高地应力软岩隧道衬砌裂损重新施作段结构安全性分析
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摘要
为研究高地应力软岩隧道衬砌裂损重新施作段结构的安全性,依托木寨岭隧道衬砌裂损段,通过现场监测和数值模拟的方法,分析高地应力软岩隧道衬砌裂损重新施作段结构变形受力特征,进而分析结构的安全性。现场监测结果表明:衬砌裂损重新施作后,前3层支护几乎承担了所有的围岩压力和变形,通过层层支护、分层抵抗的方法来逐渐降低衬砌受力,保证衬砌结构的安全。通过数值计算对比分析衬砌重新施作前后的隧道受力变形状态,其中重新施作后衬砌各位置混凝土应力和钢筋应力增长趋势均不明显,计算得到衬砌裂损重新施作段结构安全系数均处于3. 3~8. 1,各位置安全系数均大于规范中的要求值,说明结构处于安全状态。
The safety of the reconstruction section of lining cracking in high geo-stress soft rock tunnel is important.Hence,the deformation and force characteristics of structure of the lining cracking section of Muzhailing Tunnel with high geo-stress soft rock are analyzed by field monitoring and numerical simulation. And then the safety of the structure is analyzed. The monitoring results show that most of the surrounding rock pressure and deformation is borne by the first three layers of support after reconstruction of lining cracking,and the lining stress is gradually reduced by layers of support,which can ensure the safety of the lining structure. The force and displacement states of tunnel before and after the reconstruction of lining cracking are analyzed by numerical calculation and comparison. The analytical results show that the growth trend of concrete stress and reinforcement stress in each position of lining after reconstruction are not obvious; it is calculated that the structural safety factors of the reconstruction section of lining cracking is in the range of 3. 3-8. 1,and the safety factors of each position is greater than those in the standard,which indicates that the structure is safe.
The safety of the reconstruction section of lining cracking in high geo-stress soft rock tunnel is important.Hence,the deformation and force characteristics of structure of the lining cracking section of Muzhailing Tunnel with high geo-stress soft rock are analyzed by field monitoring and numerical simulation. And then the safety of the structure is analyzed. The monitoring results show that most of the surrounding rock pressure and deformation is borne by the first three layers of support after reconstruction of lining cracking,and the lining stress is gradually reduced by layers of support,which can ensure the safety of the lining structure. The force and displacement states of tunnel before and after the reconstruction of lining cracking are analyzed by numerical calculation and comparison. The analytical results show that the growth trend of concrete stress and reinforcement stress in each position of lining after reconstruction are not obvious; it is calculated that the structural safety factors of the reconstruction section of lining cracking is in the range of 3. 3-8. 1,and the safety factors of each position is greater than those in the standard,which indicates that the structure is safe.
引文
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[2]黄强.小净距公路隧道施工中围岩地应力分析研究[D].武汉:武汉理工大学,2009.HUANG Qiang. Analysis of surrounding rock stress in construction of highway tunnels with small spacing[D].Wuhan:Wuhan University of Technology,2009.
[3]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.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.
[4]黄明利,赵建明,谭忠盛,等.兰渝铁路木寨岭隧道岭脊段衬砌-围岩结构体系变形受力特征分析[J].现代隧道技术,2016,53(6):89.HUANG Mingli,ZHAO Jianming,TAN Zhongsheng,et al.Analysis of the deformation and mechanical characteristics of the surrounding rock-lining structure of the Muzhailing Tunnel[J]. Modern Tunnelling Technology,2016,53(6):89.
[5]邹翀,尤显明,焦雷,等.高地应力软岩隧道圆形断面扩挖施工围岩及支护受力特征研究[J].隧道建设,2017,37(1):30.ZOU Chong,YOU Xianming,JIAO Lei,et al. Study of mechanical characteristics of surrounding rock and supporting structure of enlarging construction of circular soft rock tunnel with high ground stress[J]. Tunnel Construction,2017,37(1):30.
[6]尤显明,李沿宗.极高地应力软岩隧道超前导洞应力释放及多层支护变形控制技术[J].隧道建设,2017,37(7):832.YOU Xianming, LI Yanzong. Stress releasing and deformation control technology of multilayer support for pilot heading of a soft rock tunnel with extremely high ground stress[J]. Tunnel Construction,2017,37(7):832.
[7]李沿宗,尤显明,赵爽.极高地应力软岩隧道贯通段变形控制方案研究:以兰渝铁路木寨岭隧道为例[J].隧道建设,2017,37(9):1146.LI Yanzong, YOU Xianming, ZHAO Shuang. Study of deformation control scheme of breakthrough section of soft rock Muzhailing Tunnel on Lanzhou-Chongqing Railway with extremely high ground stress[J]. Tunnel Construction,2017,37(9):1146.
[8]闫鑫.高地应力软岩隧道超前应力释放变形控制机理及技术研究[D].北京:中国铁道科学研究院,2012.YAN Xin. Research on theory and technology of deformation control by stress pre-relief in soft rock tunnel with high initial geostress[D]. Beijing:China Academy of Railway Sciences,2012.
[9]邹翀,王超鹏,张文新,等.兰渝铁路木寨岭隧道炭质板岩段应力控制试验研究[J].隧道建设,2010,30(2):120.ZOU Chong,WANG Chaopeng,ZHANG Wenxin,et al.Experimental study on stress control in carbonaceous slate section of Muzhailing Tunnel on Lanzhou-Chongqing Railway[J]. Tunnel Construction,2010,30(2):120.
[10]叶康慨.木寨岭隧道大坪有轨斜井施工大变形分析及处理技术[J].隧道建设,2010,30(2):190.YE Kangkai. Case study of control of large deformation of Daping inclined shaft of Muzhailing Tunnel[J]. Tunnel Construction,2010,30(2):190.
[11]唐绍武,王庆林.木寨岭隧道大战沟斜井高地应力软岩大变形施工技术[J].隧道建设,2010,30(2):199.TANG Shaowu, WANG Qinglin. Case study of largedeformation control of Dazhangou inclined shaft of Muzhailing Tunnel in soft ground with high ground stress[J]. Tunnel Construction,2010,30(2):199.
[12]代伟,徐双永,杨喆坤.木寨岭隧道大坪斜井软岩大变形原因分析及施工技术[J].隧道建设,2010,30(2):169.DAI Wei,XU Shuangyong,YANG Zhekun. Technology for control of large deformation of Daping inclined shaft of Muzhailing Tunnel in soft ground[J]. Tunnel Construction,2010,30(2):169.
[13]师亚龙,郑波,刘志强,等.流变效应作用下高地应力铁路软岩隧道衬砌结构长期稳定性研究[J].铁道标准设计,2017,61(10):95.SHI Yalong,ZHENG Bo,LIU Zhiqiang,et al. Study of long term stability of tunnel lining structure in high stress soft rock tunnel under the effect of rheology[J]. Railway Standard Design,2017,61(10):95.
[14]郑阳焱.公路隧道衬砌裂损机理及结构安全性评价研究[D].长沙:中南大学,2014.ZHENG Yangyan. Study of generating mechanism of crack and safety assessment of tunnel lining[D]. Changsha:Central South University,2014.
[15]伍圣华.岑溪大隧道二次衬砌结构安全性评价[D].西安:长安大学,2015.WU Shenghua. Safety evaluation of secondary lining structure of Cenxi Great Tunnel[D]. Xi'an:Chang'an University,2015.