The dam of the Lianghekou hydropower project is a rockfill dam with a gravelly soil core wall, 295m high. In the damfi eld roller compaction test stage a detailed additional quality test method was studied. A comparison was made between the additional test method and the pit test method in terms of their test results, The comparison shows that although there is certain difference in the absolute value of the test results between the two methods, their test law and result assessment are in conformity with each other in general, which can be used as the basis for assessment of construction quality. However the additional quality test method takes less time to complete the test and has no harmful infl uence on the embankment, which is characterized by being quick, unharmful and accurate, so that it provides basis for dam placement at the later stage of construction.%两河口水电站大坝为坝高295m的掺砾土心墙堆石坝，大坝工程现场碾压试验阶段，开展了较为详尽的附加质量法研究工作，通过在不同性状土体、堆石体中的各测点与坑测法成果进行一一对比分析，得出了附加质量法与坑测法的成果差异值虽然在检测成果绝对值上存在一定差异，但总体检测规律、成果评价是一致的，能作为施工质量评价的依据。附加质量法检测施工时间短，且对填筑体不造成破坏影响，充分体现了快速、无破坏、较准确的特点，为后期大坝填筑施工提供了依据。
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