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场地液化震害定量研究及其应用
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摘要
场地液化程度与震害并不是绝对的正相关性,工程地质条件决定着场地液化的分布范围和震害特性等。借鉴生命线工程和建(构)筑物地震破坏等级划分和震害指数等,并考虑不同规范间的衔接以及震害现场宏观调查的需要,为地震灾后快速评估场地液化震害提供依据,参考前人研究成果,笔者建议宏观液化等级划分为5个等级:基本完好、轻微液化、中等液化、严重液化和毁坏,对应的震害指数范围分别为[0.01,0.10)、[0.10,0.30)、[0.30,0.55)、[0.55,0.85)、[0.85,1.00],并给出具体的建议地震烈度、宏观液化现象和震害程度等。同时,结合2011年东日本9.0级地震、2003年新疆巴楚—伽师6.8级地震、2010年云南盈江5.8级地震和2014年云南景谷6.5级地震进行应用分析表明,研究成果具有较高的可靠性、合理性和实用性。研究成果更适用于辅助确定国内地震的地震烈度图的快速圈定和发布等。
The degree of liquefaction and seismic damage are not absolute positive correlation.The liquefied sites distribution and the liquefaction—induced damage characteristics are decided by the local engineering geologic conditions.Drawing on the experience of classification of earthquake damage to lifeline engineering and buildings(special structures) and damage index,considering the need for the macro investigation of earthquake disaster sites and the convergence of different codes,and referencing to previous research results,the macro — liquefaction level is reclassified into five grades by the authors;basically intact condition,slight liquefaction,medium liquefaction,serious liquefaction and destruction.The corresponding damage index range is respectively:[0.01,0.10),[0.10,0.30),[0.30,0.55),[0.55,0.85),[0.85,1.00].These grades are helpful for the fast assessment of liquefaction —influencing in post—earthquake damage sites.The suggestion seismic intensity,the specific macro—liquefaction phenomena and the degrees of damage of the earthquake are shown.According to application analyses of 2011 the Pacific Coast of Tohoku Earthquake(Japan),2003 Bachu—Jiashi M_s 6.8 earthquake in Xinjiang Province,2010 Yingjiang M_s 5.8 earthquake and 2014 Yunnan Jinggu M,6.5 earthquake in Yunnan Province shown that the research results are of high reliability,rationality and practicability.The quantitative research results of site liquefaction is more suitable for the rapid determination of domestic assistance to determine the earthquake intensity map and release.
引文
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