多元复合地基与筏形基础及上部结构共同作用分析
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摘要
近年来,在地基处理领域的理论研究和实践中,因具有良好的理论基础和技术经济优势,多元复合地基逐渐成为复合地基处理中的一类重要型式,具有宽广的工程应用前景。多元复合地基处理技术是在复合地基处理技术基础上的重要突破,随着工程技术的不断发展,对多元复合地基与筏形基础及上部结构的共同作用进行分析与研究,具有现实的必要性。通过与国内外多元复合地基与筏形基础及上部结构共同作用分析相关课题研究发展趋势的结合,本文在前人的研究基础之上,进行多元复合地基与筏形基础及上部结构共同作用的数值分析,研究了多元复合地基、筏基及上部结构的变化对三者之间共同作用受力的相互影响,并着重于各种情况下多元复合地基不同布桩方式的对比分析,所做的主要工作和相关研究结论如下:
①研究多元复合地基、筏基、上部结构的有限元分析理论,包括相应的本构模型、计算单元、厚板分析理论等,针对散体、柔性、刚性桩三种竖向增强体一元复合地基对上部结构-筏基-一元复合地基共同作用的影响进行了分析,为后面的工作打下了研究基础。
②针对散体-柔性桩、散体-刚性桩、柔性-刚性桩三种组合的二元复合地基对上部结构-筏基-二元复合地基共同作用的影响进行了研究,布桩方式采用“均匀布桩”、“内强外弱”、“外强内弱”、“中部强内外弱”、“中部弱内外强”五种。得出了按筏基沉降、筏基及上部结构内力分布各单项控制指标下最有利至最不利的布桩方式排序。综合比较,“中部弱内外强”的组合方式既可以使筏基沉降减至较低,又能适当减小上部结构及筏基的弯矩值,是一种相对优化的布桩方式。
③针对散体-柔性-刚性桩组合的三元复合地基对上部结构-筏基-三元复合地基共同作用的影响进行了研究,布桩方式采用“均匀布桩”、“外强中柔内弱”、“外强中弱内柔”、“外柔中强内弱”、“外柔中弱内强”、“外弱中强内柔”、“外弱中柔内强”七种。得出了按筏基沉降、筏基及上部结构内力分布各单项控制指标下最有利至最不利的布桩方式排序。综合比较,“外强中弱内柔”的组合方式既可以使筏基沉降减至较低,又能适当减小上部结构及筏基的弯矩值,是一种相对优化的布桩方式。
④选取散体-柔性-刚性桩“外强中弱内柔”组合的三元复合地基作为多元复合地基代表,针对筏基及上部结构对上部结构-筏基-多元复合地基共同作用的影响进行分析,研究了筏基厚度、筏基砼强度及上部结构层数、层高对上部结构-筏基-三元复合地基共同作用的影响规律,并得出了相关可供工程实践参考的结论。
⑤选取散体-柔性-刚性桩上述七种布桩组合的三元复合地基,针对上部不均匀荷载对上部结构-筏基-三元复合地基共同作用的影响进行了计算研究,分析表明,对中部大周边小的不均匀荷载,不同布桩方式各有利弊,综合比较地基沉降及上部结构、筏基弯矩内力,“外弱中柔内强”、“外柔中弱内强”、“均匀布桩”是相对优化的布桩方式。对中部小周边大的不均匀荷载,则“均匀布桩”、“外弱中强内柔”、“外柔中强内弱”是相对较优的布桩方式。
⑥在VC++平台中采用C++语言编制了“多元复合地基与上部结构及筏基共同作用分析”计算程序MSRIAP-2009,该程序可对多高层框架结构与筏基及多元复合地基的共同作用受力问题进行计算分析,在相关工程实践和科研领域中有一定的利用价值。
Multi-element composite foundation is an important breakthrough based on composite foundation theory in the period of from theory to practice with the ground treatment technology and it has sufficient theory evidence and good application prospect. With the continuous development of engineering technology, analysis to interaction of multi-element composite foundation and raft footing and superstructure has realistic necessity. Based on the research of predecessors, numerical analysis research to the interaction of multi-element composite foundation and raft footing and superstructure is preceded. Influence analysis of different pile dispose schemes to the interaction is the emphasis. Corresponding main work and achievements are as follows:
①Multi-element composite foundation, raft footing and superstructure finite analysis theories are investigated, which include the corresponding constitutive model, computation element, thick plate analysis theory and so forth. Point to the influence of three kinds of unitary-element composite foundations that include rigid, soft, granular cases to the interaction of superstructure and footing with unitary-element composite foundation, investigation was carried out. The basis for the succedent research is prepared well.
②Point to the influence of three kinds of two-element composite foundations that include granular-soft pile combination, granular-rigid pile combination, soft-rigid pile combination to the interaction of superstructure and footing with two-elements composite foundation, investigation was carried out. The pile disposal schemes use five modes including 'uniformly-spaced', 'inner part strong and outer part weak', 'outer part strong and inner part weak', 'center part strong with inner and outer part weak' and 'center part weak with inner and outer part strong'. The order of every pile disposal scheme for every single controlling target of raft settlements, raft and superstructure internal moment force from the best case to worst case is obtained. Comparisons show that every pile disposal scheme has its own shortcomings and advantages. Generally, pile disposal mode of 'center part weak with inner and outer part strong' can not only reduce the raft settlements, but also decrease the internal force of superstructure and raft properly and it is a relatively optimal pile disposal mode.
③Point to the influence of three-element composite foundation combined wih granular-soft-rigid pile to the interaction of superstructure and footing with three-element composite foundation, investigation was carried out. The pile disposal schemes use seven modes including 'uniformly-spaced', 'outer part strong and center part soft with inner part weak', 'outer part strong and center part weak with inner part soft', 'outer part soft and center part strong with inner part weak', 'outer part soft and center part weak with inner part strong', 'outer part weak and center part strong with inner part soft' and 'outer part soft and center part soft with inner part strong'. The order of every pile disposal scheme for every single controlling target of raft settlements, raft and superstructure internal moment force from the best case to worst case is obtained. Comparisons show that every pile disposal scheme has its own shortcomings and advantages. Generally, pile disposal mode of 'outer part strong and center part weak with inner part soft' can not only reduce the raft settlements, but also decrease the internal force of superstructure and raft properly and it is a relatively optimal pile disposal mode.
④Select 'outer part strong and center part weak with inner part soft' combination of granular-soft-rigid pile three-element composite foundation as the representative of multi-element composite foundation. Point to the influence of raft footing and superstructure to the interaction of superstructure and footing with multi-element composite foundation, investigation was carried out. Influence law of raft thickness, raft concrete strength, number of superstructure floors and superstructure floor height to the interaction of superstructure and raft foundation with multi-element composite foundation is investigated. Some useful conclusions are obtained.
⑤Point to the influence of asymmetrical loads to the interaction of superstructure and footing with three-element composite foundation, three-element composite foundation wih the abolve seven granular-soft-rigid pile combination modes was choosed. In the center part heavy outside part weak loads distribution case, comparisons show that every pile disposal scheme has its own shortcomings and advantages. Generally, three pile disposal modes of 'outer part weak and center part soft with inner part strong', 'outer part soft and center part weak with inner part strong', 'uniformly-spaced' can not only reduce the raft settlements, but also decrease the internal force of superstructure and raft properly and are the relatively optimal pile disposal modes. In the center part weak outside part heavy loads distribution case, generally, three pile disposal modes of 'uniformly-spaced', 'outer part weak and center part strong with inner part soft', 'outer part soft and center part strong with inner part weak' are the relatively optimal pile disposal modes.
⑥C++ language is used for devise of multi-element composition foundation, superstructure and raft footing interaction analysis program MSRIAP-2009. And the corresponding numerical computation analysis for the interaction of multilayer frame structure and raft footing with multi-element composition foundation can be carried out. The analysis results are available to corresponding science research and engineering practice.
①研究多元复合地基、筏基、上部结构的有限元分析理论,包括相应的本构模型、计算单元、厚板分析理论等,针对散体、柔性、刚性桩三种竖向增强体一元复合地基对上部结构-筏基-一元复合地基共同作用的影响进行了分析,为后面的工作打下了研究基础。
②针对散体-柔性桩、散体-刚性桩、柔性-刚性桩三种组合的二元复合地基对上部结构-筏基-二元复合地基共同作用的影响进行了研究,布桩方式采用“均匀布桩”、“内强外弱”、“外强内弱”、“中部强内外弱”、“中部弱内外强”五种。得出了按筏基沉降、筏基及上部结构内力分布各单项控制指标下最有利至最不利的布桩方式排序。综合比较,“中部弱内外强”的组合方式既可以使筏基沉降减至较低,又能适当减小上部结构及筏基的弯矩值,是一种相对优化的布桩方式。
③针对散体-柔性-刚性桩组合的三元复合地基对上部结构-筏基-三元复合地基共同作用的影响进行了研究,布桩方式采用“均匀布桩”、“外强中柔内弱”、“外强中弱内柔”、“外柔中强内弱”、“外柔中弱内强”、“外弱中强内柔”、“外弱中柔内强”七种。得出了按筏基沉降、筏基及上部结构内力分布各单项控制指标下最有利至最不利的布桩方式排序。综合比较,“外强中弱内柔”的组合方式既可以使筏基沉降减至较低,又能适当减小上部结构及筏基的弯矩值,是一种相对优化的布桩方式。
④选取散体-柔性-刚性桩“外强中弱内柔”组合的三元复合地基作为多元复合地基代表,针对筏基及上部结构对上部结构-筏基-多元复合地基共同作用的影响进行分析,研究了筏基厚度、筏基砼强度及上部结构层数、层高对上部结构-筏基-三元复合地基共同作用的影响规律,并得出了相关可供工程实践参考的结论。
⑤选取散体-柔性-刚性桩上述七种布桩组合的三元复合地基,针对上部不均匀荷载对上部结构-筏基-三元复合地基共同作用的影响进行了计算研究,分析表明,对中部大周边小的不均匀荷载,不同布桩方式各有利弊,综合比较地基沉降及上部结构、筏基弯矩内力,“外弱中柔内强”、“外柔中弱内强”、“均匀布桩”是相对优化的布桩方式。对中部小周边大的不均匀荷载,则“均匀布桩”、“外弱中强内柔”、“外柔中强内弱”是相对较优的布桩方式。
⑥在VC++平台中采用C++语言编制了“多元复合地基与上部结构及筏基共同作用分析”计算程序MSRIAP-2009,该程序可对多高层框架结构与筏基及多元复合地基的共同作用受力问题进行计算分析,在相关工程实践和科研领域中有一定的利用价值。
Multi-element composite foundation is an important breakthrough based on composite foundation theory in the period of from theory to practice with the ground treatment technology and it has sufficient theory evidence and good application prospect. With the continuous development of engineering technology, analysis to interaction of multi-element composite foundation and raft footing and superstructure has realistic necessity. Based on the research of predecessors, numerical analysis research to the interaction of multi-element composite foundation and raft footing and superstructure is preceded. Influence analysis of different pile dispose schemes to the interaction is the emphasis. Corresponding main work and achievements are as follows:
①Multi-element composite foundation, raft footing and superstructure finite analysis theories are investigated, which include the corresponding constitutive model, computation element, thick plate analysis theory and so forth. Point to the influence of three kinds of unitary-element composite foundations that include rigid, soft, granular cases to the interaction of superstructure and footing with unitary-element composite foundation, investigation was carried out. The basis for the succedent research is prepared well.
②Point to the influence of three kinds of two-element composite foundations that include granular-soft pile combination, granular-rigid pile combination, soft-rigid pile combination to the interaction of superstructure and footing with two-elements composite foundation, investigation was carried out. The pile disposal schemes use five modes including 'uniformly-spaced', 'inner part strong and outer part weak', 'outer part strong and inner part weak', 'center part strong with inner and outer part weak' and 'center part weak with inner and outer part strong'. The order of every pile disposal scheme for every single controlling target of raft settlements, raft and superstructure internal moment force from the best case to worst case is obtained. Comparisons show that every pile disposal scheme has its own shortcomings and advantages. Generally, pile disposal mode of 'center part weak with inner and outer part strong' can not only reduce the raft settlements, but also decrease the internal force of superstructure and raft properly and it is a relatively optimal pile disposal mode.
③Point to the influence of three-element composite foundation combined wih granular-soft-rigid pile to the interaction of superstructure and footing with three-element composite foundation, investigation was carried out. The pile disposal schemes use seven modes including 'uniformly-spaced', 'outer part strong and center part soft with inner part weak', 'outer part strong and center part weak with inner part soft', 'outer part soft and center part strong with inner part weak', 'outer part soft and center part weak with inner part strong', 'outer part weak and center part strong with inner part soft' and 'outer part soft and center part soft with inner part strong'. The order of every pile disposal scheme for every single controlling target of raft settlements, raft and superstructure internal moment force from the best case to worst case is obtained. Comparisons show that every pile disposal scheme has its own shortcomings and advantages. Generally, pile disposal mode of 'outer part strong and center part weak with inner part soft' can not only reduce the raft settlements, but also decrease the internal force of superstructure and raft properly and it is a relatively optimal pile disposal mode.
④Select 'outer part strong and center part weak with inner part soft' combination of granular-soft-rigid pile three-element composite foundation as the representative of multi-element composite foundation. Point to the influence of raft footing and superstructure to the interaction of superstructure and footing with multi-element composite foundation, investigation was carried out. Influence law of raft thickness, raft concrete strength, number of superstructure floors and superstructure floor height to the interaction of superstructure and raft foundation with multi-element composite foundation is investigated. Some useful conclusions are obtained.
⑤Point to the influence of asymmetrical loads to the interaction of superstructure and footing with three-element composite foundation, three-element composite foundation wih the abolve seven granular-soft-rigid pile combination modes was choosed. In the center part heavy outside part weak loads distribution case, comparisons show that every pile disposal scheme has its own shortcomings and advantages. Generally, three pile disposal modes of 'outer part weak and center part soft with inner part strong', 'outer part soft and center part weak with inner part strong', 'uniformly-spaced' can not only reduce the raft settlements, but also decrease the internal force of superstructure and raft properly and are the relatively optimal pile disposal modes. In the center part weak outside part heavy loads distribution case, generally, three pile disposal modes of 'uniformly-spaced', 'outer part weak and center part strong with inner part soft', 'outer part soft and center part strong with inner part weak' are the relatively optimal pile disposal modes.
⑥C++ language is used for devise of multi-element composition foundation, superstructure and raft footing interaction analysis program MSRIAP-2009. And the corresponding numerical computation analysis for the interaction of multilayer frame structure and raft footing with multi-element composition foundation can be carried out. The analysis results are available to corresponding science research and engineering practice.
引文
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