盾构机穿越江河浅覆土层最小埋深的研究  

Research on minimum depth burial of shield tunnel machines crossing over ground base under rivers

作　　者：戴小平[1] 郭涛[2] 秦建设[2] 

机构地区：[1]解放军理工大学理学院,南京210007 [2]河海大学岩土工程研究所,南京210098

出　　处：《岩土力学》2006年第5期782-786,共5页Rock and Soil Mechanics

摘　　要：盾构机穿越江、海、湖泊等浅覆土层时,由于隧道衬砌所受浮力作用,上部覆土厚度极为重要。针对传统上覆土层厚度计算方法中没有考虑土体自身剪切强度对抗浮作用发挥的问题,提出了一个新的覆土厚度计算方法,并通过算例对所提的计算方法与简化计算方法进行对比分析。说明了新的计算方法比传统计算方法更符合实际。最后,通过有限元数值计算浅覆土层的应力、应变情况,进一步验证了该计算方法的合理性。It is very important for the tunnel lining to determine the earth covering thickness as the rising force when the shield tunnel machine crosses over the ground base under rivers, lakes the sea, and so on. The authors bring forward a new method to calculate the earth covering thickness of the tunnel lining .The new method takes into account of the sheafing strength of the soil that can resist the rising force, while the conventional method doesn＇t consider that. The new method is more practical than the conventional method according to the computation in the case study. Finally, the authors analyze the stress and strain in the shallow earth covering by FEM; the result proves that the new method is more reasonable.

关 键 词：盾构隧道 覆土厚度 剪切强度 有限元法 

分 类 号：TV554[水利工程—水利水电工程]