顶管施工环境影响的二维有限元计算分析  

2-D element analysis of environmental effect caus ed by pipe jacking

作　　者：冯海宁[1] 温晓贵[1] 龚晓南[1] 

机构地区：[1]浙江大学岩土工程研究所,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2003年第4期432-435,444,共5页Journal of Zhejiang University：Engineering Science

摘　　要：通过建立二维有限元模型,计算了顶管施工中由于开挖支护作用,对土体变形和管道体应力所产生的影响并与现场试验所测得的地表变形进行了对比.通过有限元模拟,探讨了管道在偏斜5、8、10cm时所对应的管道的内力变化情况,并计算了偏斜不同量值时的地表变形情况,同时研究了顶管上层土体加固不同深度和宽度措施对减小地表变形的作用,经研究表明:偏斜对土体变形有很大的影响,通过土体加固措施,可减小地表土体的变形.A 2 dimension finite element model developed by the authors was used to calculate the deformation in the soil and the stress in the pipe due to caving and timbering. The calculated deformation was c o mpared with one obtained by in site test. The stress and moment change for devia tion of 5 cm,8 cm and 10 cm in the pipe was discussed on the basis of finite element s imulation, and the earth surface deformation change on the cr oss section for deviation of 5 cm, 8 cm, 12 cm was calculated to give the figure of earth surface deformation on the cross section. Furthermore, the decrease o f earth surface deformation by reinforcing soil and the effect of different soi l reinforcement depth and width on earth surface deformation were investigated in this study. The obtained results showed that the deviation had obvious impa ct on earth deformation, and that by reinforcing soil, the deformation can be de creased.

关 键 词：顶管施工 环境影响 二维有限元分析 地表变形 土体加固 地表沉降 管道施工 内力 

分 类 号：TU991.36[建筑科学—市政工程]