岩土工程学报2023，Vol.45Issue(z2)：241-246,6.DOI:10.11779/CJGE2023S20035
盾构近接施工对摩擦桩基承载性能的影响机制及控制技术研究
Mechanism of influences of shield construction nearby friction pile foundation on its bearing capacity and its controlling techniques
摘要
Abstract
Aiming at the disturbance problem of the adjacent friction pile foundation buildings caused by shield tunneling,based on the changes in the stress field of the strata before and after shield tunneling,an analytical calculation model for the bearing capacity of the existing friction pile foundation under the interaction of tunnel,stratum and pile foundation is established,revealing the influence mechanism of shield tunneling on the bearing performance of friction pile foundation.Taking the construction of an old building with friction pile foundation at the side of a subway shield tunnel as the engineering background,the deformation characteristics of the friction pile group under the disturbance of shield tunneling are analyzed,and the effectiveness of ground reinforcement in controlling the deformation of adjacent pile foundations is demonstrated.The research results indicate that the changes in horizontal and shear stresses in the strata after tunnel excavation are the fundamental reasons affecting the bearing performance of friction pile foundations.The loss of bearing capacity of pile foundation is directly proportional to the loss rate of formation during tunnel construction.The ground reinforcement can effectively control the ground loss caused by tunnel construction,thereby reducing the deformations of the ground and the existing pile foundations.关键词
盾构隧道/摩擦桩/承载力/地层加固/桩基变形Key words
shield tunnel/friction pile/bearing capacity/stratum reinforcement/pile deformation分类
建筑与水利引用本文复制引用
林超,姜蓉,肖树聪,王祖贤..盾构近接施工对摩擦桩基承载性能的影响机制及控制技术研究[J].岩土工程学报,2023,45(z2):241-246,6.基金项目
江西省自然科学基金面上项目(20232BAB204074) （20232BAB204074）
中国博士后科学基金面上项目(2023M741158) （2023M741158）
