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CFG桩复合地基加固深厚软基理论研究与工程应用【作者】唐彤芝 【导师】赵维炳

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#m)P"_ `3ZQc]0CFG桩复合地基加固深厚软基理论研究工程应用

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HFIQ[(Ig0【作者】唐彤芝导师赵维炳水利论文T+U,S6rg-VT L-q&e^8T
【作者基本信息】南京水利科学研究院,岩土工程,2007年,博士水利论文 [.l1@?b}Rb8s-z Yl

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A3Q5o3L4vm:V1L;Vp0【中文摘要】 本文结合数项国家和省部级重点科研项目,以控制工后沉降地基处理新思路为指导,以超软深厚软土地基为对象,较为系统地对处理深厚超软地基的CFG桩复合地基技术进行理论研究和工程实践分析。全文研究工作和成果主要体现在现场试验、室内模型试验、理论分析和数值计算四大方面。现场试验研究工作主要包括:(1)详细分析依托工程试验段的工程地质状况,根据常规方法进行分析计算确定CFG桩复合地基施工工艺和设计参数;(2)根据现场测试和质量检测结果综合分析评价深厚超软地基中CFG桩成桩质量和加固效果;(3)基于现场实测资料,较为系统地研究路堤荷载作用下CFG桩复合地基的沉降、孔压、桩土应力分布、桩身应力传递和地基承载力等性状。室内模型试验研究工作主要包括:(1)基于几何相似条件进行模型设计与模型制备;(2)实际成桩过程的模拟及挤土效应分析;(3)通过应力变形测试和载荷试验研究不同桩长和间距的CFG模型桩的变形和承载力性状、桩土应力分布和荷载传递规律等。特别是研究并揭示实际工程中难以做到的浮桩的各项性状。理论分析和数值计算研究工作主要包括:(1)基于圆孔扩张理论和相关工程实测资料研究CFG桩沉管引起的超静孔压的消散...更多规律;(2)基于轴对称砂井固结理论,考虑初凝期桩体排水功能和渗透性随时间的变化,建立CFG桩初凝期桩间土固结解析解;通过实例计算研究初凝期桩间土超静孔压的消散变化规律;借助已有方法估算CFG桩沉管挤土位移和地表隆起,根据理论计算和现场实测结果指出桩间土挤密效应明显,挤密主要来自初凝期桩体的排水功能,该结论突破“在饱和软粘土地基中沉管施工基本不产生挤密效应”的传统观点;(3)基于Terzaghi一维固结理论和谢康和的双层地基固结理论,在前人的研究基础上,详细推导并建立路堤荷载作用下不同工况的CFG桩复合地基固结解析解,编制计算程序进行实例分析,综合研究CFG桩复合地基固结特性,进一步发展复合地基固结理论。从地基固结的角度对工程设计和施工提出合理性建议;(4)提出CFG桩平面群桩有限元分析方法,进行实例计算验证其合理性和正确性;基于有限元数值计算深入研究路堤荷载作用下不同设计参数的CFG桩复合地基的荷载传递和变形规律;(5)将CFG桩复合地基工后沉降分成加固区未完成的主固结沉降、下卧层未完成的主固结沉降和整个土层的次固结沉降三部分,考虑软土的固结流变特性,提出控制工后沉降的设计计算方法,实例验证其可行性和合理性。  还原

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9g@ L-^N%CZ5TLz0【英文摘要】 Based on the idea of controlling post-construction settlement, theoretical study andengineering practice of CFG pile composite foundation for thick and soft ground treatment isintroduced combined with some main scientific and research project in this paper. The researchand achievement mainly embodied in four aspects: the field test, the laboratory model test, thetheoretical analysis and the numerical calculation.The field test research includes the following works: the engineering geological charactersof the test section are analyzed in detail and the construction technique and the design parametersof the CFG pile composite foundation are determined according to the conventional method; thequality of the CFG pile and the effect of reinforcement are analyzed according to the field testand quality test results; the settlement, the pore water pressure, the stress distribution of pile andsoil, the stress transfer mechanism and the bearing capacity of CFG composite foundation underembankmen...更多t load are analyzed according to the test results.The laboratory model test research includes the following works: the design and preparationof the laboratory model according to geometrically similarity criterion; the simulation of theprocess that forming the piles and analysis of the soil-squeezing effects; The behaviors of thedifferent length and space model piles such as the deformation, the bearing capacity, the stressdistribution and the stress transfer mechanism are studied through stress-deformation test andload test, especially for the partially penetrated CFG piles.The theoretical analysis and the numerical calculation includes the following works: thestudy of the increment and dissipation of the excess pore water pressure based on the theory ofcavity expansion and relative field test results, the establishment of the analytical consolidationtheory of the early setting period of the CFG piles based on the axisymmetric sand drainconsolidation theory considering of the changing of the permeability, the calculation of theincrement and dissipation of the excess pore water pressure of soil in early setting period, theestimation of the soil compaction displacement and ground bulging in the period of constructionof CFG piles based on the existing method; the derivation and establishment of the analyticalconsolidation theory of CFG pile composite foundation in different conditions under the load ofembankment based on one-dimensional consolidation theory and double-layered groundconsolidation theory; the numerical simulation and verification based on plane finite elementanalysis of pile groups; the study of the load transfer and deformation in different designparameters of CFG pile composite foundation under the load of embankment based on theanalysis of finite element method; the research and verification of the design calculation methodof controlling post-construction settlement of CFG pile composite foundation based on the ideaof the post-construction settlement is composed of the unfinished primary consolidationsettlement of the reinforced field, the unfinished primary consolidation settlement of underlyingfield and the secondly consolidation settlement of the reinforced and underlying field.  还原水利论文vZS%Y+}

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【中文关键词】 CFG桩; 软土地基; 模型试验; 荷载传递; 固结; 工后沉降水利论文-hTrJx(~C
【英文关键词】 CFG pile; soft ground; model test; load transfer; consolidation; post-construction settlement
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TAG: 导师 赵维炳 唐彤芝 CFG 地基加固
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