地震荷载下辽西饱和粉土液化特性分析  

Liquefaction behavior of saturated silt under seismic load in westem Liaoning

作　　者：李永靖[1] 马晓涛 邢洋[1] 郝连学 LI Yongjing MA Xiaotao XING Yang HAO Lianxue(Institute of Civil Engineering and Transportation, Liaoning Technical University, Fuxin, Liaoning 123000, China Administration of Fuxin Highway, Fuxin , Liaoning 123000, China)

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000 [2]阜新市公路管理处,辽宁阜新123000

出　　处：《中国地质灾害与防治学报》2017年第3期111-116,共6页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金资助项目(51274111);辽宁省教育厅基金项目(L2013137)

摘　　要：地震荷载作用引起的粉土液化是路基抗震设计的重要问题。通过动三轴试验研究了不同围压、动剪应力条件下辽西地区饱和粉土的液化特性,并利用应变孔压模型对辽西饱和粉土路基进行了液化特性的数值模拟分析。结果表明:围压条件一定时,动剪应力与液化振次呈双曲线关系;抗震设防烈度为7度时,超越概率63.5%和10%的地震荷载不能使辽西饱和粉土发生液化,而超越概率2%时液化深度约为5 m左右,这为粉土路基抗震设计提供了一定的参考依据。The liquefaction behavior of saturated silt under seismic loads is an important engineering problem of seismic design. Based on laboratory dynamic triaxial tests,confining pressure and dynamic shear stress was take into account when the liquefaction behavior of saturated silt in western area of Liaoning Province was studied. The numerical analysis of the liquefaction behavior of saturated silt was carried by a strain pore pressure model. The results showed that the relation between dynamic shear stress and liquefaction vibration times was hyperbola curve. When the fortification intensity is 7, the 63. 5% and 10% probability of exceedance of seismic load can not make liquefied silt. And 2% probability of exceedance induced liquefaction depth of 5 m. The results would provide engineering practical values.

关 键 词：地震荷载 饱和粉土 应变孔压模型 液化特性 数值模拟 

分 类 号：TU443[建筑科学—岩土工程]