地裂缝环境下马蹄形地铁隧道与土体相互作用的研究
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摘要
以穿越地裂缝带的西安地铁2号线为研究背景,通过数值模拟对地裂缝作用下马蹄形地铁隧道与土体相互作用的机理进行了研究。研究结果表明:随着上、下盘位错量的增加,地裂缝处受影响的土体范围逐渐增大,土体的竖向位移也逐渐变大;上盘下降过程中,下盘隧道顶部沉降变形最大,上盘隧道顶部沉降变形最小;隧道的变形区域出现在预设地裂缝两侧,并且随着竖向位错的增大而增大,当错距d=100mm时,地裂缝处的隧道结构发生破坏。隧道的最大主应力位于结构出现裂缝和受剪切破坏的区域,随着位错量的增加,隧道的最大主应力变化剧烈。地裂缝处,隧道结构上部靠下盘区域受拉,靠上盘区域受压,隧道结构下部靠下盘区域受压,靠上盘区域受拉。在实际工程中,地铁隧道穿越地裂缝时,宜采用分段式隧道结构。
The Metro Line 2 in Xi'an running across the ground fissures is taken as a research background, and the interaction between soil and U-shaped metro tunnel is studied by numerical simulation in the environment of ground fissures.The results show that the soil mass area is influenced by ground fissures and the vertical displacement gradually increases with the relative displacement increasing.When the hanging wall descends,the settlement deformation of footwall is maximum,and that of the hanging wall is minimum. The deformation area of tunnel lies on the two sides of presupposed ground fissure,and the area is enlarged with vertical relative displacement increasing.The tunnel structure damages at the ground fissures, when the relative displacement reaches 100 mm.The major principal stresses of tunnel are in the area of structure crack and shear failure.The major principal stresses of tunnel vary acutely.The footwall part is in tension and the hanging wall part is under pressure on the top of tunnel structure at the ground fissure.The footwall part is under pressure and the hanging wall part is in tension on the bottom of tunnel structure at the ground fissure.In the practical projects,the sectional type tunnel should be employed when the metro tunnel running across the ground fissures.
The Metro Line 2 in Xi'an running across the ground fissures is taken as a research background, and the interaction between soil and U-shaped metro tunnel is studied by numerical simulation in the environment of ground fissures.The results show that the soil mass area is influenced by ground fissures and the vertical displacement gradually increases with the relative displacement increasing.When the hanging wall descends,the settlement deformation of footwall is maximum,and that of the hanging wall is minimum. The deformation area of tunnel lies on the two sides of presupposed ground fissure,and the area is enlarged with vertical relative displacement increasing.The tunnel structure damages at the ground fissures, when the relative displacement reaches 100 mm.The major principal stresses of tunnel are in the area of structure crack and shear failure.The major principal stresses of tunnel vary acutely.The footwall part is in tension and the hanging wall part is under pressure on the top of tunnel structure at the ground fissure.The footwall part is under pressure and the hanging wall part is in tension on the bottom of tunnel structure at the ground fissure.In the practical projects,the sectional type tunnel should be employed when the metro tunnel running across the ground fissures.
引文
[1]黄强兵,彭建兵,范文.西安地铁二号线沿线地裂缝未来位错量估算及工程分级[J],工程地质学报,2007, 15(4):469-474. Huang Q B,Peng J B,Fan W.Estimation of the maximum displacement of ground fissures along Xi'an metro line 2 and its engineering classification[J]. ??Journal of Engineering Geology,2007,15(4):469- 474.
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[7]胡志平,彭建兵,王启耀,等.盾构隧道60°斜穿地裂缝的变形破坏机制试验研究[J].岩石力学与工程学报, 2010,29(1):176-183. Hu Z P,Peng J B,Wang Q Y,et al.Modeling test research on failure mechanism of shield tunnel crossing ground fissure with 60°[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(1):176- 183.
[8]黄强兵,彭建兵,高虎艳,等.地铁隧道斜交穿越地裂缝带的纵向设防长度[J].铁道学报,2010,32(1):73- 78. Huang Q B,Pend J B,Gao H Y,et al.The longitudinal fortified length of metro tunnel obliquely crossing the active ground fissure zones[J].Journal of the China Railway Society,2010,32(1):73-78.
[9]石玉玲,门玉明,彭建兵,等.西安城区地裂缝破裂扩展的数值模拟[J].水文地质工程地质学报,2008,(6): 56-60. Shi Y L,Men Y M,Peng J B,et al.Numerical simulation of ground-fissure cracking and extending in ??Xi'an[J].Hydrogeology & Engineering Geology, 2008,(6):56-60.
[10]刘妮娜,门玉明,刘洋,等.地震动力作用下土-地铁隧道模型分析[J].地球科学与环境学报,2009,31(4): 295-298. Liu N N,Men Y M,Liu Y,et al.Model test of soil and metro-tunnels interaction in earthquake activities [J].Journal of Earth Sciences and Environment, 2009,31(4):295-298.
[2]黄强兵,彭建兵,门玉明,等.地裂缝对地铁明挖整体式衬砌隧道影响机制的模型试验研究[J].岩石力学与工程学报,2008,27(11):2324-2331. Huang Q B,Peng J B,Men Y M,et al.Model test study on effect of ground fissure on open-cut metro tunnel with integral lining[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(11): 2324-2331.
[3]李凯玲,张亚,刘妮娜.土-地铁隧道动力相互作用模型试验分析[J].工程地质学报,2007,15(4):534- 538 Li K L,Zhang Y,Liu N N.Model test of soil-metro tunnel dynamic interaction[J].Journal of Engineering Geology,2007,15(4):534-538
[4]黄强兵,彭建兵,石玉玲,等.地裂缝活动对地铁区间隧道地层应力与位移影响的试验研究[J].岩土工程学报,2009,31(10):1525-1532. Huang Q B,Peng J B,Shi Y L,et al.Experimental study on effect of active ground fissures on stress and displacement change laws of strata near metro tunnels [J].Chinese Journal of Geotechnical Engineering, 2009,31(10):1525-1532.
[5]刘妮娜,门玉明,彭建兵,等.地震荷载作用下地铁盾构隧道动力响应分析[J].水文地质工程地质,2010,37 (4):58-62. Liu N N,Men Y M,Peng J B,et al.Dynamic response of shield metro tunnel in earthquake load[J]. Hydrogeology & Engineering Geology,2010,37(4): 58-62.
[6]范文,熊炜,彭建兵,等.分段式地铁隧道穿越地裂缝带的模型试验研究[J].岩土工程学报,2010,32(1): 138-143. Fan W,Xiong W,Peng J B,et al.Model tests on segmental subway tunnel crossing ground fissure belt [J].Chinese Journal of Geotechnical Engineering, 2010,32(1):138-143.
[7]胡志平,彭建兵,王启耀,等.盾构隧道60°斜穿地裂缝的变形破坏机制试验研究[J].岩石力学与工程学报, 2010,29(1):176-183. Hu Z P,Peng J B,Wang Q Y,et al.Modeling test research on failure mechanism of shield tunnel crossing ground fissure with 60°[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(1):176- 183.
[8]黄强兵,彭建兵,高虎艳,等.地铁隧道斜交穿越地裂缝带的纵向设防长度[J].铁道学报,2010,32(1):73- 78. Huang Q B,Pend J B,Gao H Y,et al.The longitudinal fortified length of metro tunnel obliquely crossing the active ground fissure zones[J].Journal of the China Railway Society,2010,32(1):73-78.
[9]石玉玲,门玉明,彭建兵,等.西安城区地裂缝破裂扩展的数值模拟[J].水文地质工程地质学报,2008,(6): 56-60. Shi Y L,Men Y M,Peng J B,et al.Numerical simulation of ground-fissure cracking and extending in ??Xi'an[J].Hydrogeology & Engineering Geology, 2008,(6):56-60.
[10]刘妮娜,门玉明,刘洋,等.地震动力作用下土-地铁隧道模型分析[J].地球科学与环境学报,2009,31(4): 295-298. Liu N N,Men Y M,Liu Y,et al.Model test of soil and metro-tunnels interaction in earthquake activities [J].Journal of Earth Sciences and Environment, 2009,31(4):295-298.
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