南昌地区砂-岩复合地层深基坑嵌岩支护性能分析
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摘要
为研究南昌地区砂-岩复合地层深基坑嵌岩支护性能,选取23个嵌岩支护的基坑工程进行统计分析,并且对地层分布及基坑支护侧移规律进行了系统研究;并以一嵌岩支护的深基坑工程为例,采用有限元数值分析方法,对基坑土体与围护结构变形特性进行了分析。结果表明:南昌地区地层分布表现出一定的规律性,经线性拟合得到的基坑支护最大侧移值上下限区间为0.013%～0.454%倍的基坑开挖深度,均值达0.098%倍的基坑开挖坑深度;大体积土方开挖下,土体沉降与回弹显著,上部土体朝向基坑内侧发生侧移,出现圆弧状软弱滑动带;支挡结构在砂土层中位移发展迅速,在岩层中变形速率相对较缓,围护结构侧向变形沿地层深度表现差异明显。
In order to study the rock-socketed supporting performance of deep foundation pit of sand-rock composite stratum in Nanchang,the statistics and analysis of 23 rock-socketed supporting performances,the stratigraphic distribution and the lateral displacement of foundation pit support were systematically studied.In the case of deep foundation pit project supported by a rocksocketed,the finite element analysis method was adopted to analyze the deformation characteristics of soil body and retaining structure of foundation pit.The results showed that the stratigraphic distribution in Nanchang area shows certain regularity.The maximum lateral movement valueδhmof the foundation pit support by linear fitting ranges in 0.013%-0.454%of the depth of the foundation pit and the average value is up to 0.098%of the depth of the foundation pit.With large-volume earth excavation,the soil body showed obvious sedimentation and resilience and the upper soil body have sideways towards the foundation pit.The arcshaped weak slip band appeared.Displacement support structures in the sandy soil layer have been in the rapid development with slower deformation rate in the stratum.The lateral deformation of retaining components showed significant differences along the depth of the stratum.
In order to study the rock-socketed supporting performance of deep foundation pit of sand-rock composite stratum in Nanchang,the statistics and analysis of 23 rock-socketed supporting performances,the stratigraphic distribution and the lateral displacement of foundation pit support were systematically studied.In the case of deep foundation pit project supported by a rocksocketed,the finite element analysis method was adopted to analyze the deformation characteristics of soil body and retaining structure of foundation pit.The results showed that the stratigraphic distribution in Nanchang area shows certain regularity.The maximum lateral movement valueδhmof the foundation pit support by linear fitting ranges in 0.013%-0.454%of the depth of the foundation pit and the average value is up to 0.098%of the depth of the foundation pit.With large-volume earth excavation,the soil body showed obvious sedimentation and resilience and the upper soil body have sideways towards the foundation pit.The arcshaped weak slip band appeared.Displacement support structures in the sandy soil layer have been in the rapid development with slower deformation rate in the stratum.The lateral deformation of retaining components showed significant differences along the depth of the stratum.
引文
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