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

作者:: 邱梦瑶¹; 陈树培¹; 唐亮^1; 凌贤长¹; 2; 张效禹³; 李雪伟¹; 刘书幸¹; (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)

Author(s):: QIU Mengyao¹; CHEN Shupei¹; TANG Liang¹; LING Xianzhang¹; 2; ZHANG Xiaoyu³; LI Xuewei¹; LIU Shuxing¹; (1.School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,Heilongjiang,China)(2.School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,Shandong,China)(3.School of Civil Engineering,Guangzhou University,Guangzhou 510006,Guangdong,China)

Keywords:: geosynthetic-encased stone column; liquefaction resistance; shear stress reduction coefficient ratio; evaluation method

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。

Abstract:: 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.