海域工程场地液化判别中震级取值问题探讨  

Discussion on seismic magnitude determination in liquefaction probability analysis of ocean engineering sites

作　　者：黄雅虹[1] 吕悦军[1] 彭艳菊[1] 沙海军[1] HUANG Yahong;LU Yuejun;PENG Yanju;SHA Haijun(lnstitute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China)

机构地区：[1]中国地震局地壳应力研究所,北京100085

出　　处：《岩石力学与工程学报》2018年第A01期3765-3774,共10页Chinese Journal of Rock Mechanics and Engineering

基　　金：中央公益性科研院所基本科研业务专项(ZDJ2015–02);公益性地震行业专项(201408002)~~

摘　　要：在利用经典的Seed抗液化剪应力法进行工程场地液化判别中,需要确定震级等几个关键性的参数,但目前在许多海域工程场地的砂土地震液化危险性判定中,因周围缺乏可参考的工程等原因,地震参数往往难以确定。针对海域工程的这一实际情况,提出借用地震危险性综合概率分析方法所确定的场地可能遭受破坏性地震的等效震级作为参考量值,并尝试将其应用于渤海海域2个海洋平台场地海底泥面以下15 m范围内的饱和粉、砂土层液化判定。结果表明,该方法具有较好的效果,能为海域工程场地砂土液化势的概率判定提供更加合理的震级参数,具有较好的实用价值。When the classical Seed？s liquefaction resistance shear stress analysis method is used to evaluate the liquefaction potential of an engineering site,seismic magnitude and other several key parameters are essential. However,it is often difficult to determine the seismic magnitude parameter for some ocean engineering sites,because of the lack of nearby referential engineering sites. In order to solve this problem,we proposed that the equivalent seismic magnitude determined from the comprehensive seismic risk probability analysis method could be used as the reference magnitude for the evaluation of site liquefaction potential. The proposed method was applied to two ocean oil platform sites in Bohai Sea to evaluate the liquefaction potential of the saturated sand layers with a thickness of 15 m below seabed mud. The results showed that the method has satisfying effect and practical value in liquefaction potential evaluation for ocean engineering sites.

关 键 词：土力学 海域工程场地 砂土液化判定 震级参数取值 渤海石油平台 

分 类 号：TU32[建筑科学—结构工程]