横向荷载下桩侧浅层土体的极限抗力上限分析  

Upper bound limit analysis for limit resistance of pile-side shallow soil under lateral loads

作　　者：丁蓬莱[1] 王小明[1] 

机构地区：[1]中国能源建设集团广东省电力设计研究院,广东广州510663

出　　处：《人民长江》2013年第20期42-45,共4页Yangtze River

基　　金：国家自然科学基金青年科学基金项目(41202163);广东省自然科学基金项目(S2011040005245)

摘　　要：基于塑性极限分析中的上限定理,利用对数螺线夹层破坏机制推导出了考虑水平地震作用受横向荷载下的桩侧浅层土体的水平极限抗力公式,最后根据序列二次规划算法对问题进行优化求解。数值计算结果表明,所提出模型的计算结果与Matlock法和Sullivn法非常接近,证明了所提方法的合理性;水平地震系数对桩侧土体极限抗力有较大的影响。该方法可为桩侧浅层土体极限抗力的设计研究提供参考。Based on the upper bound theorem of plastic limit analysis, the horizontal limit resistance formula of pile - side shallow soil under lateral seismic load is derived by using the logarithmic spiral interlayer mechanism and then the problem is calculated by applying a nonlinear sequential quadratic programming algorithm. The calculations show that the results calculated by the suggested model are perfect consistency with the results calculated by Matlock method and Sullivan method, thus verifying the reasonability of the suggested method. It is found that the horizontal seismic coefficient exerts significant influences on the limit resistance of the pile - side soil. The suggested method provides valuable guidance for limit resistance design of pile - side shallow soil.

关 键 词：上限分析 对数夹层破坏机制 P-Y曲线 极限土抗力 

分 类 号：TV43[水利工程—水工结构工程]