加筋碎石桩复合饱和砂土地基抗液化性能评价方法  

A Simplified Evaluation Method of Liquefaction Resistance for Composite Foundation Reinforced by Geosynthetic-reinforced Gravel Pile

作　　者：邱梦瑶 陈树培 唐亮[1] 凌贤长[1,2] 张效禹 李雪伟 刘书幸 QIU Mengyao;CHEN Shupei;TANG Liang;LING Xianzhang;ZHANG Xiaoyu;LI Xuewei;LIU Shuxing(School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,Heilongjiang,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,Shandong,China;School of Civil Engineering,Guangzhou University,Guangzhou 510006,Guangdong,China)

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [2]青岛理工大学土木工程学院,山东青岛266033 [3]广州大学土木工程学院,广东广州510006

出　　处：《地震研究》2020年第3期554-562,603,共10页Journal of Seismological Research

基　　金：国家重点研发计划战略性国际科技创新合作重点专项(2016YFE0205100);黑龙江省应用技术研究与开发计划项目(GA19A501);国家自然科学基金项目(51578195和51608533)联合资助.

摘　　要：针对如何科学合理地评价液化场地加筋碎石桩复合饱和砂土地基抗液化能力这一问题,利用OpenSees计算平台建立非线性有限元数值模型,并与模型试验进行对比分析,验证数值模型的准确性;进而研究分析了不同工况下复合地基剪应力折减系数比的变化规律,并修正其计算公式,提出并验证适合评价复合地基抗液化能力的简化方法。研究表明:随着桩径、加筋体强度和桩土剪切模量比的增大,复合地基剪应力折减系数比不断增大;以桩土剪切模量比作为控制参量,评价单一液化土层条件下沿桩身全长布筋的加筋碎石桩复合场地抗液化能力的简化方法准确可信。In order to evaluate the liquefaction resistance capability of the composite saturated sandy soil foundation with geosynthetic-encased stone column scientifically and reasonably,the accuracy of the numerical model is verified by the comparative of nonlinear finite element numerical simulation and model test using the Opensees computing platform.Then the variation law of shear stress reduction coefficient ratio of composite foundation under different working conditions is studied and analyzed.The results show that the shear stress reduction coefficient ratio of composite foundation increases with the increase of the pile diameter,reinforced body strength,and pile-soil shear modulus ratio.Also,the calculation method of shear stress reduction coefficient ratio of composite foundation is modified.Finally,a simplified method is proposed and verified to evaluate the liquefaction resistance capability of the geosynthetic-encased stone column in a single liquefied soil layer with the pile-soil shear modulus ratio as the control parameter.

关 键 词：加筋碎石桩 抗液化能力 剪应力折减系数比 评价方法 

分 类 号：TU195[建筑科学—建筑理论]