盾构管片钢筋混凝土内衬大型输水隧洞结构研究

Study on large scale water conveyance tunnel structure with shielding segment steel reinforced concrete inner lining

在北京市南水北调配套工程团城湖至第九水厂输水工程(一期)输水隧洞工程中,根据盾构管片钢筋混凝土内衬的结构间连接结构形式的不同,对双层衬砌相互作用模型进行了对比分析。根据所确定的结构模型对不同的力学模型进行分析,确定了北京地区土质条件下的盾构管片内衬钢筋混凝土的力学模型。计算表明,结构控制的内力状态确定为盾构管片为大偏心受压构件,内衬钢筋混凝土结构为小偏心受拉构件。

During the construction of the auxiliary project of the water conveyance tunnel(No.I Phase) from Tuancheng Lake to the Ninth Water Plant for the South-to-North Water Transfer Project in Beijing,a comparative analysis on the model of the interaction between the double lining layers is made in accordance with the different linkage structure forms of shielding segment steel reinforced concrete inner lining.Based on the determined structural models concerned,different mechanics models are analyzed,and then the mechanics model for the shielding segment steel reinforced concrete inner lining under the soil condition within Beijing area is ascertained.The relevant calculation shows that the controlled internal force state of the structure is defined as the shielding segment being used as the large eccentric compression member and then the inner lining steel reinforced concrete structure being used as the small eccentric tension member as well.