软土地层开挖释放荷载引起管棚位移敏感度分析  

Sensitivity analysis of pipe roof displacement induced by released load in excavation of soft ground

作　　者：董新平[1] 周顺华[1] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海200331

出　　处：《岩土工程学报》2005年第11期1296-1299,共4页Chinese Journal of Geotechnical Engineering

摘　　要：针对软土地层浅埋暗挖法施工过程中管棚分析模型,采用解析法推导了释放荷载引起管棚位移对管棚惯性矩的敏感度分析方程,针对目前我国常用的管棚直径情况,对位移敏感度以及影响敏感度主要因素进行了分析,结果表明:管棚直径79～108 mm为敏感度急剧变化范围,在该范围内直径的改变对位移的影响较为显著;直径＞108 mm,直径改变对于位移敏感度影响相对较小;直径＞159 mm,管径的提高对于位移几乎没有影响;棚架体系中,刚度较小的地层改变对位移敏感度影响相对较大.Based on the analytical model of pipe roof applied to the shallow excavation in soft ground, the sensitivity equation of displacement, induced by released load, with respect to the inertia moment of pipe roof was developed. The sensitivity of displacement with respect to moment of inertia of pipe roof and its influential factors were analyzed. It was demonstrated that, when diameter of pipe roof varied from 79 to 108 mm, the sensitivity of displacement varied violently. When pipe diameter was larger than 108 mm, the sensitivity of displacement varied slightly. When the diameter of pipe roof was 159 mm, the increase on diameter had no effect for the displacement. In the pipe-support system, ground condition had more effect on sensitivity of displacement than the support.

关 键 词：隧道工程 浅埋暗挖 管棚 敏感度分析 

分 类 号：TU457[建筑科学—岩土工程]