康定M_S6.3级地震斜坡地震动响应监测分析
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摘要
芦山MS7.0地震、鲁甸MS6.5地震诱发了大量的次生山地灾害,一些学者认为地形放大效应是其中的一个影响因素,但目前斜坡地震动响应研究仍然缺乏大量的实测数据支撑。通过在冷竹关两岸斜坡不同部位掘进平硐并放置强震监测仪器的方法,对沟谷两岸斜坡地震动响应特征进行研究,剖面较为完整地记录了康定地震两岸斜坡的地震动响应特征。监测数据揭示,(1)相对于康定姑咱参考站,位于右岸"半岛状"凸出山梁顶部1#监测点的水平和竖直向PGA放大系数分别达到了10.6~11.5、7.1,阿里亚斯强度最大,水平东西向比竖直向HVSR频比值达到11.1,卓越周期在低频部分;位于右岸山梁中部2#监测点水平和竖直向PGA放大系数分别达到了4.3~5.0、2.3;(2)左岸地形坡面起伏较小,记录的峰值加速度较小,仅在坡折部位5#监测点有明显的放大,水平与垂直峰值加速度放大系数分别为3.0~4.5、2.3,各监测点频比存在多个卓越周期,其放大效应在高频段更突出;(3)近直线型斜坡内(6#及7#监测点)放大效应相对较弱,且监测洞外侧放大系数大于水平深度较大的内侧。结果表明冷竹关两岸斜坡存在明显的地形放大效应,且右岸"半岛状"凸出山脊地形较左岸中高山斜坡地形放大效应显著。对比芦山地震该剖面放大系数,揭示了背坡面效应。
Many secondary natural geological disasters are caused by Lushan MS7. 0 and Ludian MS6. 3earthquake. Some scholars consider the disasters may be associated with topographic amplification effect of seismic waves. But it is still lack of a large number of slope seismic response data to verify such hypothesis. The strong monitoring site of Luding Lengzhuguan is located on both sides of the Lengzhuguan valley,a tributary of the Dadu River and situated to the right back of the river. Tunnels excavated in different parts of the slope are used to place earthquake monitoring instruments on both sides of the valley. The instruments monitored the Kangding MS6. 3earthquake on November 22,2014 in Sichuan,China. The earthquake monitoring data show the follows:( 1)Reference to Kangding Guzan strong earthquake monitoring station of the main shock records( its horizontal and vertical PGA components are 16. 4 and 15. 7gal,respectively),the horizontal and vertical PGA amplification factorsof the 1#monitoring site on the top of the peninsular terrain on the right bank reach 10. 6- 11. 5 and 7. 1,respectively. The Arias Intensity of the 1#monitoring site is largest. The Predominant Period was concentrated in the low-frequency,and horizontal to vertical spectral ratio reaches 11. 1. The horizontal and vertical PGA amplification factors of the 2#monitoring site in the middle reach 4. 3-5. 0 and 2. 3,respectively. Both of the Arias Intensity and horizontal to vertical spectral ratio were smaller than those at 1#.( 2) The slope terrain variation on the left bank is small and the record of PGA is low. the result at the 5#monitoring site is enlarged obviously. The horizontal and vertical PGA amplification factors are 2. 1- 4. 5 and 1. 7- 2. 3,respectively. The monitoring sites on the left bank have several Predominant Period. The amplification effect is more prominent at high-frequency. The Arias Intensity of each is smaller than the right monitoring sites.( 3) Ground motion topographic amplification effect in the nearly linear slope part is weak( 6#and 7#).Some monitoring sites are narrowed to varying degrees. The amplification factor of the outside monitoring site is larger than the level depth of the inside monitoring site. Studies suggest that ground motion topographic amplification effect is obvious on both sides of the Lengzhuguan valley. The topography amplification effect of the peninsular terrain on the right bank is stronger than that on the left nearly linear slope.Furthermore,the amplification factor on the top of the peninsular terrain on the right bank is bigger than that on the middle. The topography amplification effect on the part of slope break is obvious and the part of nearly linear slope is weaker. According to direction of seismic wave propagation,the Lengzhuguan monitoring station is at the back side for Kangding earthquake. It is contrary for Lushan earthquake. Comparison of the results between the seismic data of Kangding earthquake and Lushan earthquake,it is found that the PGA amplification coefficients of each monitoring site during Kangding earthquake is bigger than those at Lushan earthquake. One result reaches to 5times.
引文
Boit M A.1941.A mechanical analyzer for prediction of earthquakestress[J].Bulletin of the Seismological Society of America,31:151~171.
    Celebi M.1987.Topographic and geological amplification determinedfrom strong motion and aftershock records of March 1985 Chileearthquake[J].Bulletin of the Seismological Society of America,77(4):1147~1167.
    Chavez Garcia F J,Dominguez T,Rodriguez M,et al.2007.Site effects ina volcanic environment:a comparison between HVSR and arraytechniques at Colima,Mexico[J].Bulletin of the SeismologicalSociety of America,97(2):591~604.
    Chen G P,Wen L H·H S,Wang S.2011.Comparisons of variouscharacteristic parameters of strong motions[J].South China Journalof Seismology,31(2):45~53.
    Geli L,Bard P Y,Jullien B.1988.The effect of topography on earthquakeground motion:a review and new results[J].Bulletin of theSeismological Society of America,78:42~63.
    Housner G W.1959.Behavior of Structures during Earthquakes[J].Journal of the Engineering Mechanics Division.,ASCE,85(EM4):109~129.
    Huang D J.1989.The extraction of main characteristic parameters ofseismic wave[J].Oil Geophysical Prospecting,24(2):155~165.
    Huang R Q,Wang Y S,Pei X J,et al.2013.Characteristics of co-seismiclandslides triggered by the Lushan Ms7.0 Earthquake on the 20th ofApril,Sichuan Province,China[J].Journal of Southwest JiaotongUniversity,48(4):581~589.
    Huang R Q,Li W L.2009.Fault effect analysis of geo-hazard triggered byWenchuan earthquake[J].Journal of Engineering Geology,17(1):19~28.
    Huang R Q,Li W L.2008.Research on development and distributionrules of geo-hazards induced by Wenchuan earthquake on 12thMay,2008[J].Chinese Journal of Rock Mechanics and Engineering,27(12):2585~2592.
    Li J.1993.Several response spectrums'conception difference and theirsignificance[J].World Earthquake Engineering,9(4):9~14.
    Luo Y H,Wang Y S,Wang F H,et al.2010.Monitoring of slope seismicresponse during aftershocks of Wenchuan Earthquake in QingchuanCounty[J].Journal of Engineering Geology,18(1):27~34.
    Luo Y H,Wang Y S,He Y,et al.2013b.Monitoring result analysis ofLenzhuguan slope ground shock response of Lushan earthquake ofSichuan,China[J].Journal of Chengdu University of Technology(Science&Technology Edition),40(3):232~241.
    Luo Y H,Wang Y S.2013a.A study on the mountain slope ground motiontopography amplification effect induced by Wenchuan Earthquake[J].Journal of Mountain Science,31(2):200~210.
    National Energy Board of China.2009.Specification of strong motionsafety monitoring for hydraulic structures(DZ/5416-2009)[S].Beijing:China Electric Power Press.
    Qi S W,Wu F Q,Yan F Z,et al.2007.Rock slope dynamic responseanalysis[M].Beijing:Science Press.
    Shen T,Wang Y S,Wu L K.2014.Discrete element simulation analysis offormation mechanism of Xiaonanhai landslide in Chongqing city[J].Rock and Soil Mechanics,35(2):667~675.
    Tang C A,Zuo Y J,Qin S F,et al.2008.Spalling and slinging pattern ofshallow slope and dynamics explanation in the 2008 Wen Chuanearthquake[A]∥Proceedings of the 10th Conference on RockMechanics and Engineering,China[C].Beijing:China ElectricPower Press,258~262.
    Tao X X,Wang G X.2003.Rupture directivity and hanging wall effect innear field strong ground motion simulation[J].Acta SeismologicaSinica,25(2):191~198.
    Wen R Z,Ren Y F,Qi W H,et al.2013.Maximum acceleration recordingfrom Lushan Earthquake on April 20,2013[J].Journal ofSouthwest Jiaotong University,48(5):783~791.
    Xu Q,Li W L.2010.Study on the direction effects of landslides triggeredby wenchuan Earthquake[J].Journal of Sichuan University(Engineering Science Edition),42(S1):7~14.
    Zhang D L,Zhou Z H,Tao X X.2009.Influence of seismic sourcemechanism and fault property on near-field strong ground motion[J].Northwestern Seismological Journal,31(4):311~318.
    Zhou X T,Han J L,Shi F G,et al.2014.Numerical simulation foramplification effect of topography and geomorphology to seismicwaves[J].Journal of Engineering Geology,22(6):1211~1220.
    陈国平,温留汉·黑沙,王帅.2011.多种表征强震动记录特性的参数对比分析[J].华南地震,31(2):45~53.
    黄德济.1989.地震波主特性参数的提取[J].石油地球物理勘探,24(2):155~165.
    黄润秋,王运生,裴向军,等.2013.4·20芦山Ms7.0级地震地质灾害特征[J].西南交通大学学报,48(4):581~589.
    黄润秋,李为乐.2009.汶川大地震触发地质灾害的断层效应分析[J].工程地质学报,17(1):19~28.
    黄润秋,李为乐.2008.“5·12”汶川大地震触发地质灾害的发育分布规律研究[J].岩石力学与工程学报,27(12):2585~2592.
    李杰.1993.几类反应谱的概念差异及其意义[J].世界地震工程,9(4):9~14.
    罗永红,王运生,王福海,等.2010.青川县桅杆梁斜坡地震动响应监测研究[J].工程地质学报,18(1):27~34.
    罗永红,王运生.2013a.汶川地震诱发山地斜坡地震动地形放大效应研究[J].山地学报,31(2):200~210.
    罗永红,王运生,何源,等.2013b.“4·20”芦山地震冷竹关地震动响应监测数据分析[J].成都理工大学学报(自然科学版),40(3):232~241.
    中华人民共和国国家能源局.2009.水工建筑物强震动安全监测技术规范(DZ/5416-2009)[S].北京:中国电力出版社.
    祁生文,伍法权,严福章,等.2007.岩质边坡动力反应分析[M].北京:科学出版社.
    申通,王运生,吴龙科.2014.重庆小南海滑坡形成机制离散元模拟分析[J].岩土力学,35(增2):667~675.
    唐春安,左宇军,秦泗凤,等.2008.汶川地震中的边坡浅层散裂与抛射模式及其动力学解释[A]∥第十届全国岩石力学与工程学术大会论文集[C].北京:中国电力出版社,258~262.
    陶夏新,王国新.2003.近场强地震动模拟中对破裂的方向性效应和上盘效应的表达[J].地震学报,25(2):191~198.
    温瑞智,任叶飞,齐文浩,等.2013.2013年4月20日芦山地震最大加速度记录分析[J].西南交通大学学报,48(5):783~791.
    许强,李为乐.2010.汶川地震诱发滑坡方向效应研究[J].四川大学学报(工程科学版),42(增1):7~14.
    张冬丽,周正华,陶夏新.2009.震源破裂方式和断层性质对近场强地震动特征的影响[J].西北地震学报,31(4):311~318.
    周兴涛,韩金良,施凤根,等.2014.地形地貌对地震波放大效应数值模拟研究[J].工程地质学报,22(6):1211~1220.

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