小角度成层倾斜场地动力响应分析的大型振动台试验研究
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摘要
基于大型振动台试验,研究小角度成层倾斜场地在倾向、走向、垂向、坡面方向、坡面垂直方向上的地震动响应特征,以及地层倾角对场地反应谱的影响规律。试验结果表明:在倾向方向,随着地层倾角的增大,倾斜场地的放大效应增大;在走向方向,当地层倾角小于12.5°时,放大效应强于水平成层场地;在倾向、走向方向,当地层倾角达到12.5°时,场地对反应谱短周期T≤0.1 s部分具有放大作用,对T>0.1 s的部分具有削弱作用;在垂向方向,随着地层倾角的增加,倾斜场地的放大效应强于水平成层场地;在坡面方向,倾斜场地的放大效应弱于水平成层场地;在坡面垂向方向,倾斜场地的放大效应强于水平成层场地。该研究成果对小角度成层倾斜场地上的建筑物抗震设计具有一定的参考意义。
With large scale shaking table tests, the effects of dip direction, strike, vertical direction, slope surface direction, dip angle and direction perpendicular to slope surface on seismic response of inclined and layered site are studied. The research results show that the amplification effect of inclined site in dip direction trends to increase with increasing dip angle of strata. In strike, the amplification effect of inclined site is stronger than that in horizontal layered site when the dip angle is less than 12.5°; in both dip and strike directions, when the dip angle reaches to 12.5°, the site has an amplification influence on the part of T ≤0.1 s period in response spectrum and a weakening influence on the part of T >0.1 s period. In the vertical direction, the amplification effect of inclined and layered site is stronger than that of the horizontal layered site with increasing dip angle. The amplification effect of inclined and layered site in slope surface direction is less than that of horizontal layered site, while the amplification effect in the direction perpendicular to slope surface is stronger than that of horizontal layered site. The research results provide a reference for construction design in inclined and layered sites with small dip angles.
With large scale shaking table tests, the effects of dip direction, strike, vertical direction, slope surface direction, dip angle and direction perpendicular to slope surface on seismic response of inclined and layered site are studied. The research results show that the amplification effect of inclined site in dip direction trends to increase with increasing dip angle of strata. In strike, the amplification effect of inclined site is stronger than that in horizontal layered site when the dip angle is less than 12.5°; in both dip and strike directions, when the dip angle reaches to 12.5°, the site has an amplification influence on the part of T ≤0.1 s period in response spectrum and a weakening influence on the part of T >0.1 s period. In the vertical direction, the amplification effect of inclined and layered site is stronger than that of the horizontal layered site with increasing dip angle. The amplification effect of inclined and layered site in slope surface direction is less than that of horizontal layered site, while the amplification effect in the direction perpendicular to slope surface is stronger than that of horizontal layered site. The research results provide a reference for construction design in inclined and layered sites with small dip angles.
引文
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[2]任德惠,张平.不同倾角结构面对巷道稳定性的影响[J].煤炭学报,1998,(3):11-17.REN De-hui,ZHANG Ping.Study on effect of structure plane with varying inclinations on stability of roadway with a 3D model[J].Journal of China Coal Society,1998,(3):11-17.
[3]成永刚,王玉峰.层面倾角对顺层岩质滑坡贡献率研究[J].岩土力学,2011,32(12):3708-3712.CHENG Yong-gang,WANG Yu-feng.Research on contribution rate for dip angle of bedding landslide[J].Rock and Soil Mechanics,2011,32(12):3708-3712.
[4]蒯行成,王磊,王贻荪.倾斜层-弹性半空间中瞬态SH波的有限元分析[J].计算结构力学及其应用,1989,6(3):33-43.KUAI Xing-cheng,WANG Lei,WANG Yi-sun.Finite element analysis of transient SH wave in dipping layer over an elastic half-space[J].Computational Structural Mechanics and Applications,1989,6(3):33-43.
[5]张建经,韩鹏飞.重力式挡墙基于位移的抗震设计方法研究——大型振动台模型试验研究[J].岩土工程学报,2012,34(3):417-423.ZHANG Jian-jing,HAN Peng-fei.Displacement-based aseismic design method for gravity retaining walls-large scale shaking table tests[J].Chinese Journal of Geotechnical Engineering,2012,34(3):417-423.
[6]文畅平,杨果林.地震作用下挡土墙位移模式的振动台试验研究[J].岩石力学与工程学报,2011,30(7):1502-1512.WEN Chang-ping,YANG Guo-lin.Large-scale shaking table tests study of seismic displacement mode of retaining structures under earthquake loading[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(7):1502-1512.
[7]黄润秋,李果,巨能攀.层状岩体斜坡强震动力响应的振动台试验[J].岩石力学与工程学报,2013,32(5):865-876.HUANG Run-qiu,LI Guo,JU Neng-pan.Shaking table test on strong earthquake response of stratified rock slopes[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(5):865-876.
[8]曲宏略,张建经.地基条件对挡土墙地震土压力影响的振动台试验研究[J].岩土工程学报,2012,34(7):1228-1233.QU Hong-lue,ZHANG Jian-jing.Shaking table tests on influence of site conditions on seismic earth pressures of retaining wall[J].Chinese Journal of Geotechnical Engineering,2012,34(7):1228-1233.
[9]董金玉,杨国香,伍法权,等.地震作用下顺层岩质边坡动力响应和破坏模式大型振动台试验研究[J].岩土力学,2011,32(10):2977-2988.DONG Jin-yu,YANG Guo-xiang,WU Fa-quan,et al.The large-scale shaking table test study of dynamic response and failure mode of bedding rock slope under earthquake[J].Rock and Soil Mechanics,2011,32(10):2977-2988.
[10]刘汉香,许强,徐鸿彪,等.斜坡动力变形破坏特征的振动台模型试验研究[J].岩土力学,2011,32(2):334-339.LIU Han-xiang,XU Qiang,XU Hong-biao,et al.Shaking table model test on slope dynamic deformation and failure[J].Rock and Soil Mechanics,2011,32(2):334-339.
[11]朱宏伟,姚令侃,张旭海.两种加筋土挡墙的动力特性比较及抗震设计建议[J].岩土工程学报,2012,34(12):2073-2080.ZHU Hong-wei,YAO Ling-kan,ZHANG Xu-hai.Comparison of dynamic characteristics between netted and packaged reinforced soil retaining walls and recommendations for seismic design[J].Chinese Journal of Geotechnical Engineering,2012,34(12):2073-2080.
[12]吴火珍.地震滑坡频谱分析方法研究[D].武汉:中国科学院武汉岩土力学研究所,2010.
[13]ZHANG J,QU H L,HAN P F.Seismic earth pressures of retaining wall from lame shaking table tests[C]//Proceedings of 14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering.Honk Kong:Advanced in Materials,2011.
[14]龚志红,李天斌,龚习炜,等.攀枝花机场北东角滑坡整治措施研究[J].工程地质学报,2007,15(2):237-243.GONG Zhi-hong,LI Tian-bin,GONG Xi-wei,et al.Remediation measures on the land slop in fill slopes in northeast part of Panzhihua airport[J].Journal of Engineering Geology,2007,15(2):237-243.
[15]胡进军,谢礼立.地下地震动频谱特点研究[J].地震工程与工程振动,2004,24(6):1-8.HU Jin-jun,XIE Li-li.Spectral characteristics of earthquake subground motions[J].Earthquake Engineering and Engineering Vibration,2004,24(6):1-8.
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