地震作用下浅埋隧道动态稳定性的拟静力上限分析
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摘要
考虑非偏压与偏压2种情况,从能量的角度出发,采用拟静力法研究水平地震力与竖直地震力对浅埋隧道稳定性的影响。研究结果表明:在静态条件下,由本文极限分析法计算所得的结果非常接近于由极限平衡法计算所得结果,验证了本文方法的正确性;在参数分析中,随着侧压力比例系数的增加,竖直方向的围岩压力减小,水平方向的围岩压力增大,破裂角呈减小的趋势,而偏压对浅埋隧道的稳定性也有一定影响,但侧压力比例系数的影响更大;在采用拟静力法进行动态稳定性分析时,水平地震效应系数增加,浅埋隧道的围岩压力与破裂角增大;当竖直地震效应比例系数增加时,浅埋隧道的围岩压力增大,破裂角却减小,且效果明显,可见竖直地震力与水平地震力一样,对浅埋隧道的稳定性有较大影响,在进行支护设计时不容忽略。
Based on two cases of non-bias and bias, from the view of energy, the influence on stability of shallow tunnels from horizontal and vertical earthquake force was studied using the quasi-static method. The results show that on static condition, the results calculated by the limit analysis method are very close to those obtained by the limit equilibrium method, which verifies the correctness of this method. With the increment of proportional coefficient of lateral pressure, vertical earth pressure declines while horizontal earth pressure increases, and break angle shows decreasing trend. Effect of asymmetric loads on the stability of shallow tunnels is less than that of proportional coefficient of lateral pressure. The earth pressure and break angle both increase with the increase of the horizontal seismic effect coefficient. With the increase of vertical seismic proportional coefficient, the earth pressure increases but the break angle decreases obviously. Therefore, vertical earthquake force, just like horizontal earthquake force, has significant effect on the stability of shallow tunnels, which can not be neglected in the design of support structures.
Based on two cases of non-bias and bias, from the view of energy, the influence on stability of shallow tunnels from horizontal and vertical earthquake force was studied using the quasi-static method. The results show that on static condition, the results calculated by the limit analysis method are very close to those obtained by the limit equilibrium method, which verifies the correctness of this method. With the increment of proportional coefficient of lateral pressure, vertical earth pressure declines while horizontal earth pressure increases, and break angle shows decreasing trend. Effect of asymmetric loads on the stability of shallow tunnels is less than that of proportional coefficient of lateral pressure. The earth pressure and break angle both increase with the increase of the horizontal seismic effect coefficient. With the increase of vertical seismic proportional coefficient, the earth pressure increases but the break angle decreases obviously. Therefore, vertical earthquake force, just like horizontal earthquake force, has significant effect on the stability of shallow tunnels, which can not be neglected in the design of support structures.
引文
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[14]JTG D70—2004,公路隧道设计规范[S].JTG D70—2004,Code for design of road tunnel[S].
[15]YANG Xiaoli,Jin Qiyun,MA Junqiu.Pressure from surrounding rock of three shallow tunnels with large section and small spacing[J].Journal of Central South University,2012,19(8):2380-2385.
[2]Chen S L,Gui M W.Seismic performance of tunnel lining of side-by-side and vertically stacked twin-tunnels[J].Journal of Central South University of Technology,2011,18(4):1226-1234.
[3]Cilingir U,Madabhushi S P G.Effect of depth on the seismic response of square tunnels[J].Soils and Foundations,2011,51(3):449-457.
[4]Saada Z,Maghous S,Garnier D.Pseudo-static analysis of tunnel face stability using the generalized Hoek-Brown strength criterion[J].International Journal for Numerical and Analytical Methods in Geomechanics,2013,37(18):3194-3212.
[5]WANG Zhengzheng,GAO Bo.Investigation and assessment on mountain tunnels and geotechnical damage after the Wenchuan earthquake[J].Science in China Series E:Technological Science,2009,52(2):546-558.
[6]严松宏,高峰,李德武,等.沉管隧道地震响应分析若干问题的研究[J].岩石力学与工程学报,2004,23(5):846-850.YAN Songhong,GAO Feng,LI Dewu,et al.Studies on some issues of seismic response analyses for submerged tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(5):846-850.
[7]李育枢,高广运,李天斌.偏压隧道洞口边坡地震动力反应及稳定性分析[J].地下空间与工程学报,2006,2(5):738-743.LI Yushu,GAO Guangyun,LI Tianbin.Analysis of earthquake response and stability evaluation for transverse slope at secund tunnel portal[J].Chinese Journal of Underground Space and Engineering,2006,2(5):738-743.
[8]章荣军,郑俊杰,杨庆年.地震作用下浅埋隧道系统锚杆参数优化[J].华中科技大学学报(自然科学版),2009,37(5):98-101.ZHANG Rongjun,ZHENG Junjie,YANG Qingnian.Parameter optimization for systematic bolts of shallow tunnel under earthquake action[J].Journal of Huazhong University of Science and Technology(Nature Science Edition),2009,37(5):98-101.
[9]杨小礼,黄波,王作伟.水平地震力作用下浅埋偏压隧道松动围岩压力的研究[J].中南大学学报(自然科学版),2010,41(3):1090-1095.YANG Xiaoli,HUANG Bo,WANG Zuowei.Rock failure pressure of shallow tunnel subjected to horizontal seismic and unsymmetrical loads[J].Journal of Central South University(Science and Technology),2010,41(3):1090-1095.
[10]Kouretzis G P,Sloan S W,Carter J P.Effect of interface friction on tunnel liner internal forces due to seismic S-and P-wave propagation[J].Soil Dynamics and Earthquake Engineering,2013,46:41-51.
[11]赵炼恒,罗强,李亮,等.层状岩体边坡动态稳定性拟静力上限分析[J].岩土力学,2010,31(11):3627-3634.ZHAO Lianheng,LUO Qiang,LI Liang,et al.Upper bound quasi-static analysis of dynamic stability of layered rock slopes[J].Rock and Soil Mechanics,2010,31(11):3627-3634.
[12]Chen W F.Limit analysis and soil plasticity[M].Florida:J.Ross Publishing,Inc.,2007:47-99.
[13]杨小礼,王作伟.非线性破坏准则下浅埋隧道围岩压力的极限分析[J].中南大学学报(自然科学版),2010,41(1):299-302.YANG Xiaoli,WANG Zuowei.Limit analysis of earth pressure on shallow tunnel using nonlinear failure criterion[J].Journal of Central South University(Science and Technology),2010,41(1):299-302.
[14]JTG D70—2004,公路隧道设计规范[S].JTG D70—2004,Code for design of road tunnel[S].
[15]YANG Xiaoli,Jin Qiyun,MA Junqiu.Pressure from surrounding rock of three shallow tunnels with large section and small spacing[J].Journal of Central South University,2012,19(8):2380-2385.
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