水工有压隧洞单双筋衬砌结构弹性应力分析  

Elastic Stress Analysis of Hydraulic Pressure Tunnel with Single-and Double-Layer Reinforced Concrete Lining Structure

作　　者：刘建强[1] 张秀芳[1] 

机构地区：[1]大连理工大学土木水利学院,辽宁大连116024

出　　处：《水电能源科学》2009年第2期112-115,共4页Water Resources and Power

基　　金：国家自然科学基金资助重点项目(50438010);国家重点基础研究发展规划基金资助项目(2002CB412709)

摘　　要：根据弹性力学理论分别推导了裂缝贯穿衬砌后水工有压隧洞单双筋衬砌结构在不同内水压力下的结构应力计算公式,给出了开裂半径与内水压力的关系式并对完成的大比尺试验模型进行了理论计算。由计算结果发现,裂缝贯穿衬砌后内水压力主要由围岩和衬砌内的环向钢筋承担,且在内水压力下单双筋衬砌结构的钢筋应力、围岩应力及开裂半径差异不大,表明衬砌内环向钢筋的主要作用是限制衬砌裂缝开度、确保衬砌完整性,围岩为主要承载体。在水工有压隧洞衬砌结构中,在确保裂缝宽度下配置单层钢筋更为经济。The calculation formulae of stress analysis of two typical lining structures, i. e. , single-layer reinforced concrete and double-layer reinforced concrete in hydraulic pressure tunnel structures under the water pressure,are deduced, and the relationship between water pressure and cracking radius is present. A theoretical calculation is carried out on large-scale hydraulic pressure tunnel structure model test. The results indicate that the water pressure is balanced by the contribution provided by rock and steel reinforcement after cracks go through the lining. The difference of the stress and cracking radius under inner water pressure between single-layer reinforced concrete lining structures and double-layer reinforced concrete lining structures is small, which shows that the use of steel reinforcement mainly is to restrict the crack width in lining such that the integrity of lining can be ensured. The inner water pressure is mainly borne by rock. Therefore, in the hydraulic pressure tunnel structure, if allowable maximum crack width can be guaranteed, it is more economic to arrange single-layer reinforcement in hydraulic pressure tunnel structures.

关 键 词：有压隧洞 单双筋衬砌 围岩 结构应力 开裂半径 

分 类 号：TV311[水利工程—水工结构工程]