软基中桥头路基对邻近桥桩的影响分析

软土地基中桥头路基填土造成了软土层不断被压缩和被侧向挤出,对邻近桥桩产生侧向压力,并导致桩身挠曲,使之成为被动桩。在各国学者的研究成果基础上,建立FLAC3D数值模型,进行被动桩与土体相互作用分析,从桥头路基的填筑高度、速率、软土层的压缩模量以及路基距离等因素对邻近桥桩力学性状进行探讨,得出了路基填筑对邻近桥桩桩身位移、弯矩和桩侧反力的变化规律,并提出了有效的处理措施。得出的结论和规律对施工方案的确定和预测施工过程中出现的问题,具有一定的指导作用。

Analysis on the Influence of Approach Roadbed on Adjacent Bridge Piles in Soft Clay Foundation

In soft layers, because of the soil filling of approach roadbed, the soft soils are compressed and squeezed out laterally, resulting in the lateral pressure and the pile deflection in adjacent bridge piles and making the piles become passive ones. On the basis of the results of research made by scholars at home and abroad, the FLAC^3D numerieal model was set up to analyze the interaction between the passive pile and soil. The mechanical properties of adjacent bridge piles were discussed from such factors as the filling height and filling speed of the roadbed, the compression modulus of soft layers as well as the roadbed distance and it obtained the changing rules including the displacements of pile bodies in adjacent bridge piles, the bending moment and the lateral force of the piles caused by the roadbed filling,and provided many effective countermeasures. The conclusions and rules obtained in the paper are of guiding effect in determination of the construction plan and prediction of the problems to be induced in construction process.