地震力作用下浅埋偏压隧道围岩压力的解析解
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摘要
以拟静力法为基础,通过地震力偏角的旋转,结合极限平衡条件,推导出地震作用下浅埋偏压隧道围岩压力的解析解,并探讨了其影响因素.研究发现地震侧压力系数受岩土体力学指标的影响明显.在地震力作用下,竖向地震加速度系数使拱顶总垂直压力值减少,多数情况下会降低地震侧压力系数;水平向地震加速度系数对总垂直地震压力和地震侧压力系数的影响规律取决于水平地震力的方向.浅埋侧的地震侧压力系数随着地面倾角的增大而减小,而深埋侧的地震侧压力系数随着地面倾角的增大而增大.
Based on the pseudo-static method,an analytical solution of rock pressure for shallow-buried unsymmetrical loading tunnels under earthquake loading was derived by rotating the deflection angles of earthquake force and combining the limit equilibrium condition,with discussion on the influencing factors of rock pressure.It is found that the mechanical indexes of rock soil mass have an obvious influence on the lateral pressure coeffcient.Under earthquake loading,the vertical earthquake acceleration coeffcient always decreases the total vertical pressure on the vault and lowers the lateral pressure coeffcient in most cases.The impact of horizontal earthquake acceleration coeffcient on the total vertical pressure on the vault and the lateral pressure coeffcient depends on the direction of horizontal earthquake force.The lateral pressure coeffcient of the shallow-buried side always decreases with increasing ground inclination,but the lateral pressure coeffcient of the deep-buried side increases.
Based on the pseudo-static method,an analytical solution of rock pressure for shallow-buried unsymmetrical loading tunnels under earthquake loading was derived by rotating the deflection angles of earthquake force and combining the limit equilibrium condition,with discussion on the influencing factors of rock pressure.It is found that the mechanical indexes of rock soil mass have an obvious influence on the lateral pressure coeffcient.Under earthquake loading,the vertical earthquake acceleration coeffcient always decreases the total vertical pressure on the vault and lowers the lateral pressure coeffcient in most cases.The impact of horizontal earthquake acceleration coeffcient on the total vertical pressure on the vault and the lateral pressure coeffcient depends on the direction of horizontal earthquake force.The lateral pressure coeffcient of the shallow-buried side always decreases with increasing ground inclination,but the lateral pressure coeffcient of the deep-buried side increases.
引文
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[13]Chongqing Communications Research and Design Insti-tute.JTG 070—2004 Code for Design of Road Tunnel.Beijing:China Communications Press,2004(重庆交通科研设计院.JTG070—2004公路隧道设计规范.北京:人民交通出版社,2004)
[2]Yashiro K,Kojima Y,Shimizu M.Historical earthquakedamage to tunnels in Japan and case studies of railwaytunnels in the 2004 Niigataken-Chuetsu earthquake.QRep RTRI,2007,48(3):136
[3]Gao B,Wang Z Z,Yuan S,et al.Lessons learnt fromdamage of highway tunnels in Wenchuan earthquake.JSouthwest Jiaotong Univ,2009,44(3):336(高波,王峥峥,袁松,等.汶川地震公路隧道震害启示.西南交通大学学报,2009,44(3):336)
[4]Cui G Y,Wang M N,Lin G J,et al.Study of the earth-quake damage mechanism and aseismatic countermeasureof a highway tunnel portal section in the Wenchuan seis-mic disaster area.Mod Tunnelling Technol,2011,48(6):6(崔光耀,王明年,林国进,等.汶川地震公路隧道洞口段震害机理及抗震对策研究.现代隧道技术,2011,48(6):6)
[5]Wang M N,Cui G Y.Establishment of tunnel dampingmodel and research on damping effect with model test inhighly seismic area.Rock Soil Mech,2010,31(6):1884(王明年,崔光耀.高烈度地震区隧道减震模型的建立及其减震效果模型试验研究.岩土力学,2010,31(6):1884)
[6]Li T B.Failure characteristics and influence factor analysisof mountain tunnels at epicenter zones of great Wenchuanearthquake.J Eng Geol,2008,16(6):742(李天斌.汶川特大地震中山岭隧道变形破坏特征及影响因素分析.工程地质学报,2008,16(6):742)
[7]Highway Planning and Design Institute of the Ministryof Communications.JTJ 004—89 Specification of Earth-quake Resistant Design for Highway Engineering.Beijing:China Communications Press,1989(交通部公路规划设计院.JTJ004—89公路工程抗震设计规范.北京:人民交通出版社,1989)
[8]Li Y C,Chen Q J.Analysis on characteristics of near-faultground motions based on M8.0 Wenchuan earthquake.JCatastrophol,2012,27(1):17(李英成,陈清军.基于汶川8.0级强震记录的近场地震动特征分析.灾害学,2012,27(1):17)
[9]Liu R S,Hu S Q,Shi H B.Study on seismic loading ofpseudo-static approach used in the seismic design of un-derground structure.Chin J Geotech Eng,2007,29(2):237(刘如山,胡少卿,石宏彬.地下结构抗震计算中拟静力法的地震荷载施加方法研究.岩土工程学报,2007,29(2):237)
[10]Yang X L,Huang B,Wang Z W.Rock failure pressureof shallow tunnel subjected to horizontal seismic and un-symmetrical loads.J Cent South Univ Sci Technol,2010,41(3):1090(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.中南大学学报:自然科学版,2010,41(3):1090)
[11]Yuan Y,Yu H T,Chen Z Y.Evaluation of seismic calcu-lation methods for shallow-buried frame structures in softsoil.J Vib Shock,2009,28(8):50(袁勇,禹海涛,陈之毅.软土浅埋框架结构抗震计算方法评价.振动与冲击,2009,28(8):50)
[12]Wang Y Y,Gao Y T,Cai S J,et al.Research on the sta-bility of diaphragm walls subjected to earthquake usingpseudo-static method.J Univ Sci Technol Beijing,2010,32(5):559(王运永,高永涛,蔡嗣经,等.考虑地震影响的地下连续墙稳定性拟静力法研究.北京科技大学学报,2010,32(5):559)
[13]Chongqing Communications Research and Design Insti-tute.JTG 070—2004 Code for Design of Road Tunnel.Beijing:China Communications Press,2004(重庆交通科研设计院.JTG070—2004公路隧道设计规范.北京:人民交通出版社,2004)
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