炸山嘴隧道围岩大变形特征及其控制措施
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摘要
强风化砂岩围岩自身承载能力弱,遇水后其强度迅速降低,发生围岩大变形的概率极大。该文以固西公路炸山嘴隧道工程为依托,通过现场监测,分析了强风化砂岩段围岩大变形的特点及其变形机理,并结合实际施工情况,提出了强风化砂岩围岩大变形的控制措施。得出在强风化砂岩段发生大变形的条件下,可通过施做临时刚护拱、临时仰拱以及临时支撑等加固补强措施,以稳住围岩变形;在强风化砂岩地区开挖隧道,应提高其支护体系的整体刚度,并在换拱时采用微型爆破、逐榀换拱等方法以减少对围岩的扰动,同时应及时施做仰拱和二次衬砌。所得结果为相似地质条件下隧道的施工提供借鉴。
The bearing capacity of strong weathered sandstone surrounding rock is weak,its strength decreases rapidly after encountering water,and the probability of large deformation of surrounding rock is extremely. The article relies on the Zhashanzui Tunnel of Guxi Road,through site monitor measurement,the characteristics and deformation mechanism of the large deformation of strong weathered sandstone surrounding rock are analyzed. Combined with the actual construction conditions,the control measures for large deformation of strongly weathered sandstone surrounding rock are put forward. It concludes that under large deformation conditions of strong weathered sandstone,the deformation of surrounding rock can be stabilized by reinforcement measures such as temporary rigid arch,temporary inverted arch and temporary support. The global stiffness of its supporting system should be improved when the tunnel is excavatied in strongly weathered sandstone area,the method of micro blasting and replacing the trusses to archstep one by one should be used to reduce the disturbance to surrounding rock,and the invert arch and secondary lining should be done in time. The results provide reference for tunnel construction under similar geological conditions.
The bearing capacity of strong weathered sandstone surrounding rock is weak,its strength decreases rapidly after encountering water,and the probability of large deformation of surrounding rock is extremely. The article relies on the Zhashanzui Tunnel of Guxi Road,through site monitor measurement,the characteristics and deformation mechanism of the large deformation of strong weathered sandstone surrounding rock are analyzed. Combined with the actual construction conditions,the control measures for large deformation of strongly weathered sandstone surrounding rock are put forward. It concludes that under large deformation conditions of strong weathered sandstone,the deformation of surrounding rock can be stabilized by reinforcement measures such as temporary rigid arch,temporary inverted arch and temporary support. The global stiffness of its supporting system should be improved when the tunnel is excavatied in strongly weathered sandstone area,the method of micro blasting and replacing the trusses to archstep one by one should be used to reduce the disturbance to surrounding rock,and the invert arch and secondary lining should be done in time. The results provide reference for tunnel construction under similar geological conditions.
引文
[1]周运祥.强风化砂岩地区浅埋偏压隧道病害分析及整治.铁道标准设计,2015,59(4):79~83
[2]李国良.兰渝铁路特殊复杂地质隧道建设难点及对策.现代隧道技术,2015,52(5):10~15
[3]王树栋.复杂地应力区隧道软弱围岩大变形控制技术研究:[学位论文].北京:北京交通大学,2010
[4]张青龙,李宁,曲星.富水软岩隧洞变形特征及变形机制分析.岩石力学与工程学报,2011,30(11):2196~2202
[5]吴广明.高地应力软岩大变形隧道施工技术.现代隧道技术,2012,49(4):94~97
[6]张文强,王庆林,李建伟,等.木寨岭隧道大变形控制技术术.隧道建设,2010,30(2):157~161
[7]刘高,张帆宇,李新召,等.木寨岭隧道大变形特征及机理分析.岩石力学与工程学报,2005,24(增2):5521~5526
[8]张文新,孙韶峰,刘虹.木寨岭隧道高地应力软岩大变形施工技术.现代隧道技术,2011,48(2):78~82
[9]来弘鹏,杨万精,谢永利.软岩大变形偏压公路隧道变形与荷载作用特征.中南大学学报(自然科学版),2014,45(6):1924~1931
[10]王军,李天斌,程强,等.G317线薛城隧道软岩大变形机制及处治措施研究.勘察科学技术,2018,(01):29~35
[11]赖金星,樊浩博,来弘鹏,等.软弱黄土隧道变形规律现场测试与分析.岩土力学,2015,36(7):2003~2020
[12]雷浩.黄土隧道深浅埋界定及区段地貌影响的结构受力特性研究:[学位论文].长安:长安大学,2012
[13]郭志.软岩力学特性研究.工程地质学报,1996,4(3):79~84
[14]赖金星,邱军领,牛方圆,等.浅埋偏压黄土隧道塌方处治及效果分析.现代隧道技术,2017,52(2):194~201
[15]孙洋,陈建平,余莉,等.浅埋偏压隧道软岩大变形机理及施工控制分析.现代隧道技术,2013,50(5):169~174
[2]李国良.兰渝铁路特殊复杂地质隧道建设难点及对策.现代隧道技术,2015,52(5):10~15
[3]王树栋.复杂地应力区隧道软弱围岩大变形控制技术研究:[学位论文].北京:北京交通大学,2010
[4]张青龙,李宁,曲星.富水软岩隧洞变形特征及变形机制分析.岩石力学与工程学报,2011,30(11):2196~2202
[5]吴广明.高地应力软岩大变形隧道施工技术.现代隧道技术,2012,49(4):94~97
[6]张文强,王庆林,李建伟,等.木寨岭隧道大变形控制技术术.隧道建设,2010,30(2):157~161
[7]刘高,张帆宇,李新召,等.木寨岭隧道大变形特征及机理分析.岩石力学与工程学报,2005,24(增2):5521~5526
[8]张文新,孙韶峰,刘虹.木寨岭隧道高地应力软岩大变形施工技术.现代隧道技术,2011,48(2):78~82
[9]来弘鹏,杨万精,谢永利.软岩大变形偏压公路隧道变形与荷载作用特征.中南大学学报(自然科学版),2014,45(6):1924~1931
[10]王军,李天斌,程强,等.G317线薛城隧道软岩大变形机制及处治措施研究.勘察科学技术,2018,(01):29~35
[11]赖金星,樊浩博,来弘鹏,等.软弱黄土隧道变形规律现场测试与分析.岩土力学,2015,36(7):2003~2020
[12]雷浩.黄土隧道深浅埋界定及区段地貌影响的结构受力特性研究:[学位论文].长安:长安大学,2012
[13]郭志.软岩力学特性研究.工程地质学报,1996,4(3):79~84
[14]赖金星,邱军领,牛方圆,等.浅埋偏压黄土隧道塌方处治及效果分析.现代隧道技术,2017,52(2):194~201
[15]孙洋,陈建平,余莉,等.浅埋偏压隧道软岩大变形机理及施工控制分析.现代隧道技术,2013,50(5):169~174