碗窑碾压混凝土坝变形成因分析及监控指标的拟定

鉴于碗窑碾压混凝土重力坝个别变形测点测值异常现象,依据大坝变形观测资料,通过变形规律时空分析和统计模型的建立,以及影响因子的分解,合理地解释了其变形成因,从而得出碗窑水库大坝变形性态总体正常的结论。为确保大坝安全运行,通过建立有限元力学模型和混合模型,拟定了典型坝段坝顶水平位移的一级监控指标,进而更有效地监控大坝的安全性态。另外,就个别测点坝段时效有呈逐年缓慢上升的趋势,建议管理单位加强观测,并及时分析,确保工程安全运行。

Cause Analysis of Deformation and Determination of Monitoring Index for Wanyao RCC Dam

Aiming at the abnormal phenomena of measured value of individual deformation measure points in Wangyao RCC(roller compacted concrete) gravity dam, the cause to it was rationally explained on the basis of deformation data by using space-time analysis of deformation rule, building statistical model and decomposing the factors affecting deformation. And then the conclusion was drawn that the deformation behavior was normal as a whole for the dam. To ensure the dam safety, the first-level monitoring indexes to measure the horizontal displacement of typical dam top were decided by use of the finite element mechanical model and mixed model. Thus, the safety behavior of dam can be monitored effectively. Additionally, for some position where the deformation was slowly rising with the aging of the concrete, it is suggested that the relevant observation should be strengthened and the analysis on the data should be made in time so as to ensure the safety of the dam.