三排微型桩内力分布的数值模拟

该文将强度折减法与有限差分程序FLAC~(3D)相结合,对同一排内均匀布置且具有纵向联系梁的桩心配筋微型桩进行数值分析。在利用实体单元和理想弹塑性本构模型模拟桩体得出加桩边坡的稳定系数后,采用可以直接得到弯矩和剪力等内力的结构单元Pile对桩体进行模拟,Beam单元模拟连系梁,得到了三排微型桩在破坏前不同滑坡推力下的内力分布规律。桩体受最大弯矩与剪力均位于滑带处,滑坡推力较小时第一排桩所受弯矩和剪力最大,第二排其次,第三排最小;滑坡推力较大、接近破坏时最大弯矩分配为第一排最大,第三排其次,第二排最小,剪力为第一排和第三排较大,第二排最小。

Numerical Simulation of Internal Force Distribution of Three-row Micropiles

A row of micropiles with reinforcement centered, evenly arranged and longitudinally connected are numerically analyzed with combined methods of strength reduction and finite difference program FLAC3D. Solid elements and ideal elasto-plastic constitutive model are used to simulate piles and get stability coefficient of slope with piles, structural unite Pile where internal forces like bending moment and shear force are presented is used to simulate pile, and unite Beam is used to simulate connecting beam, internal force distribution rule of three-row micropiles before destruction under different thrust forces is obtained. The pile is under the largest bending moment and shear force in the slip zone, but the first piles under the largest bend- ing moment and shear force are under less slope thrust force with the forces of the second row and the third row ordinally decrease, and when the slope thrust force is comparatively large and close to destruction, the largest bending moment of the first row, the third row and the second row ordinally de- crease and the largest shear force of the first row and the third row is comparatively large then the second row.