郎瑞卿, 闫澍旺, 孙立强, 陈静
AuthorsHTML:郎瑞卿, 闫澍旺, 孙立强, 陈静
AuthorsListE:Lang Ruiqing, Yan Shuwang, Sun Liqiang, Chen Jing
AuthorsHTMLE:Lang Ruiqing, Yan Shuwang, Sun Liqiang, Chen Jing
Unit:天津大学建筑工程学院，天津 300072
Unit_EngLish:School of Civil Engineering, Tianjin University, Tianjin 300072, China
Abstract_Chinese:为了研究水平摩阻力对加筋垫层挠度和复合地基桩土应力比的影响, 以单桩处理范围内的刚性桩网复合地基为研究对象, 考虑加筋垫层的大变形效应和三维尺寸效应, 运用大挠度薄板理论对加筋垫层荷载传递特性进行分析, 建立其挠度控制微分方程, 并结合真实边界条件和桩土相互作用, 将荷载传递过程分为假定状态和实际状态, 运用伽辽金法和功能原理对其挠度进行分步求解．在此基础之上, 利用Winkler地基梁理论对桩土应力比进行计算．采用室内足尺试验对计算方法进行验证, 并综合分析土体基床系数、桩间距、桩径和界面摩擦刚度等因素对桩土应力比的影响．研究表明：理论计算结果与试验结果较为吻合, 桩土应力比随桩间土基床系数和桩径的增大而减小, 随桩间距、界面摩擦刚度和桩体基床系数的增大而增大, 成果可为工程实践提供参考．
Abstract_English:To study the influence of horizontal friction resistance on the deflection of reinforced cushion layer and the stress ratio of pile-soil in composite foundation，the rigid pile-net composite foundation in the effect area of single pile was taken as the research object. Considering the large deflection effect and three-dimensional effect of reinforced cushion，load transfer characteristics were analyzed using large deflection thin plate theory，and the governing differential equation of geogrid flexure deformation was established. Combined with the true three-dimensional boundary conditions and pile-soil interactions，the load transfer process was divided into assumed and actual states. The corresponding solution was deduced by Galerkin method and the principle of function. Based on the deformation of the reinforced cushion layer，the pile-soil stress ratio of rigid pile-net composite foundation was calculated by Winkler foundation beam method. The calculation method was validated by indoor full scale tests. The factors that affect pile-soil stress ratio，such as soil bed coefficient，pile spacing，pile diameter and interface frictional stiffness，were systematically analyzed. It is shown that the analytical solutions show good agreement with the measured data. The pile-soil ratio decreases with the increase of soil bed coefficient and pile diameter，while it increases with the increase of pile spacing，interface friction stiffness and Winkler modulus of pile. The proposed method can be applied in engineering practices.
Keyword_Chinese:刚性桩网复合地基; 桩土应力比; 水平摩阻力; 加筋垫层; 薄板理论
Keywords_English:rigid pile-net composite foundation; pile-soil stress ratio; horizontal friction resistance; reinforced cushion; thin plate theory

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