地铁隧道基底注浆加固处治试验  

Experimental on grouting reinforcement and treatment of metro tunnel basement in collapsible loess

作　　者：侯乐乐 翁效林[1] 黄文鹏 周容名 刘伟萍 HOU Le-le;WENG Xiao-lin;HUANG Wen-peng;ZHOU Rong-ming;LIU Wei-ping(Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an 710064,Shaanxi,China)

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2022年第2期91-102,共12页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(U1934213)。

摘　　要：为保障黄土地区地铁隧道的运营安全,依托西安地铁八号线隧道工程,从改进离心模型试验系统中现有的浸水装置和应变测试系统出发,研发黄土地铁隧道基底注浆加固形式下的离心模型试验系统,通过对浸水系统的升级和光纤光栅(FBG)测试技术的应用实现了对离心测试系统的升级,并在此基础上开展了注浆加固处治隧道基底的离心模型试验。以处治范围、注浆角度和加固区强度作为主要控制性因素,通过分析上述因素对隧道结构弯矩、轴力、地表沉降以及隧道竖向位移的影响,评价不同注浆加固控制因素下隧道基底的处治效果。结果表明:注浆加固措施能有效控制隧道各点的弯矩、轴力、地表沉降和隧道整体竖向位移;注浆加固范围、注浆角度以及加固区强度均对控制隧道基底沉降有显著效果,注浆范围越大、注浆角度越大、加固区强度越大,相应的隧道基底湿陷变形控制越好;但过度增加注浆范围、注浆角度和加固区强度,隧道基底变形控制效果将不再显著;当地铁隧道基底湿陷性黄土厚度为9 m时,建议实际工程中注浆固处治范围取6 m,注浆角度取150°,注浆加固区强度取50 MPa,允许基底存在一定厚度的剩余湿陷量。In order to ensure the operation safety of metro tunnels in loess area,a model test system for loess metro tunnel base reinforcement in the form of grouting based on the tunnel project of Xi’an Metro Line 8 was developed.The centrifugal model test of grouting reinforcement of tunnel base was carried out.The research and development of centrifugal test system mainly from the improvement in the centrifugal model test system of existing immersion device and strain test system,through to the flooding system upgrade and the application of fiber Bragg grating(FBG)test technology of centrifugal test system upgraded,and on this basis to carry out the grouting reinforcement treatment tunnel basement of centrifugal model test.Treatment range,grouting angle and grout strength were taken as the main controlling factors,the influence of the above factors on the tunnel structure bending moment,axial force,surface settlement and vertical displacement of the tunnel were analyzed,so as to evaluate the treatment effect of the tunnel base under different grouting reinforcement control factors.The results show that the grouting reinforcement measures can effectively control the bending moment,axial force,surface settlement and overall vertical displacement of the tunnel.The range of grouting reinforcement,grouting angle and grouting strength have significant effect on controlling the settlement of tunnel base.The larger the grouting range,the larger the grouting angle and the larger the grout strength are,the better the corresponding control of tunnel basement subsidence deformation is.However,if the grouting range,grouting angle and grouting strength are continuously increased,the control effect of tunnel basement deformation is no longer significant.When the thickness of collapsible loess in the basement of metro tunnel is 9 m,it is recommended that the grouting fixation range should be 6 m,the grouting angle should be 150°,and the strength of the grouting slurry should be 50 MPa to allow the residual collapsibility of the base

关 键 词：隧道工程 城市地铁 黄土地区 注浆加固 离心模型试验 剩余湿陷量 

分 类 号：U457.3[建筑科学—桥梁与隧道工程] U231.3[交通运输工程—道路与铁道工程]