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江谷水库坝体测压管水位从1985年10月30日起发现旧Ⅰ排2号管在相同库水位的情况下变异上升3.77m,5天后发现坝背坡反滤体排水沟湿润并有渗流,1986年8月发现旧Ⅱ排3号管和旧Ⅲ排2号管水位也变异上升了3.63m和0.95m。从上述的观测资料分析知道:土坝坝体的渗流条件有日渐恶化的趋势,尤其两岸山坡更为明显,说明坝内存在隐患。后经采用“劈裂式”的灌浆方法对全坝体灌注黄泥粘土浆,灌浆历时7个月,坝体下沉0.1～0.26m。在相同的中水位时,坝下游坡脚渗流已消失,各只变异测管水位随着坝体灌浆结束和浆液不断排水固结已有下降的趋势,预计在浆坝互压作用下,测管水位仍会下降,但有待经受汛期高水位蓄水考验。本文还对测压管水位变异的原因进行了初步分析。
The piezometer water level of the dam of Jianggu Reservoir was found to have changed by 3.77m at the same reservoir level since October 30, 1985. After 5 days, it was found that the ditches of the anticlockdown filter ditches were moist and had Seepage in August 1986 found that the old Ⅱ row No. 3 pipe and the old row Ⅲ No. 2 pipe water level also increased by 3.63m and 0.95m. From the above observations, we know that the seepage conditions of earth dam bodies are deteriorating gradually, especially the slopes on both sides of the bank are more obvious, indicating that there are hidden dangers in the dam. After the use of “split” grouting method of the entire dam body filling yellow clay slurry, grouting lasted 7 months, the dam sinking 0.1 ~ 0.26m. At the same mid-water level, the seepage at the foot of the downstream slope of the dam has disappeared. The variation of each measuring tube’s water level has been declining with the completion of the grouting and the continuous drainage and consolidation of the slurry. The water level will still drop, but it will have to withstand the high water level storage test in the flood season. This article also made a preliminary analysis of the cause of variation of piezometric water level.