隧道砂卵石围岩超前小导管注浆参数优化研究
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摘要
隧道砂卵石围岩具有结构松散、级配分布不均匀,透水性强的特点,在进行注浆加固地层时,应合理确定注浆参数。以甘肃省渭武高速白鹤桥隧道为工程依托,结合砂卵石地层的特点,针对单水泥浆浆液易析水、水泥颗粒易沉降、凝结时间难控制、结石体易收缩、注浆压力及小导管间距难确定等问题,通过室内注浆材料试验、改性普通硅酸盐水泥性能试验及注浆模型试验对注浆加固参数进行优化设计,并提出相应的注浆控制标准。研究结果表明,最优注浆参数为:水灰比为1∶1;水玻璃波美度为38Be′,用量为3%;悬浮剂用量为1.4%;注浆压力取0.2 MPa;注浆小导管间距取30 cm。
The sand and gravel surrounding rock of the tunnel is characterized by loose structure, uneven gradation and strong permeability. Grouting parameters should be determined reasonably for grouting and strengthening the stratum. Based on the project of Baiheqiao tunnel of Weiwu highway in Gansu province, combined with the characteristics of sandy pebble formation, and in view of such challenges as the easy drainage of the single cement slurry, the cement particle sedimentation, the difficult to control the setting time, the easy contract of the stone body, the grouting pressure and small conduit spacing, indoor grouting material test, modified ordinary Portland cement grouting materials test and grouting model test are conducted to optimize the grouting reinforcement parameters, and corresponding grouting control standards are put forward. The results show that the optimal grouting parameters are as the followings: water-cement ratio is 1∶1; water glass baume degree is 38° of 3% dosage; dosage of the suspending agent is 1.4%; grouting pressure is 0.2 MPa and spacing of the grouting catheter is 30 cm.
The sand and gravel surrounding rock of the tunnel is characterized by loose structure, uneven gradation and strong permeability. Grouting parameters should be determined reasonably for grouting and strengthening the stratum. Based on the project of Baiheqiao tunnel of Weiwu highway in Gansu province, combined with the characteristics of sandy pebble formation, and in view of such challenges as the easy drainage of the single cement slurry, the cement particle sedimentation, the difficult to control the setting time, the easy contract of the stone body, the grouting pressure and small conduit spacing, indoor grouting material test, modified ordinary Portland cement grouting materials test and grouting model test are conducted to optimize the grouting reinforcement parameters, and corresponding grouting control standards are put forward. The results show that the optimal grouting parameters are as the followings: water-cement ratio is 1∶1; water glass baume degree is 38° of 3% dosage; dosage of the suspending agent is 1.4%; grouting pressure is 0.2 MPa and spacing of the grouting catheter is 30 cm.
引文
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[21] 李鹏,张庆松,张霄,等.基于模型试验的劈裂注浆机制分析[J].岩土力学,2014,35(11):3221-3230.
[2] 杨米加,陈明雄,贺永年.注浆理论的研究现状及发展方向[J].岩石力学与工程学报,2001,20(6):839-841.
[3] 战玉宝,宋晓辉,陈明辉.岩土注浆理论研究进展[J].路基工程,2010(2):20-22.
[4] 黄文杰,罗光财,彭丹,等.富水砂卵石层袖阀管注浆参数优化研究与实践[J].施工技术,2017,46(S2):242-246.
[5] 贾军.富水砂卵石地层地铁车站袖阀管注浆加固技术[J].施工技术,2016,45(S2):206-209.
[6] 张明.隧道强透水砂砾地层袖阀管地表注浆加固工艺研究[J].隧道建设,2014,34(10):975-980.
[7] 沈琦.超前长小导管加固技术在砂卵石地层隧道施工中的应用[J].市政技术,2016,34(4):104-107.
[8] 王淳,巨建民,任小惠.超前小导管在斜穿砂卵石隧道中的作用[J].低温建筑技术,2015,37(5):131-133.
[9] 王天彪,周明洋.富水砂卵石地层注浆加固试验研究[J].山西建筑,2017,43(3):59-62.
[10] 李润军.北京地铁七号线达官营站及湾达区间暗挖关键技术研究[D].北京:中国矿业大学(北京),2014.
[11] 王复明,倪伟伟,董新平,等.砂土地层隧道小导管注浆模型试验研究[J].中外公路,2010,30(1):208-211.
[12] 魏晨亮,王玉卿,唐高洪.南宁地区富水圆砾层袖阀管注浆加固技术[J].隧道建设,2014,34(5):499-502.
[13] 王国义.成都砂卵石地层注浆加固技术应用[J].隧道建设(中英文),2012,32(5):696-699.
[14] 李享松,覃娟,罗概,等.富水砂卵石地层注浆参数优化研究[J].铁道科学与工程学报,2016,13(3):469-475.
[15] Chai J,Cui W.Optimum thickness of curtain grouting on dam foundation with minimum seepage pressure resultant[J].Structural & Multidisciplinary Optimization,2012,45(2):303-308.
[16] Zhang Z Q,Hua-Yun L I,Chuan H E.Study on Whole Section Curtain Grouting Technique and Parameters Optimization in Subsea NATM Tunnel[J].Journal of the China Railway Society,2011,33(2):86-90.
[17] 谢雄耀,王强,齐勇,等.圆砾泥岩复合地层泥水盾构下穿房屋沉降控制技术研究[J].岩土工程学报,2017,39(9):1591-1599.
[18] 杨坪,唐益群,彭振斌,等.砂卵(砾)石层中注浆模拟试验研究[J].岩土工程学报,2006,28(12):2134-2138.
[19] 秦鹏飞,符平.稳定性浆液在砂砾石土中灌浆的对比试验研究[J].中国农村水利水电,2014(5):111-114.
[20] 张庆松,张连震,刘人太,等.基于“浆-土”界面应力耦合效应的劈裂注浆理论研究[J].岩土工程学报,2016,38(2):323-330.
[21] 李鹏,张庆松,张霄,等.基于模型试验的劈裂注浆机制分析[J].岩土力学,2014,35(11):3221-3230.