盾构隧道同步注浆材料外加剂黄原胶的研究与应用
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摘要
盾构同步浆液由于凝固时间较长,浮力长期存在,直接导致组成隧道的管片错台、破损和隧道超限等问题,影响到地铁隧道的验收与运营。文章分析了管片上浮作用机理,提出了同步浆液对管片的广义浮力及广义浮力密度概念,通过在同步浆液中加入黄原胶,取代常规同步浆液中的膨润土,极大提高了同步浆液的假塑性。通过简单的试验计算分析得出:加入黄原胶的新型同步浆液静置10 min,由于其特有的假塑性比常规同步浆液对管片的广义浮力降低许多,甚至广义浮力接近为0。通过成都地铁某盾构区间隧道实际应用表明:添加黄原胶的新型同步浆液有效填充了管片与开挖面之间的间隙,基本解决了盾构隧道上浮的难题。
The buoyancy and long setting time of the mortar used for simultaneous grouting in shield tunnel con-struction lead directly to the problems of a staggered segment, damage and tunnel clearance invasion, which affectthe acception and operation of metro tunnels. The mechanism of segment uplift is analyzed, and the concepts ofgeneralized buoyancy and buoyancy density of segment are put forward. The conventional bentonite is replaced byxanthan gum for simultaneous grouting, and this greatly increases the pseudoplasticity of the mortar. Experimentcalculations and analysis show that after ten minutes the generalized buoyancy of the mortar with the xanthan gumdecreases greatly compared with that of conventional mortar due to its special pseudoplasticity, and the buoyancy isclose to zero. Practical application in the Chengdu metro shows that the mortar with xanthan gum effectively fills thegap between the segment and the excavation profile, and the problem of uplift of the shield tunnel can basically besolved.
The buoyancy and long setting time of the mortar used for simultaneous grouting in shield tunnel con-struction lead directly to the problems of a staggered segment, damage and tunnel clearance invasion, which affectthe acception and operation of metro tunnels. The mechanism of segment uplift is analyzed, and the concepts ofgeneralized buoyancy and buoyancy density of segment are put forward. The conventional bentonite is replaced byxanthan gum for simultaneous grouting, and this greatly increases the pseudoplasticity of the mortar. Experimentcalculations and analysis show that after ten minutes the generalized buoyancy of the mortar with the xanthan gumdecreases greatly compared with that of conventional mortar due to its special pseudoplasticity, and the buoyancy isclose to zero. Practical application in the Chengdu metro shows that the mortar with xanthan gum effectively fills thegap between the segment and the excavation profile, and the problem of uplift of the shield tunnel can basically besolved.
引文
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[2]林家祥,段创峰,赵艳鹏,谢彬.模型隧道新型浆液抗浮试验研究[J].城市道桥与防洪,2008,8(8):157-160.LIN Jiaxiang,DUAN Chuangfeng,ZHAO Yanpeng,XIE Bin.Study of New Mortar Anti-floating Model Experiment of Tunnel[J].Urban Roads Bridges&Flood Control,2008,8(8):157-160.
[3]杨志全,侯克鹏,郭婷婷,马秋.基于考虑时变性的宾汉姆流体的渗透注浆机理研究[J].四川大学学报(工程科学版),2011,43(增1):67-72.YANG Zhiquan,HOU Kepeng,GUO Tingting,MA Qiu.Study on Permeation Grouting Mechanism Based on Bingham Fluid of Time-Dependent Behavior[J].Journal of Sichuan University(Engineering Science Edition),2011,43(S1):67-72.
[4]戴志仁.盾构隧道盾尾管片上浮机理与控制[J].中国铁道科学,2013,34(1):59-65.DAI Zhiren.The Mechanism and Control Principle of Upward Movements of Segments at the Rear of Shield Tail[J].China Railway Science,2013,34(1):59-65.
[5]任宏洋,王新惠.黄原胶的特性、生产及应用进展[J].酿酒,2010,37(2):17-19.REN Hongyang,WANG Xinhui.Study on Production,Properties and Development of Xanthan Gum[J].Liquor Making,2010,37(2):17-19.
[6]谭旖宁.黄原胶的生物合成及其在食品工业中的应用进展[J].广东农业科学,2010,(7):144-146.TAN Yining.Biosynthesis of Xanthan Gum and its Application Progression in Food Industry[J].Agriculture Science of Guangdong,2010,(7):144-146.
[7]季昌,周顺华,许恺,李晓龙.盾构隧道管片施工期上浮影响因素的现场试验研究[J].岩土力学与工程学报,2013,32(增2):3619-3626.JI Chang,ZHOU Shunhua,XU Kai,LI Xiaolong.Field Test Research on Influence Factor of Upward Moving of Shield Tunnel Segments during Construction[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(S2):3619-3626.