前排倾斜双排桩支护性状有限元分析
摘要：利用有限元软件，针对倾斜双排桩组合形式、前排倾斜双排桩前桩材质与倾角、坑内留土高度与宽度等参数，分析其对倾斜双排桩支护效果的影响，得出一些关于前排倾斜双排桩性状的结论：在倾斜双排桩的组合形式中，后桩垂直前桩外倾双排桩的支护效果较为理想，在综合考虑造价与施工空间后，可作为最优倾斜双排桩组合形式；前排倾斜双排桩前桩桩身弯矩反弯点在0.5L～0.6L深度处，反弯点以上桩身后侧受拉，反弯点以下桩身前侧受拉；开挖较深时，前排倾斜桩采用钢管混凝土桩(劲性结构)与混凝土桩较为理想；整体位移随前桩倾斜角度增大逐步减小并收敛，且在倾角逐步增大时桩身弯矩逐步减小，主要因角度增大后前排桩除抗弯外，还提供了支撑作用；前排桩桩身最大位移随留土高度与宽度的增加呈现二次函数减小，弯矩随留土高度与宽度增加呈现线性减小。
关键词：基坑支护双排桩倾斜桩位移有限元分析
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[2] 龚晓南.关于基坑支护的几点思考[J].土木工程学报，2005,38(9):99-102.
[3] 郑刚，白若虚.倾斜单排桩在水平荷载作用下的性状研究[J].岩土工程学报，2010,32(S1):39-45.
[4] 徐源，郑刚，路平.前排桩倾斜的双排桩在水平荷载下的性状研究[J] .岩土工程学报，2010,32(S1):93-98.
[5] 郑刚，李欣，刘畅，等.考虑桩土相互作用的双排桩分析[J].建筑结构学报，2004,25(1):99-106.
[6] 蔡袁强，赵永倩，吴世明，等.软土地基深基坑中双排桩式围护结构有限元分析[J].浙江大学学报：自然科学版，1997,31(4):442-447.
[7] 王丽.竖向荷载下轻微倾斜桩及倾斜荷载下竖直桩工作机理研究[D].天津：天津大学，2008.
[8] 王卫东，徐中华.基坑工程技术新进展与展望[J].施工技术，2018,47(6):53-65.
[9] 黄晓程，张松波，邓昌福，等.前排倾斜桩参数对双排桩支护效果影响分析[J].施工技术，2020,49(1):29-32,37.
Finite Element Analysis of Supporting Behavior About Front Row Inclined of Double-row Piles
Abstract: In this paper, the finite element software is used to analyze the influence of the inclined double-row pile combination, the material and inclination angle of the pile in front of the inclined double-row pile, the height and width of the soil in the pit, and the effect on the supporting effect of the inclined double-row pile. Some conclusions about the behavior of the front row inclined of double row piles are obtained. In the combination of inclined double-row piles, the supporting effect of the double piles of rear pile vertical and front pile inclined is ideal, after considering the cost and construction space comprehensively, it can be used as the optimal inclined double-row pile combination. The zero point of bending moment of front row inclined of double row pile is at 0.5L～0.6L, below the excavation surface, above the zero point of bending moment the back side of the pile is pulled, follow the zero point of bending moment front side of the pile is pulled. When the excavation is deep, the front row inclined piles are ideal for the use of concrete-filled steel tubular piles(rigid structures) and concrete piles. The overall displacement gradually decreases and converges with the increase of the inclination angle of the front pile, and the bending moment of the pile body gradually decreases as the inclination angle increases gradually. The angle of the front row pile provides a supporting effect in addition to the bending resistance. The maximum displacement of the pile in the front row decreases as quadratic function with the increase of the height and width of the soil, and the bending moment decreases linearly with the increase of the soil height and width.
Keywords: foundation excavation; supports; double-row piles; inclined pile; displacement; finite element analysis
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