分离式隧道扩建成小净距隧道群爆破震动控制研究
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摘要
双洞分离式隧道扩建成四洞小净距隧道群的施工必须保证原隧道衬砌结构和新建隧道与原隧道之间中夹岩的稳定。运用三维有限元动力分析方法,对分离式隧道扩建成小净距隧道群的施工过程中原隧道衬砌结构爆破动力响应特性进行分析。根据原隧道衬砌结构最大平均有效应力特征得到了Ⅳ级、V级围岩隧道在不同施工方式条件下的原隧道衬砌结构的最大爆破震动控制速度和控制药量,为隧道扩建设计和安全施工提供了依据。
In the construction that double track separated tunnels extends to four track tunnels group with small clear distance,the stability of the original tunnel lining structure and the interlaid rock between the new and the original tunnel should be must guaranteed.Using three-dimensional finite element method,the blasting dynamic characterstic of the original tunnel lining structure in the construction process that the separated tunnel extends to the small clear distance tunnel group is analyzed.According to the original tunnel liniing structure characteristic of the maximum average effective stress,the biggest blasting vibration control speed and dose of class IV and V surrounding rock tunnel under the condition of different construction mode are given.The basis for entension design and the safety construction of the tunnel are provided.
In the construction that double track separated tunnels extends to four track tunnels group with small clear distance,the stability of the original tunnel lining structure and the interlaid rock between the new and the original tunnel should be must guaranteed.Using three-dimensional finite element method,the blasting dynamic characterstic of the original tunnel lining structure in the construction process that the separated tunnel extends to the small clear distance tunnel group is analyzed.According to the original tunnel liniing structure characteristic of the maximum average effective stress,the biggest blasting vibration control speed and dose of class IV and V surrounding rock tunnel under the condition of different construction mode are given.The basis for entension design and the safety construction of the tunnel are provided.
引文
[1]响亮.城市浅埋硬岩大跨隧道开挖爆破震动监控研究[D].成都:西南交通大学,2006.
[2]阳生权.小线间距施工隧道爆破地震影响下既有隧道围岩线性动力分析[J].工程爆破,1998,4(1):1-6.
[3]刘慧.近距侧爆情况下马蹄形隧道动态响应特点的研究[J].爆炸与冲击,2000,20(2):175-179.
[4]谭忠盛,杨小林,王梦恕.复线隧道施工爆破对既有隧道的影响分析[J].岩石力学与工程学报,2003,22(2):281-285.
[5]马怀发,陈厚群,黎保琨.预静载作用下混凝土梁的动弯拉强度[J].中国水利水电科学研究院学报,2005,03(3):168-172.
[6]王明年,潘晓马,张成满,等.邻近隧道爆破震动响应研究[J].岩土力学,2004,25(3):412-414.
[7]时亚昕,王明年,李强.爆破震动对双连拱隧道中墙的影响分析[J].岩土力学,2007,28(6):1 275-1 279.
[8]JTG D70—2004,公路隧道设计规范[S].北京:人民交通出版社,2004.
[2]阳生权.小线间距施工隧道爆破地震影响下既有隧道围岩线性动力分析[J].工程爆破,1998,4(1):1-6.
[3]刘慧.近距侧爆情况下马蹄形隧道动态响应特点的研究[J].爆炸与冲击,2000,20(2):175-179.
[4]谭忠盛,杨小林,王梦恕.复线隧道施工爆破对既有隧道的影响分析[J].岩石力学与工程学报,2003,22(2):281-285.
[5]马怀发,陈厚群,黎保琨.预静载作用下混凝土梁的动弯拉强度[J].中国水利水电科学研究院学报,2005,03(3):168-172.
[6]王明年,潘晓马,张成满,等.邻近隧道爆破震动响应研究[J].岩土力学,2004,25(3):412-414.
[7]时亚昕,王明年,李强.爆破震动对双连拱隧道中墙的影响分析[J].岩土力学,2007,28(6):1 275-1 279.
[8]JTG D70—2004,公路隧道设计规范[S].北京:人民交通出版社,2004.
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