温度变化对小浪底水库排沙洞无粘结预应力衬砌结构应力状态的影响

小浪底排沙洞是我国第一个采用无粘结预应力混凝土衬砌结构的高压水工隧洞,结合工程运行过程中的观测数据,对温度作用下混凝土应变计的应变变化规律和基于应变监测数据的温度应力计算方法进行了探讨,分析了温度变化对预应力衬砌结构应力状态的影响。结果表明,温度变化对衬砌结构的应力状态会产生比较大的影响,当温度升高时,衬砌中的温度压应力也随之增大;且温度相同时衬砌内侧受到的影响更大。

Stress State of Non-cohesive Prestressed Lining Structure of Xiaolangdi Reservoir Flush Tunnel under Temperature Change

Xiaolangdi reservoir flush tunnel is the first high pressure hydraulic lining tunnel that uses the structure of non-cohesive prestressed concrete in China. For studying the stress state of the structure under the temperature change, combined with the observation data during the operation of the project, the change rule of the reading strain and the computing method of temperature stress based on monitoring data under the temperature change are discussed. The stress state of prestressed lining structure under the temperature change are also analyzed. The results indicate that temperature change have a relatively large impact on the stress state of prestressed lining structure; when the value of temperature change increases, the tensile stress of the lining will increase; the temperature has a greater impact on inner lining.