地铁隧道斜交穿越地裂缝带的纵向设防长度
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摘要
以西安地铁1号线斜交穿越地裂缝带为工程背景,通过地裂缝活动的大型物理模型试验和有限元数值模拟,对西安地裂缝活动的影响范围和西安地铁1号线隧道穿越地裂缝带的纵向设防长度进行研究。结果表明:地裂缝活动时引起其上盘地层中出现应力降低和下盘地层中出现应力增强现象,且在垂直于地裂缝走向上其两侧地层中应力变化大致呈现出反对称分布特征。隧道设计埋深处地裂缝活动的影响区宽度为30 m,即上盘17.5m,下盘12.5 m;考虑安全系数时地铁隧道穿越地裂缝带的设防宽度为55 m,即上盘35 m,下盘20 m。根据地铁隧道与地裂缝带的斜交夹角,确定地铁区间隧道不同夹角斜交穿越地裂缝带的纵向设防长度。研究结果对西安地铁1号线区间隧道斜穿地裂缝带的结构处理及设计具有一定参考价值。
Through a large-scale physical model test of ground fissures movement and FEM numerical simulation against the engineering background of Xi'an Metro Line No.1 obliquely intersecting active ground fissure zones,the influential zone of active ground fissures and designed longitudinal fortified length of the metro tunnel obliquely crossing the active ground fissure zones were studied.The results show as follows: Soil stress reducing appears in strata of the hanging wall of the ground fissure and soil stress intensifying appears in the footwall of the ground fissure,approximate anti-symmetric distribution of soil stresses appears on both sides of the ground fissure;the influential zone of active ground fissure is 30 m wide,i.e.,17.5 m in the hanging wall and 12.5 m in the footwall of the ground fissure;considering the safety factor and active characteristics of the ground fissure,the suggested fortified width in design of the metro tunnel crossing the active ground fissure zone is 55 m,i.e.,35 m in the hanging wall and 20 m in the footwall of the ground fissure;the longitudinal lengths of different sections of Xi'an Metro Line No.1 obliquely crossing active ground fissure zones are calculated according to different intersecting angles between the metro tunnel and the active ground fissures.The conclusions provide reference for the structural treatment and design of Xi'an Metro Line No.1 which obliquely crosses active ground fissure zones.
Through a large-scale physical model test of ground fissures movement and FEM numerical simulation against the engineering background of Xi'an Metro Line No.1 obliquely intersecting active ground fissure zones,the influential zone of active ground fissures and designed longitudinal fortified length of the metro tunnel obliquely crossing the active ground fissure zones were studied.The results show as follows: Soil stress reducing appears in strata of the hanging wall of the ground fissure and soil stress intensifying appears in the footwall of the ground fissure,approximate anti-symmetric distribution of soil stresses appears on both sides of the ground fissure;the influential zone of active ground fissure is 30 m wide,i.e.,17.5 m in the hanging wall and 12.5 m in the footwall of the ground fissure;considering the safety factor and active characteristics of the ground fissure,the suggested fortified width in design of the metro tunnel crossing the active ground fissure zone is 55 m,i.e.,35 m in the hanging wall and 20 m in the footwall of the ground fissure;the longitudinal lengths of different sections of Xi'an Metro Line No.1 obliquely crossing active ground fissure zones are calculated according to different intersecting angles between the metro tunnel and the active ground fissures.The conclusions provide reference for the structural treatment and design of Xi'an Metro Line No.1 which obliquely crosses active ground fissure zones.
引文
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[10]张家明.西安地裂缝研究[M].西安:西北大学出版社,1990.
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[13]Pen J B,Sun P,Li X An.Ground Fissure:the Major Ge-ological and Environmental Problem in the Development ofXi’an City.China[C]//STARRETT S K,HQNG J H,LYON W G,et al.Environmental Science and Technolo-gy(vol.2).Houston,USA:American Science Press,2006:469-474.
[14]彭建兵,陈立伟,黄强兵,等.地裂缝破裂扩展的大型物理模拟试验研究[J].地球物理学报,2008,51(6):1826-1834.PENG Jian-bing,CHEN Li-wei,HUANG Qiang-bing,etal.Large-scale Physical Simulative Experiment on GroundFissure Expanison Mechnism[J].Chinese Journal of Geo-physics,2008,51(6):1826-1834.
[15]黄强兵,彭建兵,闫金凯,等.地裂缝活动对土体应力与变形影响的试验研究[J].岩土力学,2009,30(4):903-908.HUANG Qiang-bing,PENG Jian-bing,YAN Jin-kai,etal.Model Test Study of Influence of Ground FissureMovement on Stress and Deformation of Soil Mass[J].Rock and Soil Mechanics,2009,30(4):903-908.
[16]中华人民共和国国家质量监督检验检疫总局,中华人民共和国建设部.GB 50157-2003地铁设计规范[S].北京:中国计划出版社,2003.
[2]黄强兵,彭建兵,樊红卫,等.西安地裂缝对地铁隧道的危害及防治措施研究[J].岩土工程学报,2009,31(5):781-788.HUANG Qiang-bing,PENG Jian-bing,FAN Hong-wei,et al.Metro Tunnel Hazards Induced by Active GroundFissures in Xi’an and Relevant Control Measures[J].Chi-nese Journal of Geotechnical Engineering,2009,31(5):781-788.
[3]黄强兵,彭建兵,门玉明,等.地裂缝对地铁明挖整体式衬砌隧道影响机制的模型试验研究[J].岩石力学与工程学报,2008,27(11):2324-2331.HUANG Qiang-bing,PENG Jian-bing,MEN Yu-ming,etal.Model Test Study on Effect of Ground Fissure on Open-cut Metro Tunnel with Integral Lining[J].Chinese Journalof Rock Mechanics and Engineering,2008,27(11):2324-2331.
[4]陕西省建设厅.DBJ 61-6-2006西安地裂缝场地勘察与工程设计规程[S].西安:陕西省建设厅,2006.
[5]王景明,等.地裂缝及其灾害的理论与应用[M].西安:陕西科学技术出版社,2000.
[6]毛应生,柳丽英,王德信,等.西安市地裂对市政构筑物的破坏机理与对策的探讨[J].城市道桥与防洪,2002,(2):1-6.MAO Ying-sheng,LIU Li-ying,WANG De-xin,et al.Ap-proach to Mechanism and Countermeasure of MunicipalStructures Destroyed by Ground Cracking in Xi’an City[J].Urban Roads Bridges&Flood Control,2002,(2):1-6.
[7]尹光伟.地裂缝活动对燃气管道的破坏及采取的措施[J].天然气与石油,2003,21(1):1-4.YIN Guang-wei.The Damage of Earth Crack Activities toFuel Gas Pipelines and Prevention Measures[J].Oil&GasTransportation and Storage,2003,21(1):1-4.
[8]刘嘉斌,马跟良,苏岗,等.燃气管道穿越地裂缝的处理[J].煤气与热力,2002,22(3):224-226.LIU Jia-bin,MA Gen-liang,SU Gang,et al.Treatmentfor Gas Pipeline Crossing Ground Fracture[J].Gas&Heat,2002,22(3):224-226.
[9]马广超.西安地裂缝对地下排水管道的破坏及防治[J].灾害学,2005,20(3):108-111.MA Guang-chao.The Damage to Underground DrainagePipelines Caused by Ground Fissures in Xi’an[J].Journalof Catastro-phology,2005,20(3):108-111.
[10]张家明.西安地裂缝研究[M].西安:西北大学出版社,1990.
[11]彭建兵,等.渭河盆地活动断裂与地质灾害[M].西安:西北大学出版社,1992.
[12]李永善,等.西安地裂缝及渭河盆地活断层研究[M].北京:地震出版社,1992.
[13]Pen J B,Sun P,Li X An.Ground Fissure:the Major Ge-ological and Environmental Problem in the Development ofXi’an City.China[C]//STARRETT S K,HQNG J H,LYON W G,et al.Environmental Science and Technolo-gy(vol.2).Houston,USA:American Science Press,2006:469-474.
[14]彭建兵,陈立伟,黄强兵,等.地裂缝破裂扩展的大型物理模拟试验研究[J].地球物理学报,2008,51(6):1826-1834.PENG Jian-bing,CHEN Li-wei,HUANG Qiang-bing,etal.Large-scale Physical Simulative Experiment on GroundFissure Expanison Mechnism[J].Chinese Journal of Geo-physics,2008,51(6):1826-1834.
[15]黄强兵,彭建兵,闫金凯,等.地裂缝活动对土体应力与变形影响的试验研究[J].岩土力学,2009,30(4):903-908.HUANG Qiang-bing,PENG Jian-bing,YAN Jin-kai,etal.Model Test Study of Influence of Ground FissureMovement on Stress and Deformation of Soil Mass[J].Rock and Soil Mechanics,2009,30(4):903-908.
[16]中华人民共和国国家质量监督检验检疫总局,中华人民共和国建设部.GB 50157-2003地铁设计规范[S].北京:中国计划出版社,2003.
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