基于MIDAS的抗滑桩三维数值模拟及优化

某港区护岸工程区域的地质条件较差，软土层较厚，岸坡整体稳定性不满足要求，采用抗滑桩进行加固处理。基于MIDAS GTS NX软件，建立三维有限元模型，根据边坡不打抗滑桩情况下的等效塑性应变云图，确定抗滑桩桩长，分析不同桩型、桩径、桩距、平面位置下的桩内力、整体稳定系数及工程费用，选择最优的抗滑桩布置方案。结果表明，桩距在3.5D范围内，桩弯矩随着间距增大而增加，桩距达到3.5D后，桩弯矩不再显著增加；桩距在3.5D范围内，岸坡整体稳定系数随桩距增大无显著变化，超过3.5D后会逐渐降低；抗滑桩能有效改变岸坡的塑性区分布，整体稳定性提高了近30%。

Three-dimensional numerical simulation and optimization of anti-slide pile based on MIDAS

Because of the poor geological conditions and thick soft soil layer,the overall stability of the revetment slope in a port area is not satisfactory.Anti-slide pile is adopted for reinforcement treatment.Based on the software of MIDAS GTS NX,we establish a 3D finite element model,determine the length of the anti-slide pile according to the equivalent plastic strain cloud diagram of the slope without anti-slide pile,and select the optimal arrangement of anti-slide pile according to the results of internal force of pile,overall stability coefficient and project cost under different pile types,pile diameters,pile distances and pile positions.The results show that,when the pile distance is within the range of 3.5D,the pile bending moment increases with the increase of the pile distances.When the pile distance reaches 3.5D,the pile bending moment does not increase significantly.Within the pile distance range of 3.5D,the overall stability coefficient does not change significant with the increase of pile distance while gradually decreases after 3.5D.The anti-slide pile can effectively change the plastic zone distribution of the revetment,and the overall stability improves by nearly 30%.