基于多块体上限法的层状珊瑚砂地基承载力分析

TU470; 为研究层状珊瑚砂地基承载能力,基于极限分析上限理论,构建了适用于层状砂土的多块体破坏机构,推导了外力功率与内能耗散率的计算公式.采用序列二次规划优化算法,建立了层状珊瑚砂地基极限承载力的上限分析方法.通过与现有研究成果的对比分析,验证了所建立方法的有效性,所构建的破坏机构突破了现有分层地基破坏机构下层必须为黏土的局限.结果表明,当破坏机构穿过不同层状地层时,基于层状地基模型与均质地基模型计算得到的地基承载力和临界破坏机构有显著不同,因此有必要考虑不同分层性质.相比于地基载荷试验,所提出的上限分析方法通过调整不同地层土体参数,能够快速得到地基承载力上限值,为珊瑚砂地基设计提供参考....

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Published in东南大学学报（自然科学版） Vol. 54; no. 4; pp. 921 - 928
Main Authors 徐东升, 刘洋, 侯传坦
Format Journal Article
LanguageChinese
Published 武汉理工大学土木工程与建筑学院,武汉 430070 01.07.2024
Subjects
地基承载力
foundation bearing capacity
极限分析
层状珊瑚砂
limit analysis
layered coral sand
multi-block upper bound solution
多块体上限解
Online AccessGet full text
ISSN1001-0505
DOI10.3969/j.issn.1001-0505.2024.04.015

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Abstract TU470; 为研究层状珊瑚砂地基承载能力,基于极限分析上限理论,构建了适用于层状砂土的多块体破坏机构,推导了外力功率与内能耗散率的计算公式.采用序列二次规划优化算法,建立了层状珊瑚砂地基极限承载力的上限分析方法.通过与现有研究成果的对比分析,验证了所建立方法的有效性,所构建的破坏机构突破了现有分层地基破坏机构下层必须为黏土的局限.结果表明,当破坏机构穿过不同层状地层时,基于层状地基模型与均质地基模型计算得到的地基承载力和临界破坏机构有显著不同,因此有必要考虑不同分层性质.相比于地基载荷试验,所提出的上限分析方法通过调整不同地层土体参数,能够快速得到地基承载力上限值,为珊瑚砂地基设计提供参考.
AbstractList TU470; 为研究层状珊瑚砂地基承载能力,基于极限分析上限理论,构建了适用于层状砂土的多块体破坏机构,推导了外力功率与内能耗散率的计算公式.采用序列二次规划优化算法,建立了层状珊瑚砂地基极限承载力的上限分析方法.通过与现有研究成果的对比分析,验证了所建立方法的有效性,所构建的破坏机构突破了现有分层地基破坏机构下层必须为黏土的局限.结果表明,当破坏机构穿过不同层状地层时,基于层状地基模型与均质地基模型计算得到的地基承载力和临界破坏机构有显著不同,因此有必要考虑不同分层性质.相比于地基载荷试验,所提出的上限分析方法通过调整不同地层土体参数,能够快速得到地基承载力上限值,为珊瑚砂地基设计提供参考.
Abstract_FL In order to study the bearing capacity of layered coral sand foundations,a multi-block failure mech-anism suitable for layered sandy soil was constructed based on the upper bound theory of limit analysis.For-mulas for calculating the external work rates and internal energy dissipation rates were established.By introdu-cing a sequential quadratic programming optimization algorithm,an upper limit analysis method for evaluating the ultimate bearing capacity of layered coral sand foundations was established.The established method was validated by comparisons with existing research results.The established failure mechanism overcomes the limi-tation of the existing layered soil failure mechanism,which requires the lower layer to be clay.The results in-dicate that when the failure mechanism traverses different layered formations,the calculated foundation bearing capacity and critical failure mechanism based on the layered foundation model differ significantly from those based on the homogeneous foundation model,which shows that it is significant to consider the diverse strati-graphic properties.Compared with foundation load tests,the adopted upper bound analysis method,by adjus-ting various parameters of different layers of soil,can rapidly obtain the upper limit solution of foundation bearing capacity,providing reference for the design of coral sand foundation.
Author 侯传坦
刘洋
徐东升
AuthorAffiliation 武汉理工大学土木工程与建筑学院,武汉 430070
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Hou Chuantan
Liu Yang
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DocumentTitle_FL Bearing capacity analysis of multi-layered coral sand foundation based on the upper-bound multi-rigid-block approach
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Keywords 地基承载力
foundation bearing capacity
极限分析
层状珊瑚砂
limit analysis
layered coral sand
multi-block upper bound solution
多块体上限解
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