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为研究桥墩桩基础施工过程对地层的影响规律,以成都成温路改造桥梁工程为依托,采用三维有限元分析方法,对桥墩桩基础施工全过程进行模拟。研究桩基施工过程中地层应力状态的变化及桩周水平位移的变化,分别从应力角度和位移角度分析桩基施工对地层产生的影响,得出桩基施工对周围地层的影响范围。结果表明:桩基施工对周围地层的影响范围可近似为平面上以主道、匝道承台中心连线为轴线的跨度约为33.7m灯泡形区域,竖向深度在地面下13m以内。
In order to study the influence law of the pier pile foundation construction process on the formation, based on Chengdu Cheng Weng Road reconstruction bridge project, using the three-dimensional finite element analysis method to simulate the whole process of the pier pile foundation construction. Studying the change of formation stress state and the change of pile horizontal displacement during pile foundation construction, the influence of pile foundation construction on formation is analyzed respectively from the stress angle and displacement angle, and the influence scope of pile foundation construction to the surrounding strata is obtained. The results show that the influence range of pile foundation construction on the surrounding strata can be approximated as the light bulb-shaped area of about 33.7m in the plane with the connecting line of the main track and the ramp cap platform as the axis, and the vertical depth is within 13m under the ground.