高水压地区地铁衬砌受力特性对比研究

Comparative Study on High Hydrostatic Forces Metro Areas Lining

高水压环境中,衬砌的受力状态关系到地铁施工和运营阶段的安全性。为检验衬砌结构设计的安全性,有必要对抗水压衬砌结构进行内力计算。针对穿越岩溶高水压地区隧道衬砌结构的受力特征,分析四级围岩中不同水压、衬砌厚度、衬砌形状下衬砌的内力,并通过计算控制截面配筋验证是否满足使用要求。有限元分析结果表明,圆形衬砌抵抗水压能力最好,属于理想型抗水压衬砌;水压增大时,可增加圆形衬砌厚度以满足管片受力要求。

The high pressure environment,the stress state of the lining related to the safety of subway construction safety and operational phase,to test the safety of lining structure design,it is necessary to fight against pressure to calculate internal force of lining structure. For high pressure through the karst areas of mechanics characteristic of tunnel lining,analysis of different pressure,different lining thickness,different shapes lining Lining Internal Force four surrounding rock,and through the calculation control reinforcement section verify reinforcement meets requirements,finite element analysis results showed that ： a circular lining ability to resist pressure the best,is the ideal anti-lining water pressure ; when the pressure is increased,the thickness of the lining can be increased to meet the circular segment stress requirements.