水平荷载作用下嵌岩正斜桩受力变形研究

Study on Deformation of Rock-socketed Positive Inclined Pile under Horizontal Load Rats

竖直桩在受到水平荷载后,桩顶会朝着荷载方向倾斜或者由于施工等其他因素而形成正斜桩,然而目前缺乏对水平荷载作用下嵌岩正斜桩受力变形的研究。文中采用有限元数值模拟研究在水平荷载作用下,倾斜角度为0°、10°、20°、30°的正斜桩的桩身水平位移、桩身弯矩与桩身剪力的变化规律,揭示桩身倾斜角度对桩身水平承载性能的影响。结果表明:水平荷载作用下,嵌岩正斜桩的桩身最大水平位移、最大弯矩都随倾斜角增大而减小。桩身最大弯矩出现在距离桩顶1/2H(土层厚度)处,并且大约在该处出现剪力极值。因此,增加水平受荷嵌岩桩桩身上半部刚度可以有效提高水平受荷桩的承载力。

After the vertical pile is subjected to a horizontal load, the top of the pile will tilt toward the load direction or form a positive battered pile due to other factors such as construction. However, there is currently a lack of research on the force and deformation of rocksocketed positive battered piles under horizontal load. Based on this, this paper uses finite element numerical simulation to study the changes in the horizontal displacement, bending moment of the pile and the shear force of the pile with the tilt angle of 0, 10°, 20°, and 30° under the horizontal load. The law reveals the influence of the inclination angle of the pile body on the horizontal load-bearing performance of the pile body under the horizontal load. The results show that under horizontal load, the maximum horizontal displacement and maximum bending moment of the rock-socketed skew piles decrease with the increase of the inclination angle. The maximum bending moment of the pile body appears at a distance of 1/2H(the thickness of the soil layer) from the top of the pile, and the extreme shear force appears approximately there. Therefore,increasing the rigidity of the half of the horizontally loaded rock-socketed pile can effectively improve the bearing capacity of the horizontally loaded pile.