氧化镁混凝土拱坝的宏观变形

在整理三江拱坝等氧化镁混凝土拱坝工程长达十年之原型监测资料的基础上,结合拱坝在库水、空气、地基等边界条件下的实测温度,讨论拱坝的温度场及温度作用。同时,三江拱坝的正倒垂观测资料表明,全坝混凝土外掺氧化镁后使拱坝产生了类似于温升作用的变形效果,在宏观变形上进一步验证氧化镁混凝土的膨胀效应,并从拱坝宏观变形的角度讨论了混凝土外掺氧化镁后的工程意义。

Macroscopic deformation of MgO concrete arch dams

Based on 10 years of prototype monitoring data of existing MgO concrete arch dams in China, such as the Sanjiang Arch Dam, and in combination with measured temperatures under the boundary conditions in regard to reservoir water, air, and foundation, the temperature field and temperature load of arch dams are discussed. Observed data from the Sanjiang Arch Dam using the plumb line and inverted plumb line method indicate that the deformation of the arch dam induced by adding MgO to concrete for dam construction is similar to that caused by temperature rise, verifying the expansion effect of MgO concrete. From the viewpoint of the macroscopic deformation of the arch dam, the engineering significance of MgO concrete is further discussed.