洞内注浆对盾构隧道竖向沉降的影响  

Uplift effect of grouting in tunnel on vertical settlement of shield tunnel

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作  者:魏纲[1,2] 李航 齐永洁 张治国 朱成伟[1] 韩凯航 WEI Gang;LI Hang;QI Yongjie;ZHANG Zhiguo;ZHU Chengwei;HAN Kaihang(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Department of Civil Engineering,Hangzhou City University,Hangzhou 310015,China;School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China)

机构地区:[1]浙江大学建筑工程学院,浙江杭州310058 [2]浙大城市学院土木工程系,浙江杭州310015 [3]上海理工大学环境与建筑学院,上海200093 [4]深圳大学土木与交通工程学院,广东深圳518060

出  处:《中南大学学报(自然科学版)》2025年第1期222-233,共12页Journal of Central South University:Science and Technology

基  金:浙江省基础公益研究计划项目(LGF22E080012)。

摘  要:为治理因下方新建隧道穿越或上方堆载等产生的隧道不均匀沉降,常采用隧道洞内注浆技术对沉降区域进行抬升。为研究洞内注浆对既有隧道竖向位移及轴线处附加应力的影响,首先,根据2个实际工况提出了隧道下方注浆圆柱模型;其次,考虑了注浆土体的体积膨胀作用及浆液的空间流动性,提出了非均匀体积膨胀注浆圆柱力学计算模型;最后,基于随机介质理论推导了注浆引起的隧道竖向抬升位移及轴线处的附加应力计算公式,研究了既有隧道沉降及轴线处附加应力在不同注浆参数(注浆量V、注浆体顶部与隧道底部距离H、注浆角度α)及不同纵向注浆方案下的变化规律。研究结果表明:隧道洞内注浆对隧道进行了有效抬升,计算所得抬升结果与工程实测结果较为吻合;随着注浆量V提高,既有隧道沉降变形逐渐减小,但当注浆量V过大时,将会导致既有隧道发生隆起变形;随着注浆圆柱顶部与隧道底部距离H增大,抬升量逐渐减小;随着注浆角度α增大,抬升量不断增大;沿隧道纵向采取非等量注浆方案并在沉降最大区域集中注浆能有效提高最大抬升量。In order to control the uneven settlement of tunnel caused by new tunnel crossing or overloading,grouting technology in tunnel is often used to lift the settlement area.In order to study the effect of grouting in the tunnel on the vertical displacement and the additional stress on the axis of the existing tunnel,firstly,a cylindrical model of grouting under the tunnel was proposed according to two actual working conditions.Secondly,considering the volumetric expansion of the grouting soil and the spatial fluidity of the slurry,a cylindrical mechanical calculation model of non-uniform volumetric expansion grouting was proposed.Finally,based on the random medium theory,the calculation formulas of vertical lift displacement and additional stress on the axis of the tunnel caused by grouting were derived.The influence of existing tunnel settlement and additional stress on different grouting parameters such as grouting volume(V),distance between the top of the grouting body and the bottom of the tunnel(H),grouting angle(α)and different longitudinal grouting schemes was studied.The results show that the tunnel is effectively lifted by grouting in the tunnel,and the calculated lifting results are in good agreement with the measured data.With the increase of the grouting volume(V),the settlement deformation of the existing tunnel gradually decreases.When the grouting volume(V)is too large,the existing tunnel will bulge and deform.As the distance between the top of the grouting cylinder and the bottom of the tunnel(H)increases,the lift decreases gradually.With the increase of grouting angle(α),the lift increases continuously.The maximum lift can effectively increase by adopting the non-equal grouting scheme along the tunnel and concentrating grouting in the area of maximum settlement.

关 键 词:盾构隧道 不均匀沉降 洞内注浆 附加应力 竖向位移 

分 类 号:TU43[建筑科学—岩土工程]

 

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