软基桥头高填方对桥头桩基破坏影响机理分析

厚层软基桥头附近桩周土体由于桥台填土外荷载作用发生变形或位移,致使桥头附近桩墩被破坏。通过对典型工程案例分析认为,软基中桥头填土路基对邻近桥梁桩基的影响不仅发生在施工期间,而且会在施工期后相当长的一段时间内发生。采用快剪强度指标进行边坡稳定性分析是确定滑移带位置的有效分析方法。在软土地区进行桥头填土时应进行认真详细的勘察,以了解土层情况,并仔细验算不同工况下桥台及台前一定距离内地基的稳定性,从而有针对性地采取相应的土体或结构加强措施。

Analysis of damage mechanism of bridge foundation affected by high filling subgrade

As the result of filling subgrade and outside load,the soil body around the pile near the bridge pier with soft foundation often distorts and displaces.From the case study in the typical engineering the result shows that the influence of filling subgrade in soft foundation near the pier of bridge on the nearby bridge pile foundation takes place both during the construction period and during long time after the construction period.Quick shear strength index is a useful method in confirming the position of slippage belt.During the stability analysis of slope,In order to know the soil condition and it is very necessary to carry out the careful reconnaissance when filling subgrade at pier of bridge in soft clay area.And it is also necessary to test the stability of groundwork of bridge stage and certain range of bridge stage in different working conditions and accordingly corresponding measures should be adopted to strengthen soil body and structure.