地下排水与观测廊道加固方案的现场试验论证

华东天荒坪抽水蓄能电站上水库库底的地下排水与观测廊道为城门洞型,拱体为预制混凝土,边墙与底板现浇。运行期间发现廊道拱顶沿纵向开裂。电厂曾采用外加钢结构支撑混凝土拱顶的方案进行了加固处理,但裂缝开裂并没有得到有效控制。为弄清拱顶开裂原因,提出有效的改造加固方案,为此,进行了现场试验,结果表明:预制混凝土拱脚相对现浇边墙发生向外侧的滑动,是导致开裂的主要原因,因此,阻止其相对滑动,是加固处理的关键。

Argument on reinforcing scheme for underground drainage and observation gallery the upper reservoir of Tianhuanping pumping water storage power station

Underground drainage and observation gallery below the bottom of the upper reservoir of tianhuanping pumping water storage power station consists of the precast concrete arch the on-site cast concrete side wall and floor. during the operation of the power station, a longitudinal crack occurred along the roof of the arch. It was strengthening by using steel structure to sustain the roof of the arch. but the crack development was not controlled effectively. In order to recognize the reasons for cracking and present the effective strengthening scheme, we carried out the on-site experiment. the results of the experiment showed that the main reason for cracking is the relative slip on the interface between the foot of the arch and the side wall. therefore, the key to strengthening is to prevent the relative slip on the interface.