面板堆石坝的填筑碾压质量直接关系到该水库建成后的安全运行,但传统的以随机取样的干密度实验检测坝体填筑质量的方法,其不能全面反映坝体实际的碾压质量,影响坝体质量评价的可靠性。本文依托面板堆石坝“碾压施工质量实时监控系统”,并基于面板堆石坝填筑质量变异性分析,将工程实际的干密度指标和可靠度理论相结合,建立了坝体干密度一可靠度二元耦合评价模型,提出了评价面板堆石坝碾压质量的具体流程;以河南省某在建水库工程为例,通过料源含水率和粒径参数的可靠性和敏感性分析,研究了干密度的变异性和干密度影响因子对干密度的影响程度,应用耦合干密度及可靠度的碾压质量二元评价给出了完整碾压区域的干密度分布及其满足施工要求的可靠度,提高了评价有效性和可靠性,对面板堆石坝填筑的质量控制提供有用的科学依据。
Traditional method uses randomly-sampled dry density to evaluate dam rolling compaction quality, but it cannot reflect the real quality of rolling compaction. To improve the evaluation, a dual evaluation model combining the dry density method with a reliability theory for dry density parameter analysis on the platform of a construction quality real-time monitoring system is developed, and a corresponding implementation procedure is established for the evaluation. In application of this dual method to one reservoir construction project in Henan province, variability of dry density and its influencing factors were obtained via reliability and sensitivity analysis on its parameters. It has been shown that the dual evaluation based on real-time monitoring improves the reliability of evaluation and provides a technical support to dam rolling compaction quality control.