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为解决现有梁、板法不能同时考虑桩土差异刚度、布桩形式以及摩阻效应对土工格室加筋体变形影响的问题,将单桩影响范围内的土工格室视为受上部荷载、水平摩阻力及桩土支撑力共同作用下的弹性圆薄板,并基于Winkler假定考虑了土工格室与桩土加固区的变形协调;根据单元体静力平衡建立了考虑水平摩阻效应的格室体挠曲变形控制微分方程,利用Bessel复变函数构造出不同条件下的挠度解析表达式,在此基础上得到了双向增强复合地基网下桩土应力比、沉降及桩土差异沉降的计算公式;采用室内试验对该方法进行了验证,并在此基础上利用该方法探讨分析了格室加筋体的复合弹性模量、水平摩阻系数、桩土刚度比等因素对双向增强复合地基网下桩土应力比和沉降的影响。研究结果表明:与实测值的对比结果显示该方法具有可行性;摩阻效应对桩土差异沉降影响较大,且在桩土刚度较大或加筋体复合弹性模量较小时,摩阻效应对桩土应力比、沉降影响亦十分显著。
In order to solve the problem that the existing beam and plate method can not simultaneously consider the differential stiffness of pile and soil, the form of piles and the effect of friction effect on the deformation of geocell reinforced body, the geocell within the influence range of single pile is regarded as affected by the upper load , Horizontal frictional resistance and pile-soil supporting force. Based on the Winkler assumption, the deformation coordination between geocell and pile-soil reinforced zone was considered. Based on the static balance of the unit body, a grid with horizontal frictional resistance The differential equations of deflection and deformation control of the body are obtained. Bessel complex functions are used to construct the analytical solutions of the deflection under different conditions. Based on this, the stress-strain ratio, settlement and pile-soil differential settlement under the net of the composite foundation are obtained. This method was verified by indoor test. On the basis of this, the method was used to analyze and analyze the influence of complex elastic modulus, horizontal friction coefficient and pile-soil stiffness ratio of reinforced cell in two-way reinforced composite foundation Effect of Pile - soil Stress Ratio and Settlement Under a Network. The results show that compared with the measured values, the method is feasible. The friction effect has a great influence on the differential settlement of pile-soil. When the stiffness of pile-soil is large or the elastic modulus of reinforcement is small, the frictional resistance The pile-soil stress ratio, settlement impact is also very significant.