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采用三维数值模拟的方法,对新建桥梁的钻孔灌注桩的施工工程进行计算,预测了其在各步序施工条件下对周围土体应力和变形的影响,并对各施工步序对邻近桩基应力变形的影响进行了分析。结果表明:(1)新建桥台的施工,对既有桥桩的位移和既有桥桩结构的应力有一定影响;(2)各个施工步序对地层应力位移影响较大,基坑下部土体挤入较为严重,特别是靠近既有桥桩的基坑下部挤入值较大;(3)其中第1施工步序和第3施工步序对既有桥桩的应力影响相对于其他步骤较大;(4)在考虑桩基施工对周围土体扰动的情况下,桩基施工对既有桥桩的沉降影响不大。施工建议为:(1)第1施工步序和第3施工步序是核心风险源,需要特别注意施工安全风险;(2)对既有桥桩结构周围土体进行注浆加固;(3)在允许的情况下,提高挡土墙结构和横撑的强度;(4)建立监测预警系统,进行信息化管理。
The three-dimensional numerical simulation method is used to calculate the construction of a newly built bored pile of a bridge, and the prediction of the influence on the stress and deformation of the surrounding soil under each step construction condition is carried out. The construction steps of adjacent bored piles The effects of stress-induced deformation are analyzed. The results show that: (1) The construction of new abutment abutment has some influence on the displacement of existing bridge piles and the stress of existing bridge piles; (2) Each construction step has a great influence on the formation stress displacement, Body crowded into more serious, especially near the existing bridge piles into the lower part of the larger value; (3) of which the first construction step and the third construction step on the existing bridge pile stress relative to other steps Larger; (4) Considering the disturbances of surrounding soil by the pile foundation construction, the pile foundation construction has little effect on the settlement of existing bridge piles. Construction suggestions are as follows: (1) The first construction step and the third construction step are the core risk sources, and special attention should be paid to the construction safety risk; (2) Grouting reinforced soil around the existing bridge pile structure; (3) Where possible, improve the strength of retaining wall structure and cross brace; (4) Establish monitoring and early warning system and carry out information management.