茂县隧道挤压性变形段锚杆作用效果分析
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摘要
针对茂县隧道穿越活动断裂带及其影响区所遇到的挤压性变形问题,通过对1号斜井及左洞前期施工变形统计分析,以及现场锚杆施工存在的问题,针对性地提出锚杆施工工艺的改进措施,并开展长期跟踪监测。研究结果表明:锚杆工艺改进前,1号斜井和左洞收敛均值分别为689.2 mm和624.8 mm,且1号斜井变形不收敛,左洞收敛时间达6个月;锚杆工艺改进后,左、右洞水平收敛均值分别为320.4 mm和141.2 mm,相比左洞工艺调整前分别下降77.4%和40.6%,且收敛时间缩短至约4个月;按"孔腔通畅+非收缩浆液+可简单验证和不可逆转灌注满浆"的思路综合性改进锚杆施工工艺可显著提升锚杆质量,发挥其在抑制隧道挤压性变形中应有的作用。
Aiming at addressing the compressive deformation of Maoxian tunnel passing through active fault zone,based on the statistical analysis of the deformation of No.1 incline shaft and left tunnel at the early stage, as well as the study of the construction of bolt at site, an improved construction technology of bolt was proposed, and long-term monitoring were carried out. The results show that: Without any improved technology being applied,the mean convergence values of the No. 1 inclined shaft and the left tunnel are 689.2 mm and 624.8 mm,respectively, and the deformation of the No. 1 inclined shaft does not converge, and the convergence time of the left tunnel is up to 6 months; After the improved technology for bolt is performed, the horizontal convergence average values of the left and right tunnels are 320.4 mm and 141.2 mm, respectively, which are 77.4% and 40.6%lower than before, and the convergence time is shortened to about 4 months; According to the idea of ‘open hole +non-shrinking slurry + simple verification and irreversibly fully pouring slurry', the bolt construction technology can be comprehensively improved, which significantly improve the quality of the bolt and then achieve its supposed role in suppressing the compressive deformation in tunnel construction.
Aiming at addressing the compressive deformation of Maoxian tunnel passing through active fault zone,based on the statistical analysis of the deformation of No.1 incline shaft and left tunnel at the early stage, as well as the study of the construction of bolt at site, an improved construction technology of bolt was proposed, and long-term monitoring were carried out. The results show that: Without any improved technology being applied,the mean convergence values of the No. 1 inclined shaft and the left tunnel are 689.2 mm and 624.8 mm,respectively, and the deformation of the No. 1 inclined shaft does not converge, and the convergence time of the left tunnel is up to 6 months; After the improved technology for bolt is performed, the horizontal convergence average values of the left and right tunnels are 320.4 mm and 141.2 mm, respectively, which are 77.4% and 40.6%lower than before, and the convergence time is shortened to about 4 months; According to the idea of ‘open hole +non-shrinking slurry + simple verification and irreversibly fully pouring slurry', the bolt construction technology can be comprehensively improved, which significantly improve the quality of the bolt and then achieve its supposed role in suppressing the compressive deformation in tunnel construction.
引文
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[12]祁贤.木寨岭隧道软岩大变形施工技术措施研究[J].铁道建筑技术,2018(3):86-89.QI Xian.Study on construction technology measures of soft rock large deformation in Muzhailing tunnel[J].Railway Construction Technology,2018(3):86-89.
[13]胡元芳,刘志强,王建宇.高地应力软岩条件下挤压变形预测及应用[J].现代隧道技术,2011,48(3):28-34.HU Yuanfang,LIU Zhiqiang,WANG Jianyu.Squeezing deformation prediction of soft rocks under high ground stress and its application[J].Modern Tunnelling Technology,2011,48(3):28-34.
[2]孙均,潘晓明,王勇.隧道软弱围岩挤压大变形非线性流变力学特征及其锚固机制研究[J].隧道建设,2015(10):969-980.SUN Jun,PAN Xiaoming,WANG Yong.Study on nonlinear rheologic mechanical property of squeezing deformation of soft surrounding rock in tunneling and its anchorage mechanism[J].Tunnel Construction,2015(10):969-980.
[3]汪波,王杰,吴德兴,等.让压支护技术在软岩大变形隧道中的应用探讨[J].公路交通科技,2015(5):115-122.WANG Bo,WANG Jie,WU Dexing,et al.Discussion on application yielding supporting technology in large deformation tunnel in soft rock[J].Journal of Highway and Transportation Research and Development,2015(5):115-122.
[4]赵福善.兰渝铁路两水隧道高地应力软岩大变形控制技术[J].隧道建设,2014(6):546-553.ZHAO Fushan.Technologies to control serious deformation of soft rocks with high ground stress:case study on Liangshui tunnel on Lanzhou-Chongqing railway[J].Tunnel Construction,2014(6):546-553.
[5]高世军.家竹菁隧道整治大变形的主要措施[J].现代隧道技术,1998(1):52-56.GAO Shijun.Main techniques for the regulation of large deformation in the Jiazhuqing tunnel[J].Modern Tunnelling Technology,1998(1):52-56.
[6]张祉道.关于挤压性围岩隧道大变形的探讨和研究[J].现代隧道技术,2003,40(2):5-12.ZHANG Zhidao.Discussion and research on large deformation of tunnel in extruded surrounding rock[J].Modern Tunnelling Technology,2003,40(2):5-12.
[7]王建宇,胡元芳,刘志强.高地应力软弱围岩隧道挤压型变形和可让性支护原理[J].现代隧道技术,2012,49(3):9-17.WANG Jianyu,HU Yuanfang,LIU Zhiqiang.Tunneling in squeezing ground with yielding supports[J].Modern Tunnelling Technology,2012,49(3):9-17.
[8]肖广智.铁路隧道施工主动控制变形技术研究与实践[J].隧道建设,2018,38(7):1087-1094.XIAO Guangzhi.Study and application of active control deformation technology to railway tunnel construction[J].Tunnel Construction,2018,38(7):1087-1094.
[9]仇文革,王刚,龚伦,等.一种适应隧道大变形的限阻耗能型支护结构研发与应用[J].岩石力学与工程学报,2018,37(8):1785-1795.QIU Wenge,WANG Gang,GONG Lun,et al.Research and application of resistance-limiting and energydissipating support in large deformation tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(8):1785-1795.
[10]李国良,朱永全.乌鞘岭隧道高地应力软弱围岩大变形控制技术[J].铁道工程学报,2008(3):54-59.LI Guoliang,ZHU Yongquan.Control technology for large deformation of highland stressed weak rock in Wushaoling tunnel[J].Journal of Railway Engineering Society,2008(3):54-59.
[11]汪伟.新城子隧道小间距段施工及测试分析[J].铁道建筑技术,2017(12):88-91.WANG Wei.Construction and test analysis of small spacing section of Xincheng sub tunnel[J].Railway Construction Technology,2017(12):88-91.
[12]祁贤.木寨岭隧道软岩大变形施工技术措施研究[J].铁道建筑技术,2018(3):86-89.QI Xian.Study on construction technology measures of soft rock large deformation in Muzhailing tunnel[J].Railway Construction Technology,2018(3):86-89.
[13]胡元芳,刘志强,王建宇.高地应力软岩条件下挤压变形预测及应用[J].现代隧道技术,2011,48(3):28-34.HU Yuanfang,LIU Zhiqiang,WANG Jianyu.Squeezing deformation prediction of soft rocks under high ground stress and its application[J].Modern Tunnelling Technology,2011,48(3):28-34.