【作者】 单华峰； 夏唐代； 俞峰； 邱战洪； 陶海冰； 杨杰；

【Author】 SHAN Huafeng;XIA Tangdai;YU Feng;QIU Zhanhong;TAO Haibing;YANG Jie;Research Center of Costal and Urban Geotechnical Engineering,Zhejiang University;Institute of Coastal Environment and Geotechnical Engineering,Taizhou University;Fangyuan Construction Group Co.,Ltd.;School of Civil Engineering and Architecture,Zhejiang Sci-Tech University;Fangyuan New Materials Co.,Ltd.;

【机构】 浙江大学滨海和城市岩土工程研究中心； 台州学院滨海环境与岩土工程研究所； 方远建设集团股份有限公司； 浙江理工大学建筑工程学院； 方远新材料股份有限公司；

【摘要】 为研究既有建筑地下增层开挖对托换桩桩身屈曲稳定临界荷载的影响,假定桩周土层地基反力系数呈复杂的幂级数分布。以甘水巷3号组团地下室建设工程为背景,采用Winkler弹性地基梁理论建立桩-土体系总势能方程,结合最小势能原理,获得既有建筑地下增层开挖中托换桩桩身屈曲稳定临界荷载表达式,并对其影响因素进行分析。结果表明:不同开挖深度及幂级数对应着不同的收敛半波数;托换桩屈曲稳定临界荷载比随幂级数的增大而急剧增加,随开挖深度的增加而减小;当幂级数为2和3时,其与开挖深度之间的关系基本一致。更多还原

【Abstract】 In order to analyze the influence of excavation beneath existing building on the critical buckling capacity of underpinning pile,the most generalized power distribution of subgrade reaction modulus is assumed.Based on the case history of No.3 subsection of Ganshuixiang construction project,the total potential energy of pile-soil system is established by the theory of Winkler elastic beam.The expression of critical buckling capacity is obtained by the principle of minimum potential energy.Then the influencing factors of critical buckling capacity of underpinning pile are analyzed.The result shows that convergent half-wave number varies with the excavation depth and power;the ratio of critical buckling capacity of underpinning pile increases rapidly with increasing power,while it decreases with an increase in excavation depth;the relationship between power and excavation depth is similar when the power is 2 and 3.更多还原