基桩弹性模量对组合桩复合地基桩土荷载分担比的影响
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(长沙市规划设计院有限责任公司,长沙 410007)[摘要]在分析桩土相互作用的基础上,将柔性桩和天然地基形成的复合地基当作刚性桩的等效天然地基,考虑垫层效应,推导了复合地基在弹性工作阶段桩土的荷载分担比及沉降的解析解,利用解析解编制程序分析长、短桩弹性模量对桩土荷载分担比的影响。分析表明,随长桩弹性模量的增大,长桩的荷载分担比增大,短桩及桩间土的荷载分担比减小, 但长桩的弹性模量大于28 000MPa时,其对桩土的荷载分担比影响较小;随短桩弹性模量的增大,长桩的荷载分担比减小,短桩及桩间土的荷载分担比增大。[关键词]复合地基;组合桩;荷载分担比;弹性模量Influence of elastic modulus of piles on share load ratio between pile and soil of combination-pile composite foundationTang Mingxiong(Changsha Planning & Design Institute Co., Ltd., Changsha 410007, China)Abstract:Regarding the combination-pile composite foundation made up of soft piles and nature soil as the substitute soil among rigid piles and considering cushion effect at the same time, share load ratio and settlement resolution of combination-pile composite foundation were deduced. Then the effect of modulus of piles on the share load ratio is analyzed. It is indicated that the share load of long-pile increases and the share load of cushion and short-pile decreases with the elastic modulus of long-pile increasing. But the influence on share load ratio diminished when the elastic modulus of long-pile is greater than 28 000MPa. The pattern of the short-pile and the soil foundation are contrary to the long-pile in the same conditions.Keywords:composite foundation; combination-pile; share load ratio; elastic modulus作者简介:唐明雄,高级工程师,一级注册结构工程师,Email: hncstmx@sina.com。参考文献[1]周德泉,张可能,刘宏利. 组合桩型复合地基桩、土受力特性的试验对比与分析[J].岩石力学与工程学报,2005,24(5):872-879.[2]陈善雄. 长、短桩相结合的水泥粉喷桩复合地基设计计算方法探讨[J]. 土木工程学报,2002,35(5):79-81.[3]葛忻声,龚晓南.长短桩复合地基设计计算方法的探讨[J].建筑结构,2002,32(7):3-4.[4]池跃君,宋二祥,陈肇元.刚性桩复合地基竖向承载特性分析[J].工程力学,2003,20(4):9-14.[5]GB50007—2002建筑地基基础设计规范[S].北京: 中国建筑工业出版社,2002.[6]JGJ79—2002 建筑地基处理技术规范[S]. 北京: 中国建筑工业出版社,2002.