兰州地铁下穿黄河段同步注浆参数控制研究
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摘要
以兰州轨道交通1号线泥水盾构下穿砂卵石黄河地层为工程背景,对同步注浆施工过程中的浆液类型、注浆压力、注入率、注浆量以及注浆速率参数进行研究.通过统计与有限元方法分析,得到如下结论:对比三种同步注浆浆液的类型的优缺点,得到同步注浆的浆液为单液硬性浆,然后用有限元软件Plaxis对下穿黄河段注浆压力进行数值分析,计算了隧道中心线埋深分别为15 m、21 m、27 m情况下,注浆压力为0.2 MPa、0.4 MPa、0.6 MPa、0.8 MPa、1.0 MPa下盾构隧道中心线位移,确定盾构隧道穿越黄河段的注浆压力为0.4 MPa;分析现场盾构施工实际参数,得到注浆率控制在130%～180%,注浆量为4.3～6 m~3,注浆速率为0.07～0.17 m~3/min.
Based on the engineering background of slurry shield of Lanzhou Rail Transit Line 1 tunneling through sandy and pebble Yellow River stratum,the grouting type,grouting pressure,grouting rate,grouting volume and grouting rate parameters in the process of synchronous grouting construction are studied.Through statistical analysis and finite element analysis,the following conclusions are drawn:by comparing the advantages and disadvantages of the three types of synchronous grouting slurry,it is concluded that the synchronous grouting slurry is a single-fluid hard slurry.Then the grouting pressure of the down-traversing section of the Yellow River is numerically analyzed by using the finite element software Plaxis.When the depth of the tunnel center line is 15 m,21 m and 27 m,the grouting pressure is 0.2 MPa,0.4 MPa,0.6 MPa,0.8 MPa,1.0 MPa under each depth,the center line displacement of the shield tunnel is calculated.The grouting pressure of the tunnel crossing the Yellow River section is 0.4 MPa.Based on the analysis of the actual parameters of shield tunnel construction,the grouting rate is controlled at 130%～180%,the grouting volume is 4.3～6 m~3, and the grouting rate is 0.07～0.17 m~3/min.
Based on the engineering background of slurry shield of Lanzhou Rail Transit Line 1 tunneling through sandy and pebble Yellow River stratum,the grouting type,grouting pressure,grouting rate,grouting volume and grouting rate parameters in the process of synchronous grouting construction are studied.Through statistical analysis and finite element analysis,the following conclusions are drawn:by comparing the advantages and disadvantages of the three types of synchronous grouting slurry,it is concluded that the synchronous grouting slurry is a single-fluid hard slurry.Then the grouting pressure of the down-traversing section of the Yellow River is numerically analyzed by using the finite element software Plaxis.When the depth of the tunnel center line is 15 m,21 m and 27 m,the grouting pressure is 0.2 MPa,0.4 MPa,0.6 MPa,0.8 MPa,1.0 MPa under each depth,the center line displacement of the shield tunnel is calculated.The grouting pressure of the tunnel crossing the Yellow River section is 0.4 MPa.Based on the analysis of the actual parameters of shield tunnel construction,the grouting rate is controlled at 130%～180%,the grouting volume is 4.3～6 m~3, and the grouting rate is 0.07～0.17 m~3/min.
引文
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[3] 赵旭伟,谈晶,于清浩.砂卵石地层盾构推进对地表沉降影响数值分析[J].城市轨道交通研究,2012(4):33-36.
[4] 张载松.盾构壁后注浆对隧道及地表沉降影响的研究[D].济南:山东大学,2014.
[5] 吕乾乾.地铁盾构隧道同步注浆施工对地层沉降影响的预测分析[D].天津:天津大学,2012.
[6] 张励.盾构掘进参数对地表沉降影响分析[D].北京:北京交通大学,2012.
[7] 汪国锋.北京砂卵石地层土压平衡盾构土体改良技术试验研究[D].北京:中国地质大学(北京),2011.
[8] 滕丽,张桓.盾构穿越砂箩日石地层地表沉降特征细宏观分析[J].岩土力学,2012,33(4):1141-1150.
[9] 卢海林,赵志民,方芃,等.盾构法隧道施工引起土体位移与应力的镜像分析方法[J].岩土力学,2007,28(1):45-50.
[10] 郭建涛.粉土粉砂地层盾构掘进参数优化预测研究[D].北京:北京交通大学,2010.
[11] 罗恒.注浆理论研究及其在公路工程中的应用[D].长沙:中南大学,2010.
[12] 梁精华.盾构隧道壁后注浆材料配比优化及浆体变形特性研究[D].南京:河海大学,2006.
[13] 魏纲,魏新江,洪杰.盾构隧道壁后注浆机理及其对周边环境的影响[J].防灾减灾工程学报,2010,30(增刊1):299-304.
[14] 司翔宇.盾构推进引起周围土体变形的预测和控制研究[D].南京:南京林业大学,2009.
[15] 叶飞,苟长飞,毛家骅,等.黏土地层盾构隧道临界注浆压力计算及影响因素分析[J].岩土力学,2015,36(4):937-945.