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深入研究柔性基础下碎石桩复合地基受力变形机理,考虑到碎石桩复合地基桩体侧向鼓胀及桩体的整体性,在径向位移模式分析中引入横截面剪应力的影响,并由此建立了碎石桩鼓胀段荷载传递模式。然后,结合桩身荷载传递规律,导出了柔性基础下碎石桩鼓胀变形的控制微分方程,获得了柔性基础下碎石桩复合地基桩土应力比及沉降。最后通过实例和数值模拟分析,表明该方法具有较好的合理性与可行性,参数分析表明,增大桩土模量比和减少置换率会提高桩土应力比,荷载水平则会影响径向鼓胀变形的程度。
In-depth study of the stress and deformation mechanism of gravel pile composite foundation under the flexible foundation, taking into account the lateral bulging of the gravel pile composite foundation and the integrity of the pile body, the influence of cross-section shear stress is introduced in the radial displacement mode analysis As a result, the mode of load transfer in the expansion section of gravel pile was established. Then, combined with the law of load transfer of the pile body, the governing differential equations of the deformation of the screw pile under the flexible foundation are deduced, and the pile-soil stress ratio and settlement of the gravel pile composite foundation under the flexible foundation are obtained. Finally, an example and numerical simulation are conducted to show that the proposed method is reasonable and feasible. Parameter analysis shows that increasing the modulus ratio of pile-soil and reducing the displacement ratio will increase the stress ratio of pile-soil, and the load level will affect the radial Bulging degree of deformation.