考虑地质影响的深基坑复合土钉墙最优支护参数选择技术

Selection of Optimal Supporting Parameters of Composite Soil Nailing Wall for Deep Foundation Pit Considering Geological Influence

通过勘察一区域综合办公写字楼主楼获取土层详细指标,利用土钉抗力参数计算选取最佳土钉墙材料,并设计深基坑复合土钉墙支护方案与施工流程。将设计好的施工方案输入到FLAC3D软件中模拟深基坑支护结构,模拟不同地质影响下的侧压力系数。经试验验证:当土钉参数为5排、钢管嵌固深度参数为2 m时,支护结构可以最大程度降低深基坑的水平位移与沉降;在侧压力系数较大情况下,可以保持较低的竖直位移与深基坑坑底隆起值,具有较好的支护效果。

By surveying the main building of a comprehensive office building in a certain area to obtain detailed soil layer indicators,using soil nail resistance parameters to calculate and select the optimal soil nail wall material,and designing a deep foundation pit composite soil nail wall support scheme and construction process.Input the designed construction plan into FLAC3D software to simulate the deep foundation pit support structure and the lateral pressure coefficient under different geological influences.Experimental verification:When the soil nail parameters are 5 rows and the steel pipe embedding depth parameter is 2 meters,the support structure can minimize the horizontal displacement and settlement of the deep foundation pit to the greatest extent;When the lateral pressure coefficient is large,it can maintain a lower vertical displacement and deep foundation pit bottom uplift value,which has a good support effect.