【摘要】 运用有限元软件ABAQUS建立桩基础与桩筏基础模型，通过控制桩长、桩数、竖向荷载及桩间距，对其施加水平荷载进行全过程模拟，分析受荷过程中桩体水平位移变化、桩身弯矩和剪力变化及土体变形规律。模拟结果表明：相同水平荷载作用下，桩基础的桩体水平位移随荷载增大而增大，以桩底为旋转中心发生破坏；桩筏基础由于筏板的作用，倾斜非常小，群桩较单桩有更好的稳定性。桩基础的桩周土塑性区域明显大于桩筏基础，二者在荷载作用下土体均会出现土拱效应，但桩基础的土拱效应更明显；桩基础的桩底会出现塑性区域，桩筏基础几乎不会出现，桩数的增加会减小塑性区域范围。桩基础的最大弯矩均出现于0.8倍桩身处，桩筏基础的最大弯矩出现在0.2倍桩身处。桩基础和桩筏基础最大正剪力出现在桩顶和桩底附近，最大负剪力出现在桩身中部。桩筏基础弯矩值和剪力值都小于桩基础，因此桩筏基础具有更好的抗弯、抗剪能力。更多还原

【Abstract】 The pile foundation and piled raft foundation model are simulated by ABAQUS. With pile length,pile number, vertical load and pile spacing under control, the whole process of horizontal loading is simulated.The pile horizontal displacement during the loading process, pile bending moment and shear force, soil displacement field and plastic deformation development are analyzed. The simulation results show that the horizontal displacement of the pile foundation increases with the horizontal load, and failure occurs with the pile bottom as the rotating center, under the same horizontal load. The piled raft inclination is very small due to the action of the raft, and the pile group has better stability than a single pile. The plastic zone area of the soil around the pile foundation is obviously larger than that of the piled raft foundation, both of which have the soil arching effect. The soil arching effect of the pile foundation is more obvious than that of piled raft. The plastic zone area appears in the pile bottom of the pile foundation, and piled rafts almost do not appear. An increase in the pile number can reduce the range of the plastic zone areas. The maximum bending moments of the pile body in the pile foundation appear at 0.8 times the pile length but appear at 0.2 times the pile length in the piled raft. The maximum pile positive shear force of the pile and piled raft appears near the pile top and pile bottom, respectively, and the maximum pile negative shear force appears in the middle of the pile body.The bending moment and shear force of the piled raft are smaller than those of the pile foundation under the same horizontal load, which indicates that the piled raft foundation has better bending and shear resistance.更多还原