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After 18 years operation ofthe Panjiakou Reservoir, the first safety check and identification on dam w as conducted in 1998.A review on engineering geologicalissueisperform ed based on thepreviousinvestigation resultsand observed dataduring reservoir operation.The m ain engineering geologicalissueincludes reservoir-induced earthquake, excavation offoundation pit, shearstrength ofinterfacebetw een concretedam and bedrock,curtain grout,stability ofslope,alkali-silica reactivity ofconcrete aggregate, etc. 潘家口水库运行18 年后,于1998 年对水库大坝进行了首次安全鉴定。根据运行期观测资料,结合以往勘察成果, 对水库诱发地震、基坑开挖、混凝土坝体与建基岩体接触面抗剪强度、帷幕灌浆、边坡稳定、混凝土骨料碱活性等主要工程地质问题进行再认识。 The alkaline activity test on the concrete aggregate for Three Gorges Project is a re check test on the basis of the great number of long term research results. The chemical method, mortar bar length method and autoclave test are adopted in the study, in order to fully discover the activity of natural and artificial aggregates for the Three Gorges Project. On the basis of the analysis on the test results, some scientific suggestions have been put forward for the selection of concrete aggregate for the second... The alkaline activity test on the concrete aggregate for Three Gorges Project is a re check test on the basis of the great number of long term research results. The chemical method, mortar bar length method and autoclave test are adopted in the study, in order to fully discover the activity of natural and artificial aggregates for the Three Gorges Project. On the basis of the analysis on the test results, some scientific suggestions have been put forward for the selection of concrete aggregate for the second stage of the Three Gorges Project. 三峡工程混凝土骨料碱活性检验项目是在以往大量长期的研究工作的基础上进行的复核检验。研究采用了化学法、38℃和 5 0℃养护砂浆棒长度法、水泥碱含量高达 1.5 %条件下 5 0℃养护砂浆棒长度法、压蒸法等方法进行检测 ,以便充分揭示三峡工程天然骨料和人工骨料是否存在活性。通过对检测结果的分析 ,对三峡二期工程混凝土骨料的选用提出了科学的建议。
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