| 青藏工程走廊多年冻土场地地震动加速度峰值特征研究 |
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| 引用本文： | 苏永奇,马巍,吴志坚,马尔曼.青藏工程走廊多年冻土场地地震动加速度峰值特征研究[J].冰川冻土,2016(4):1090-1098. |
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| 作者姓名： | 苏永奇 马巍 吴志坚 马尔曼 |
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| 作者单位： | 1. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点实验室，甘肃 兰州 730000; 中国科学院大学，北京 100049; 中国地震局 兰州地震研究所，甘肃 兰州 730000;2. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点实验室,甘肃 兰州,730000;3. 中国地震局 兰州地震研究所,甘肃 兰州,730000 |
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| 基金项目： | 中国地震局地震预测研究所基本科研业务费专项(2016IESLZ02)；国家重点基础研究发展计划(973计划)项目(2012CB026106)；国家自然科学基金项目(51408567) |
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| 摘 要： | 根据青藏工程走廊北麓河及楚玛尔河场地地震危险性分析结果,合成年超越概率为1.97%、1.00%、0.21%、0.10%、0.04%、0.02%的人造基岩地震波作为输入地震动,结合场地钻孔剖面及波速资料,和已有的冻土动力学研究成果,建立一维模型,通过等效线性化方法进行场地地震反应分析计算,研究了青藏工程走廊多年冻土场地地震动加速度峰值特征及影响因素.研究结果表明,北麓河场地与楚玛尔河场地的人造基岩地震波峰值及持时均存在显著差异,北麓河场地峰值大、持时短,以近震影响为主,楚玛尔河场地峰值小、持时长,以中远震影响为主;多年冻土区场地,夏季场地地震动加速度峰值显著大于冬季,活动层融化对场地地震动加速度峰值有明显的放大效应;冬季场地冻结后,场地地震动加速度峰值随冻土波速增大而减小,最大减小幅度为6.1%,随动剪切模量比减小、阻尼比增大而减小,最大减小幅度为8.9%.活动层的融化有利于放大场地地震动加速度峰值,重大冻土工程抗震设防应予以重视.
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| 关 键 词： | 青藏工程走廊 多年冻土 场地地震动加速度峰值 场地地震反应 |
Study on characteristics of seismic peak ground acceleration at permafrost sites along Qinghai-Tibet Engineering Corridor |
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| SU Yongqi,MA Wei,WU Zhijian,MA Erman.Study on characteristics of seismic peak ground acceleration at permafrost sites along Qinghai-Tibet Engineering Corridor[J].Journal of Glaciology and Geocryology,2016(4):1090-1098. |
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| Authors: | SU Yongqi MA Wei WU Zhijian MA Erman |
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| Abstract: | Based on the results of the seismic hazard analysis of the Beiluhe site and Chumaerhe site along Qinghai-Tibet engineering corridor,artificial bedrock seismic waves with the exceedance probabilities of 1.97%, 1.00%,0.21%,0.10%,0.04%,0.02% in 1 year were synthesized to use as input waves.One-dimensional model was established by integrating borehole profiles,wave velocities and the existing research results of frozen soil dynamic parameters.Used an equivalent linearity seismic response analysis method,characteristics of site seismic peak ground acceleration (SSPGA)and its influential factors at permafrost sites along Qinghai-Tibet Engineering Corridor (QTEC)were studied.The results show that,(1)peak values and durations of artificial bedrock seismic waves of the Beiluhe site are significantly different from Chumaerhe site,(2)in permafrost site, SSPGA in summer significantly greater than in winter;because the thawed active layer has amplified SSPGA, (3)after frozen in winter,SSPGA decreases with the increase of the frozen soil wave velocity,maximum decrease amplitude is 6.1%,SSPGA decreases with the decrease of Gd /Gdmax and increase of λ,maximum decrease amplitude is 8.9%.The thawing of the active layer has the effect to enlarge SSPGA,so seismic fortifi-cation of the major permafrost project should be attached more importance. |
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| Keywords: | Qinghai-Tibet Engineering Corridor (QTEC) permafrost site site seismic peak ground accelera-tion (SSPGA) site seismic response |
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