盾构隧道正交下穿施工对既有隧道影响的模型试验与数值模拟
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摘要
在城市地铁工程中,经常出现新建隧道施工近接既有隧道的情况,包括隧道水平、竖直和倾斜平行以及上下正交和斜交等,新隧道的掘进不可避免地对既有隧道产生影响。本文针对盾构法新建正交下穿隧道,以广州地铁3号线大塘-沥滘区间盾构隧道为背景,采用室内相似模型试验和三维有限元数值计算相结合的手段,引入横向和纵向等效刚度折减系数,对盾构隧道正交下穿施工所引起的既有隧道纵向变位、纵向附加轴力和弯矩、横向变形、横向附加轴力和弯矩进行深入研究,得到围岩条件、隧道净距、顶推力等因素作用下盾构隧道正交下穿施工所引起的既有隧道的变形和附加内力分布变化规律。
In urban metro construction there often occurs the situation when newly-built tunnels pass adjacent to existing tunnels,including horizontal,vertical & inclined parallel tunnels,perpendicular overcross & undercross tunnels and inclined cross tunnels.Tunneling of the new tunnels has an inevitable impact on the existing tunnels.Against the background of the construction of the Datang-Lijiao section shield tunnel of Guangzhou Metro Line 3,and introducing in the lateral and longitudinal equivalent stiffness coefficients,the longitudinal displacement,longitudinal additional axis force & moment,lateral deformation,lateral additional axis force & moment of the existing tunnel induced by perpendicular undercross shield tunnel construction are studied by means of the laboratory similar model test and 3D FEM computation.The factors such as the surrounding soil,clear distance and advance force etc and their influence on the laws of distribution of the mentioned deformations and additional internal forces in perpendicular undercross shield tunneling are also discussed.
In urban metro construction there often occurs the situation when newly-built tunnels pass adjacent to existing tunnels,including horizontal,vertical & inclined parallel tunnels,perpendicular overcross & undercross tunnels and inclined cross tunnels.Tunneling of the new tunnels has an inevitable impact on the existing tunnels.Against the background of the construction of the Datang-Lijiao section shield tunnel of Guangzhou Metro Line 3,and introducing in the lateral and longitudinal equivalent stiffness coefficients,the longitudinal displacement,longitudinal additional axis force & moment,lateral deformation,lateral additional axis force & moment of the existing tunnel induced by perpendicular undercross shield tunnel construction are studied by means of the laboratory similar model test and 3D FEM computation.The factors such as the surrounding soil,clear distance and advance force etc and their influence on the laws of distribution of the mentioned deformations and additional internal forces in perpendicular undercross shield tunneling are also discussed.
引文
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[3]日本土木学会.トンネル標準示方(シ■ルド工法編).同解説[M].東京:日本土木学会,1997:79-81.
[4]袁文忠.相似理论与静力学模型试验[M].成都:西南交通大学出版社,1998.
[5]黄宏伟,臧小龙.盾构隧道纵向变形性态研究分析[J].地下空间,2002,22(3):244-251.HUANG Hong-wei,ZANG Xiao-long.Research and A-nalysis on Longitudinal Deformation Characteristics ofShield Tunnel[J].Underground Space,2002,22(3):244-251.
[6]鉄道総合技術研究所.鉄道構造物等設計標準.同解説(シ■ルドトンネル)[M].東京:丸善株式会社,1997.
[7]何川.シ■ルドトンネル縦断方向の地震■動に関する研究[D].東京:早稲田大学,1999.
[8]孙训方,胡增强等.材料力学(上册)[M].北京:高等教育出版社,2000.
[9]中华人民共和国国家标准.GB50157—2003地铁设计规范[S].北京:中国计划出版社,2003.
[10]シ■ルド工法の調査.設計から施工まで編集委員会.シ■ルド工法の調査.設計から施工まで[M].東京:地盤工学会,1997.
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