某深基坑支护结构变形影响参数研究

Study on Deformation Affecting Parameters of the Deep Foundation Pit Supporting Structure

以厦门地铁4号线蔡翔区间工程为依托,通过对比有限元软件MIDAS GTS模拟结果与现场监测数据,研究了不同搅拌桩直径、不同型钢型号对软土深基坑SMW工法支护结构位移变形的影响;选取3个监测点位的位移变化值与实际监测值进行对比分析,结果显示此模型具有可行性。得出结论:保持支护结构相关设计参数不变,SMW工法支护结构的最大位移变形随着搅拌桩直径的增大而减小,增大搅拌桩直径能够较好地提高支护结构抵抗位移变形的能力;SMW工法支护结构的最大位移变形随着型钢截面尺寸的增大而减小,增加型钢截面尺寸到一定程度后最大位移变形减小程度已不明显,该研究结果对类似软土深基坑设计具有借鉴意义。

Based on the Caixiang section project of Xiamen Metro line 4,by comparing the simulation results of MIDAS GTS with the field monitoring data,the influences of different stirring pile diameters and different steel shapes on the displacement and deformation of SMW support structure of soft soil deep foundation pit were studied.The displacement variation values of three monitoring points were selected for comparative analysis with the actual monitoring values.The results show that this model is feasible.Conclusion keeping the design parameters of the supporting structure unchanged,the maximum displacement and deformation of the SMW support structure decreases with the increase of the diameter of the stirring pile,Increasing the diameter of mixing pile can improve the ability of supporting structure to resist displacement and deformation.The maximum displacement deformation of SMW support structure decreases with the increase of section size of section steel.When the section size of section steel is increased to a certain extent,the extent of displacement deformation reduction is not obvious.The results are significant for the design of deep foundation pit with similar soft soil Key words soil mixing wall;Deep Foundation Pit;site monitoring;Simulation results;deformation.