米仓山隧道联络风道支护设计优化
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摘要
为了降低米仓山地下风机房联络风道施工难度,加快施工进度,通过广泛调研国内外资料,提出取消二次衬砌的支护优化方案,并采用大型数值计算软件对联络风道施工过程进行了模拟,重点分析了联络风道开挖之后围岩的位移和应力变化,以及支护结构的受力情况及偏心距,论证了联络风道取消二衬的可能性。结果表明,在隧址区围岩较好时,可以进行喷锚支护并取消二次衬砌,同时增加原有设计的喷射混凝土厚度,提高喷射混凝土强度。
In order to reduce the construction difficulty and speed up the construction progress of the connecting duct of the underground fan house in Micang Mountain,through extensive investigation of domestic and foreign data,the support optimization scheme of cancelling the secondary lining was put forward,and the construction process of the connecting duct was simulated by using large-scale numerical calculation software.The displacement and stress changes of the surrounding rock after the excavation of the connecting duct as well as the force condition and eccentricity of the support structure were analyzed.The possibility of cancelling the second lining of the connecting duct was demonstrated.The results show that when the surrounding rock of the tunnel site is steady,shotcrete-anchor support can be adopted and the secondary lining can be cancelled,and the original design of shotcrete thickness can be strengthened,and the strength of shotcrete can be improved.
In order to reduce the construction difficulty and speed up the construction progress of the connecting duct of the underground fan house in Micang Mountain,through extensive investigation of domestic and foreign data,the support optimization scheme of cancelling the secondary lining was put forward,and the construction process of the connecting duct was simulated by using large-scale numerical calculation software.The displacement and stress changes of the surrounding rock after the excavation of the connecting duct as well as the force condition and eccentricity of the support structure were analyzed.The possibility of cancelling the second lining of the connecting duct was demonstrated.The results show that when the surrounding rock of the tunnel site is steady,shotcrete-anchor support can be adopted and the secondary lining can be cancelled,and the original design of shotcrete thickness can be strengthened,and the strength of shotcrete can be improved.
引文
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[2]张磊.高速公路隧道地下风机房设计方法研究[D].成都:西南交通大学,2011
[3]梁桥欣.特长公路隧道空间交叉结构及地下洞群施工力学特征研究[D].成都:西南交通大学,2013.
[4]方勇,符亚鹏,周超月,等.公路隧道下穿双层采空区开挖过程模型试验[J].岩石力学与工程学报,2014,33(11):2247-2257.
[5]翟正平.宝塔山隧道地下风机房设计与调整[J].现代隧道技术,2012(5):99-103.
[6]方勇,汪辉武,周超月,等.隧道掌子面前方小型有压溶腔对围岩稳定性影响分析[J].湖南大学学报(自然科学版),2017,44(9):137-145.
[7]郝志荣,丁小平,王联,等.六盘山特长公路隧道1#斜井及地下风机房优化方案[J].公路交通科技(应用技术版),2016,12(12):101-103.
[8]郭永军.公路隧道地下风机房洞室群施工技术[J].山西交通科技,2014(3):81-83
[9]关宝树.漫谈矿山法隧道技术第九讲:隧道开挖和支护的方法[J].隧道建设,2016,36(7):6-16.
[10] TOMAS FRANZENA,K F.GARSHOLB,N.TOMISAWAC.Sprayed Concrete for Final Linings:ITA Working Group Report[J].Tunnelling and Underground Space Technology,2001(16):295-309.
[11]张俊儒,仇文革.隧道单层衬砌研究现状及评述[J].地下空间与工程学报,2006,2(4):693-699.
[12]奚家米,杨更社,冯钢.锚喷支护隧道围岩稳定可靠度分析[J].筑路机械与施工机械化,2008,25(9):68-70.
[13]王红英.隧道单层衬砌结构数值模拟研究[D].北京:中国科学院,2010.
[14]吴瑞国.公路隧道围岩稳定性和单层衬砌力学机理的数值模拟研究[D].成都:西南交通大学,2008.
[15]赵德安,雷晓燕,SWOBODAG.单、双层衬砌隧道的非线性有限元分析[J].中国公路学报,2003,26(1):62-67.
[16]赵玉成,贾晓旭.某软弱围岩隧道不同施工方法力学行为分析[J].筑路机械与施工机械化,2016,33(9):80-85.