考虑围岩约束高压隧洞衬砌结构限裂计算理论探讨  

Discussion on Calculation Theory of Pressure Tunnel Lining Cracking by Considering the Constraint of Surrounding Rockmass

作　　者：张巍[1] 黄立财[1] 刘林军[1] 

机构地区：[1]广东省水利电力勘测设计研究院,广州广东510635

出　　处：《水力发电》2013年第10期23-25,40,共4页Water Power

摘　　要：对于高压隧洞而言,钢筋的主要作用不在于受力,而在于限制裂缝展开宽度,以减少衬砌的渗漏量,提高耐久性。从考虑围岩约束的角度,假定钢筋混凝土衬砌的最大变形不超过不衬砌隧洞围岩的变形,并考虑衬砌开裂后高压水内水外渗在裂缝面上产生劈缝力的影响,推导出相应的高压隧洞限裂计算公式。算例分析表明,计算出的钢筋面积较规范公式小,更加符合工程实际。The main function of reinforcing bar in high pressure tunnel lining is not for bearing forces, but in limiting the width of crack to reduce water leakage and improve lining durability. A cracking calculation formula of high pressure tunnel lining is deduced by considering the constraints of surrounding rockmass and the cracking forces created by water leakage through lining cracks, and assuming the maximum deformation of reinforced concrete lining does not exceed the deformation of surrounding rock when without lining. The case study shows that the calculated area of reinforcement bar is smaller than the result of Specifications, which is more corresponding to engineering practice.

关 键 词：高压隧洞 围岩约束 限裂计算 理论 

分 类 号：TV314[水利工程—水工结构工程]