某沥青混凝土心墙堆石坝变形特性分析

高坝大库水电站中沥青混凝土心墙堆石坝所处地形地质环境复杂、心墙单薄、荷载大、应力水平高以及大坝渗流与变形机理复杂,因而大坝的运行安全掌控与评价难度很大。为此,结合已建的某高沥青心墙堆石坝工程,研究原型观测特性及三维应力变形规律,并将数值模拟结果与原型观测数据进行比较。结果表明,坝体最大沉降为1.56m,发生在约为坝体1/2高程处,最大沉降约为坝高的1.2%;大坝变形特性符合心墙堆石坝变形的一般规律,大坝右岸沉降变形较左岸大,整体而言,大坝变形趋于稳定,数值模拟与原型观测数据基本一致。

Deformation Characteristics Analysis of Asphalt Concrete Core-wall Rockfill Dam

Asphalt concrete core-wall dam barely occurs in large and high hydropower plants, because of its complex terrain and geological environment, thin core-wall, high load and stress levels, and its complicated mechanism of seepage and deformation. Therefore, the safe operation and evaluation of the dam is quite difficult to control. Based on a certain high asphalt core-wall rockfill dam project, this paper studied the prototype observation properties and three-dimensional stress deformation laws of the dam. The numerical simulation results were compared with the prototype observation data. The results show that the maximum settlement of the dam is 1.56 m and it is 1.2% height of the dam, which occurs in the half height of the dam body. The dam deformation is consistent with the law of core-wall rockfill dam deformation. The settlement deformation of the dam right bank is larger than that of the left bank. The deformation of the dam is stable as a whole. The numerical simulation results are basically consistent with the prototype observation data.