邻近建筑基坑边坡支护的参数优化

Optimization on parameters of slope support of deep foundation pit adjacent to buildings

为减少基坑开挖对邻近建筑稳定性扰动,文章针对基坑边坡支护,利用Abaqus建立数值模型,综合考虑基坑周边应力分布、区域变形等因素,对比分析不同土钉墙支护方式下的支护效果,讨论了土钉长度、孔径等支护参数。结果表明:阶梯型土钉支护方式能有效地提高边坡土体整体强度,减少边坡应力集中程度,降低边坡土体变形。采用土钉进行边坡支护时,土钉支护参数长度宜为7 m,孔径宜为50 mm,布置方式宜为阶梯型布置。

In order to reduce the disturbance of foundation pit excavation on the stability of adjacent buildings,a numerical model was established using Abaqus for the support of foundation pit slopes.Factors such as stress distribution and regional deformation around the foundation pit were comprehensively considered,and the support effects of different soil nail wall support methods were compared and analyzed.Support parameters such as soil nail length and aperture were discussed.The results show that the stepped soil nail support method can effectively improve the overall strength of the slope soil,reduce the degree of stress concentration on the slope,and reduce the deformation of the slope soil.When using soil nails for slope support,the length of soil nail support parameters should be 7 m,the aperture should be 50 mm,and the layout should be stepped.