摘要
随着城市化发展,基坑面临的环境越加复杂,对基坑工程的变形控制也愈发严苛。目前,基坑支护结构的设计仍是以强度控制,由于保守设计实际工程往往发生较大变形而未达到设计强度。基于矩阵理论改进里兹法,采用最小势能原理,考虑了支护桩与水平支撑的变形协调条件,获得了支护桩变形的总势能方程,求解了支护桩变形,提出了基于变形控制的基坑支护桩设计方法。最后通过三例典型工程的现场实测数据对理论进行验证,结果表明预测绝对误差随着支护桩的最大变形增大而增大,平均相对误差均在10%最大变形以内。
With the development of urbanization,the environment of foundation pit is becoming more and more complex,and the deformation control of foundation pit engineering has become more and more stringent.At present,the design of foundation pit retaining structure is still controlled by strength,and the design strength in the actual project cannot be reached due to the large deformation of conservative design.Based on the matrix theory and the principle of minimum potential energy,the deformation coordination condition of retaining pile and horizontal support is considered,the total potential energy equation of retaining pile deformation is obtained,and the deformation of retaining pile is solved.A design method of foundation pit retaining pile based on deformation control is proposed.Finally,the proposed design is verified by the field measured data of three typical projects,and the results show that the absolute error of prediction increases with the increase of the maximum deformation of the retaining pile,and the average relative error is less than 10% of the maximum deformation.
作者
万琪伟
丁海滨
万强
徐长节
童立红
Wan Qiwei;Ding Haibin;Wan Qiang;Xu Changjie;Tong Lihong(Jiangxi Key Laboratory of Geotechnical Engineering Infrastructure Safety and Control,East China Jiaotong University,Nanchang 330013,China;Jiangxi Research Center of Underground Space Technology Development Engineering,East China Jiaotong University,Nanchang 330013,China;Jiangxi Survey and Design Institute,Nanchang 330224,China)
出处
《华东交通大学学报》
2023年第4期24-32,共9页
Journal of East China Jiaotong University
基金
国家自然科学基金重点项目(52238009)
江西省自然科学基金揭榜挂帅项目(20223BBG71018)。
关键词
变形控制
最小势能原理
瑞利里兹法
基坑支护桩变形
欧拉梁
silty clay
orthogonal test
soil mixing
curing agent
unconfined compressive strength
microstructure
