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.
出处
《水力发电》
北大核心
2013年第10期23-25,40,共4页
Water Power
关键词
高压隧洞
围岩约束
限裂计算
理论
high pressure tunnel
constraint of surrounding rockmass
cracking calculation
theory
