摘要
圆形竖井支护结构的受力变形特性与一般基坑支护有着显著的差异。结合珠三角水资源配置工程中一超深圆形竖井支护的计算分析,讨论类似问题的有限元法及增量法计算模型及计算方法,并将计算结果与现场实测进行对比,研究此类问题计算模型构建时需考虑的因素,及圆形竖井的变形特性。计算对比表明,无论采用有限元法还是增量法,适当选取计算模型参数,对此问题均可给出较为符合实际的计算结果。圆形地连墙加逆作内衬的支撑方式,可以有力发挥支护墙体的环向支撑作用,特别是在小径深比情况下。墙体内的环向内力主要是轴压力,而竖向内力主要是在地连墙的嵌岩部位发生外侧受拉的较大弯矩,而在此部位上方一定范围发生内侧受拉的较大弯矩。
The mechanical and deformation characteristics of the circular shaft support structure are significantly different from those of general foundation pit support.Combined with the calculation and analysis of an ultra-deep circular shaft support in the water resources allocation project in the Pearl River Delta,the calculation models and calculation methods by finite elements and the incremental method for similar problems are discussed.Comparing the calculation results with the field measurements,the factors to be considered in the construction of calculation model for such problems,and the deformation characteristics of circular shafts are discussed.The computational comparisons show that whether the finite element method or incremental method is adopted,so long as the model and the parameters are properly selected,the calculation results can reasonably in line with the reality.The circular diaphragm wall together with top-down constructed lining can give strong circumferential support of the shaft,especially in the case with a small diameter to depth ratio.The circumferential internal force in the wall is mainly axial pressure,while the vertical internal force is mainly the bending moment,tensile on the outside,occurs in the rock socketed part of the diaphragm wall.And the large bending moment,tensile on the inside,occurs in a certain range above that part.
作者
林世杰
付浩
宋二祥
李支令
陆岸典
杨光华
LIN Shi-jie;FU Hao;SONG Er-xiang;LI Zhi-ling;LU An-dian;YANG Guang-hua(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Guangdong Hydropower Planning and Design Institute Co.,Ltd.,Guangzhou 510635,Guangdong,China;Guangdong Yuehai Pearl River Delta Water Supply Co.,Ltd.,Guangzhou 511458,Guangdong,China;Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,Guangdong,China)
出处
《地基处理》
2023年第3期195-204,共10页
Journal of Ground Improvement
基金
珠三角水资源配置工程首批科研课题(WW2018229)。
关键词
圆形竖井
有限元分析
增量法
地连墙
逆作内衬
circular foundation pit
finite element analysis
incremental method
diaphragm wall
top-down constructed lining
