某铁路隧道衬砌脱空安全性分析及处治措施
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摘要
衬砌脱空是铁路隧道运营过程中的重要安全隐患,为进一步明确衬砌脱空安全性影响,依托某铁路隧道缺陷整治工程,基于FLAC软件建立分析模型,探究了在不同脱空位置、不同脱空程度的情况下衬砌安全性影响规律,并结合工程实际制定了切实可行的整治方案,经多年检验证明了方案的有效性。研究结果表明:脱空主要不良影响在于恶化结构受力,降低结构安全性;脱空部位距离拱脚越近,内力增长越为明显,结构安全性越低;随脱空高度的增加,结构安全性逐渐降低,同时结构危险点从拱脚转移至脱空部位;出现非对称性脱空时,除脱空部位临近范围外,非脱空侧安全性均小于对应的脱空侧部位,故非脱空侧结构安全也需予以重视。
Lining void is an important safety hazard in the operation of railway tunnels,in order to further clarify the impact of tunnel lining on the structural safety of railway tunnel lining,based on a railway tunnel defect regulation project,an analysis model based on FLAC software is established to explore the effect of lining safety under different removal positions and different degrees of void is explored,and a feasible and effective method for lining off the lining is worked out in combination with the engineering practice. The results of the study show that: the main adverse effect of void is to increase the internal force of structure,deteriorate the stress of structure,and reduce structural safety; The closer the void location is from the arch foot,the more obvious the internal force growth is,the lower the structural safety; as the thickness of the voids increases,the structural safety gradually decreases,and the structural dangerous point is shifted from the arch foot to the void part; in the case of asymmetrical voiding,the non-vacuum side safety is smaller than the corresponding void-free side except for the proximity of the voided part. Therefore,the safety of the non-vacuumed side structure also needs attention.
Lining void is an important safety hazard in the operation of railway tunnels,in order to further clarify the impact of tunnel lining on the structural safety of railway tunnel lining,based on a railway tunnel defect regulation project,an analysis model based on FLAC software is established to explore the effect of lining safety under different removal positions and different degrees of void is explored,and a feasible and effective method for lining off the lining is worked out in combination with the engineering practice. The results of the study show that: the main adverse effect of void is to increase the internal force of structure,deteriorate the stress of structure,and reduce structural safety; The closer the void location is from the arch foot,the more obvious the internal force growth is,the lower the structural safety; as the thickness of the voids increases,the structural safety gradually decreases,and the structural dangerous point is shifted from the arch foot to the void part; in the case of asymmetrical voiding,the non-vacuum side safety is smaller than the corresponding void-free side except for the proximity of the voided part. Therefore,the safety of the non-vacuumed side structure also needs attention.
引文
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[2]张顶立,张素磊,房倩,等.铁路运营隧道衬砌背后接触状态及其分析[J].岩石力学与工程学报,2013,32(2):217-224.
[3]王立川,周东伟,吴剑,等.铁路隧道复合衬砌脱空的危害分析与防治[J].中国铁道科学,2011,32(5):56-63.
[4] LIU Haijing,XIA Caichu,ZHU Hehua,et al. Study on Tunnel Damage[J]. Chinese journal of underground space and engineering,2007,3(5):947-953.
[5]代高飞,朱合华,夏才初.某公路隧道病害成因分析与治理研究[J].中国安全科学学报,2005,15(12):89.
[6]卢颖明,陈礼伟.既有隧道病害现象分类及原因分析[J].铁道建筑,2010(11):46-49.
[7]陈俊涛.围岩拱顶空洞对隧道稳定性影响规律研究[D].重庆:重庆交通大学,2012.
[8]应国刚.衬砌背后空洞对隧道结构体系安全性的影响机理研究[D].北京:北京交通大学,2016.
[9]李彬,雷明锋,李文华.运营公路隧道病害对衬砌结构安全性的影响[J].铁道科学与工程学报,2011,8(5):40-45.
[10]吕勇,潘雷.琯头岭隧道病害检测与衬砌安全性分析[J].新疆交通科技,2013(6):42-46.
[11]晏启祥,郑俊,刘记,等.条石衬砌公路隧道病害检测及安全性评估[J].公路,2010(6):228-233.
[12]丁浩,黑继伟,蔡爽.公路隧道欠厚二次衬砌的统计特征及其安全分析[J].地下空间与工程学报,2017,13(S1):349-352.
[13]谢高鸿.运营公路隧道结构安全性分析及病害整治技术研究[D].北京:北京交通大学,2012.
[14]中铁二院工程集团有限责任公司.铁路隧道设计规范:TB10003—2016[S].北京:中国铁道出版社,2016.