基于圆孔扩张理论的筋箍碎石桩承载力计算方法研究

发布时间：2018-01-21 22:59

本文关键词： 筋箍碎石桩承载力圆孔扩张理论最优加筋深度　出处：《岩土工程学报》2017年10期 　论文类型：期刊论文

【摘要】：碎石桩沿桩身围裹一圈土工格栅后成为筋箍碎石桩,其受力机理变得更加复杂,筋材特性必定会对桩体承载力产生影响。基于圆孔扩张理论,合理假设单桩有效加固范围边缘土压力为静止土压力,获得了可考虑筋箍与桩、土协调变形的筋箍碎石桩复合地基极限承载力计算方法,并结合工程实例与现有研究成果对该计算方法进行对比验证,结果表明该方法与实际工程吻合性更高,最后,在该方法的基础上,分析了各参数对筋箍碎石桩复合地基承载力的影响,分析结果表明:筋箍碎石桩的最优加筋深度不是一个定值,而是随着筋材性能和桩周土体条件的变化而变化。
[Abstract]:The gravel pile is formed into a reinforced band gravel pile after a circle of geogrid along the pile body. The mechanical mechanism of the pile becomes more complex and the characteristics of the reinforcement must have an impact on the bearing capacity of the pile. Based on the theory of circular hole expansion. The calculation method of ultimate bearing capacity of reinforced gravel pile composite foundation is obtained by reasonable assumption that the boundary soil pressure is static earth pressure in the effective reinforcement range of single pile, and the ultimate bearing capacity of composite foundation can be considered by considering the deformation of reinforcement hoop, pile and soil. Combined with engineering examples and existing research results to verify the calculation method, the results show that the method is more consistent with the actual project. Finally, on the basis of the method. The influence of the parameters on the bearing capacity of the composite foundation is analyzed. The results show that the optimum reinforcement depth of the reinforced gravel pile is not a fixed value. But with the change of reinforcement properties and soil conditions around the pile.
【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(51478178,51208191)
【分类号】：TU473.1
【正文快照】： 在软土地基处理中,碎石桩因具有工程性能良好、造价低廉、施工简单等优点而得到了广泛应用,因其易发生鼓胀破坏,Van Impe[1]首先提出在碎石桩顶部沿桩身围裹一圈筋材,形成“筋箍碎石桩”,能有效提高碎石桩承载力,随后国内外学者利用不同的研究手段,对筋箍碎石桩展开了研究[2-4

【相似文献】