基于薄板理论的刚性桩网复合地基桩土应力比计算

发布时间：2018-06-29 12:51

本文选题：基础工程 + 刚性桩网复合地基　；参考：《岩石力学与工程学报》2017年08期

【摘要】：桩土应力比是反映刚性桩网复合地基工作特性的重要指标。根据刚性桩网复合地基的荷载传递特点,对其在路堤填土荷载作用下的桩土应力分担比进行研究。根据加筋垫层桩桩间土应力和位移连续条件,将加固区视为整体进行研究。结合加筋垫层的应力应变特点,选用大挠度薄板理论模拟加筋垫层的受力和变形。考虑加筋垫层的真实边界条件,首先假定加筋垫层四角点简支其余位置自由并进行桩土应力比求解。在该假定基础之上,考虑桩土相互作用影响,通过功能原理推导出真实情况下刚性桩网复合地基的桩土应力比计算方法。采用室内足尺试验对计算方法进行验证,并综合分析褥垫层模量、桩间距、土体基床系数和桩径对桩土应力比的影响。结果表明理论计算结果与试验结果较为吻合,可为工程实践提供参考。
[Abstract]:The pile-soil stress ratio is an important index to reflect the working characteristics of rigid pile-net composite foundation. According to the load transfer characteristics of rigid pile-net composite foundation, the pile-soil stress-sharing ratio under embankment loading is studied. According to the continuous condition of soil stress and displacement between reinforced cushion pile and pile, the strengthened area is considered as a whole. Combined with the stress and strain characteristics of reinforced cushion, large deflection thin plate is used to simulate the stress and deformation of reinforced cushion. Considering the real boundary conditions of reinforced cushion, it is assumed that the rest of the simply supported position at the four corners of the reinforced cushion is free and the pile-soil stress ratio is solved. On the basis of this assumption and considering the influence of pile-soil interaction, a method for calculating the pile-soil stress ratio of rigid pile-net composite foundation under real conditions is derived by the functional principle. The calculation method is verified by indoor full-scale test, and the effects of cushion modulus, pile spacing, soil bed coefficient and pile diameter on pile-soil stress ratio are analyzed synthetically. The results show that the theoretical results are in good agreement with the experimental results, which can be used as a reference for engineering practice.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;华电重工股份有限公司;天津城建大学天津市软土特性与工程环境重点实验室;
【基金】：国家自然科学基金资助项目(41402263)~~
【分类号】：TU473.1

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