近距离平行盾构隧道施工引起的土体沉降位移规律研究
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摘要
以广州地铁9号线4标段马莲盾构隧道施工为例,利用Plaxis 3D Tunnel有限元分析软件分析了近距离平行盾构隧道施工引起的地面沉降规律。研究结果表明:右线单线穿越时,地面沉降呈正态分布,水平位移呈"蝶形"分布;双线穿越时,地面沉降呈"W"型分布,水平位移的分布是单个隧道施工产生的水平位移的叠加;随着地层损失率的增加,右线单线穿越时的最大沉降量和沉降范围均不断增大。在右线隧道体积损失率一定时,随着左线隧道体积损失率的增大,沉降槽中线逐渐接近左线隧道的轴线位置,沉降槽最大沉降量出现位置也随之移动。现场监测数据验证了模拟结果的准确性,也说明马莲盾构隧道右线地层损失率为2. 5%,左线地层损失率为2. 4%。
With the 4th section of Malian shield tunnel on Guangzhou Metro Line 9 as an example,the land subsidence law caused by the adjacent construction of parallel shield tunnel is analyzed by using Plaxis 3D Tunnel finite element analysis software. The results show that the land subsidence is normally distributed and the horizontal displacement is distributed in a "butterfly pattern" when the right line passes alone; in the case of double lines,the distribution of the land subsidence is in a "W" pattern,the distribution of the horizontal displacement is the superposition of horizontal displacement generated by a single tunnel construction. With the increase of the layer loss rate,the maximum settlement and settlement range are increasing when the right line passes alone. When the layer loss rate of the right tunnel remains still,the central line of settling tank gradually approaches the axis position of the left tunnel,and the position where the maximum settlement of the settling tank appears will move with the increase of the layer loss rate of the left tunnel. The field monitoring data have verified the accuracy of the simulation results,indicating that the layer loss rate of the right line of Malian shield tunnel is 2.5%,and that of the left line is 2.4%.
With the 4th section of Malian shield tunnel on Guangzhou Metro Line 9 as an example,the land subsidence law caused by the adjacent construction of parallel shield tunnel is analyzed by using Plaxis 3D Tunnel finite element analysis software. The results show that the land subsidence is normally distributed and the horizontal displacement is distributed in a "butterfly pattern" when the right line passes alone; in the case of double lines,the distribution of the land subsidence is in a "W" pattern,the distribution of the horizontal displacement is the superposition of horizontal displacement generated by a single tunnel construction. With the increase of the layer loss rate,the maximum settlement and settlement range are increasing when the right line passes alone. When the layer loss rate of the right tunnel remains still,the central line of settling tank gradually approaches the axis position of the left tunnel,and the position where the maximum settlement of the settling tank appears will move with the increase of the layer loss rate of the left tunnel. The field monitoring data have verified the accuracy of the simulation results,indicating that the layer loss rate of the right line of Malian shield tunnel is 2.5%,and that of the left line is 2.4%.
引文
[1] PECK R B. Deep excavations and tunneling in soft ground[C]//State of the Art Reports. 7th International Conference on Soil M echanics and Foundation Engineering. M exico:SM FE,1969:225.
[2]马可栓.盾构施工引起地基移动与近邻建筑保护研究[D].武汉:华中科技大学,2008.
[3]陈春来,赵城丽,魏纲,等.基于Peck公式的双线盾构引起的土体沉降预测[J].岩土力学,2014,35(8):2212.
[4]邱明明,杨果林,吴镇清,等.双孔平行地铁隧道盾构施工地表沉降分布规律研究[J].现代隧道技术,2017,54(2):96.
[5]胡斌,刘永林,唐辉明,等.武汉地铁虎泉—名都区间隧道开挖引起的地表沉降研究[J].岩石力学与工程学报,2012,31(5):908.
[6]谷拴成,李敏.西安地铁盾构施工地表沉降随机介质预测研究[J].铁道工程学报,2014,31(3):110.
[7]王立忠,吕学金.复变函数分析盾构隧道施工引起的地基变形[J].岩土工程学报,2007,29(3):319.
[8]苏锋,陈福全,施有志.深埋双隧洞开挖的解析延拓法求解[J].岩石力学与工程学报,2012,31(2):365.
[9]糜瑞杰,杨双锁,鲍飞翔,等.双线盾构隧道断面及相对空间位置对地表沉降的影响[J].太原理工大学学报,2018,49(3):438.
[10]黄文君,郑明新,欧阳林,等.盾构施工工艺对铁路路基沉降影响的数值分析[J].隧道建设,2015,35(2):128.
[11]詹涛.双线盾构隧道小净距下穿时既有隧道结构的变形数值分析[J].城市轨道交通研究,2015(11):23.
[12]潘宇平,倪静,李林,等.基于LIB-SVM的盾构隧道地表沉降预测方法研究[J].水资源与水工程学报,2018,29(3):231.
[2]马可栓.盾构施工引起地基移动与近邻建筑保护研究[D].武汉:华中科技大学,2008.
[3]陈春来,赵城丽,魏纲,等.基于Peck公式的双线盾构引起的土体沉降预测[J].岩土力学,2014,35(8):2212.
[4]邱明明,杨果林,吴镇清,等.双孔平行地铁隧道盾构施工地表沉降分布规律研究[J].现代隧道技术,2017,54(2):96.
[5]胡斌,刘永林,唐辉明,等.武汉地铁虎泉—名都区间隧道开挖引起的地表沉降研究[J].岩石力学与工程学报,2012,31(5):908.
[6]谷拴成,李敏.西安地铁盾构施工地表沉降随机介质预测研究[J].铁道工程学报,2014,31(3):110.
[7]王立忠,吕学金.复变函数分析盾构隧道施工引起的地基变形[J].岩土工程学报,2007,29(3):319.
[8]苏锋,陈福全,施有志.深埋双隧洞开挖的解析延拓法求解[J].岩石力学与工程学报,2012,31(2):365.
[9]糜瑞杰,杨双锁,鲍飞翔,等.双线盾构隧道断面及相对空间位置对地表沉降的影响[J].太原理工大学学报,2018,49(3):438.
[10]黄文君,郑明新,欧阳林,等.盾构施工工艺对铁路路基沉降影响的数值分析[J].隧道建设,2015,35(2):128.
[11]詹涛.双线盾构隧道小净距下穿时既有隧道结构的变形数值分析[J].城市轨道交通研究,2015(11):23.
[12]潘宇平,倪静,李林,等.基于LIB-SVM的盾构隧道地表沉降预测方法研究[J].水资源与水工程学报,2018,29(3):231.