柔性基础下碎石桩复合地基桩土应力比及沉降计算

发布时间：2018-01-31 18:19

本文关键词： 碎石桩复合地基径向位移荷载传递桩土应力比沉降　出处：《岩土工程学报》2017年09期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The stress and deformation mechanism of gravel pile composite foundation under flexible foundation is deeply studied. Considering the lateral bulging of pile and the integrity of pile body, the influence of cross-section shear stress is introduced in the radial displacement model analysis. Then, combined with the load transfer law of pile body, the differential equation of controlling swelling deformation of gravel pile under flexible foundation is derived. The pile-soil stress ratio and settlement of gravel pile composite foundation under flexible foundation are obtained. Finally, through the example and numerical simulation analysis, it is proved that the method is reasonable and feasible, and the parameter analysis shows that the method is reasonable and feasible. Increasing the pile-soil modulus ratio and reducing the replacement ratio will increase the pile-soil stress ratio and the load level will affect the degree of radial bulging and deformation.
【作者单位】：湖南大学岩土工程研究所;
【基金】：国家自然科学基金项目(51478178) 国家青年自然科学基金项目(51508181)
【分类号】：TU433;TU473.1
【正文快照】： 近年来,碎石桩复合地基因其较好的经济效益和处治效果,被广泛使用于公路、铁路的软土地基处理中。伴随着应用的日益广泛,关于其设计计算理论的研究也日渐增多,尤其在是桩土应力比与沉降计算方面,国内外学者取得了较为丰富的成果。国内外部分学者,从等应变假设出发,形成了一系

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