基于压实度保证率的砾石土压实度快速检测法优化

砾石土心墙料压实度指标是砾石土心墙大坝工程质量控制的一个关键指标，常借助核子密度仪进行快速检测。鉴于砾石土的非均质特性，常规方法利用最大干密度均值求取的压实度为近似值，当实际最大干密度大于最大干密度均值时，压实度计算值偏大，易引起误判，影响工程质量。提出了压实度保证率概念，通过压实度及压实度保证率双控指标，对常规方法进行优化，明确了优化方法的评定流程及判定准则。并结合两河口水电站工程实例，论证了常规方法仅为优化方法的一种特殊表现形式。通过两河口水电站工程2019年3月份实测数据对比分析发现：采用常规方法检测的压实度均一次检验合格，而采用优化方法检测时，存在个别不合格点，需进一步复测。优化方法较常规方法更为严格，提高了工程安全裕度，保障了工程质量。

Optimization of rapid detection method for compactness of gravel soil material based on compactness guarantee rate

Compactness of gravel core wall material is a key index for quality control of gravel core wall dam, which is usually detected by nuclear density meter. In view of the heterogeneous characteristics of the gravel soil, the compactness obtained by the mean value of maximum dry density in the conventional method is an approximate value. When the actual maximum dry density is greater than the mean value of maximum dry density, the calculated value of compactness is relatively large to cause misjudgment and affect the engineering quality. In this paper, the concept of compactness guarantee rate was put forward. Through two control indexes of compactness and compactness guarantee rate, the conventional method was optimized, and the evaluation process and criterion of optimization method were defined. Combined with the engineering example of Lianghekou Hydropower Station, it was proved that the conventional method is only a special manifestation of the optimization method. Finally, through the comparative analysis of the measured data in March 2019, it is found that the compactness degree tested by the conventional method is all qualified once, but there are some unqualified points when using the optimization method, which need further re-test. The optimization method is stricter than the conventional method, which improves the engineering safety margin and ensures the engineering quality.