基坑悬臂式倾斜支护桩受力特性数值分析

为优化基坑工程中的排桩支护形式,改善支护桩受力特性,对深基坑悬臂式倾斜支护桩进行了三维数值模拟计算与分析,深入研究了基坑悬臂式倾斜支护桩的变形与受力规律,并将所得结果与传统的直立支护桩受力特性进行了对比分析。研究结果表明:倾斜支护桩的桩顶水平位移较传统直立支护桩明显减小,支护桩抗倾覆能力得到了提高;桩身侧移曲线相对平缓,桩体主要发生刚性位移,较直桩支护形式减小了应力集中发生的可能性;桩身弯矩分布更加均匀,正、负弯矩峰值相近,与传统直桩支护形式相比,更充分利用了桩体的材料强度,具有显著的工程应用价值和经济效益。

Study on the Bearing Behavior Charactersitcis of Cantilever Inclined Retaining Pile for Foundation Pit

For the purpose of optimizing single-row pile retaining structure and improving the bearing behavior of the retaining pile,a three-dimensional numerical simulation and analysis on cantilever inclined retaining pile for deep foundation pit was carried out combined with a project case.Then,the load and deformation laws of the cantilever retaining pile were studied and analyzed further.Moreover,the obtained results were compared with the bearing behavior of conventional vertical pile retaining structure.The research results indicate that the pile-top horizontal displacement of the inclined retaining pile can be significantly reduced compared with that of the vertical retaining pile,reflecting that the anti-overturning ability of the retaining pile is improved;lateral displacement curve of the inclined pile is relatively smooth,and the rigid displacement mainly occurs,which lowers the occurrence probability of stress concentration;distribution of the bending moment along the pile shaft is more uniform and the positive bending moment peak is close to that of the negative bending moment,which reflects that for the inclined retaining pile the pile material strength can be utilized more fully and the economic benefits of projects enhanced.