复合加载模式下单桩复合筒型基础地基承载力包络线研究

发布时间：2018-05-10 07:04

本文选题：单桩复合筒型基础 + 复合加载　；参考：《岩土力学》2016年05期

【摘要】：海上风力发电机属于高耸结构物,其地基基础不仅要承受上部结构传递的竖向荷载V、水平荷载H,更要抵抗巨大的弯矩荷载M。单桩复合筒型基础是新型的海上风力发电机基础型式,建立复合加载模式下单桩复合筒型基础地基的破坏包络线,并据此评价其稳定性是地基基础设计的重要手段。在Swipe加载方法和固定位移比加载方法的基础上,通过数值分析研究了不排水饱和软黏土中单桩复合筒型基础在V-H、V-M、H-M和V-H-M加载模式下的地基承载力包络线,开展了室内模型试验,验证了数值分析结果的可靠性。研究表明,V-H和V-M加载模式下地基承载力包络线具有对称性,而H-M加载模式下呈非对称性;V-H-M加载模式下地基承载力包络线的形状受弯矩荷载M的影响显著,表现为随着弯矩荷载的增加,V-H平面内的破坏包络线逐渐缩小。实际工程中,可根据受力状态与破坏包络面的相对关系,评价单桩复合筒型基础的稳定性。
[Abstract]:Offshore wind turbine is a kind of towering structure. Its foundation should not only bear the vertical load Vand the horizontal load of the superstructure, but also resist the huge bending moment load M. Single pile composite cylinder foundation is a new type of offshore wind turbine foundation. It is an important method for foundation design to establish composite loading mode and to evaluate the stability of composite cylindrical foundation. On the basis of Swipe loading method and fixed displacement ratio loading method, the bearing capacity envelope of single pile composite cylindrical foundation in undrained saturated soft clay under the loading mode of V-HnV and V-H-M is studied by numerical analysis, and the indoor model test is carried out. The reliability of the numerical analysis results is verified. The results show that the envelope line of foundation bearing capacity is symmetrical under V-H and V-M loading modes, while the shape of foundation bearing envelope line under H-M loading mode is significantly affected by bending moment load M. It is shown that with the increase of bending moment load, the failure envelope in V-H plane decreases gradually. In practical engineering, the stability of single pile composite cylindrical foundation can be evaluated according to the relative relationship between the stress state and the failure envelope surface.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;天津市勘察院;
【基金】：国家自然科学基金创新研究群体科学基金项目(No.51021004) 国家国际科技合作专项项目(No.2012DFA70490)~~
【分类号】：TU476

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