Abstract: After the reinforcement of Longshan reservoir, there is a problem of settlement, which leads to cracks on the dam crest and has unknown impact on the dam operation safety. This study comprehensively uses pit exploration, drilling and geophysical exploration methods to evaluate the dam operation safety, analyze the current situation of dam filling, investigate and analyze the causes of cracks and settlement problems. Meanwhile, the impact of the infiltration line lowering caused by reinforcement is considered to conduct a preliminary evaluation of settlement. The results indicate that the settlement of Longshan reservoir is mainly due to the low filling quality in some areas of dam body and the infiltration line lowering, which leads to the consolidation settlement of filling material. Although the settlement situation still meets requirements, the risk of continued settlement cannot be ruled out. It is necessary to excavate the non- dense soil and rerun the thickening and reinforcement project. The relevant survey methods and analysis can provide reference for similar dam settlement problems.

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摘要： 龙山水库经除险加固工程后存在沉降问题，导致坝顶出现裂缝，对大坝运行安全影响未知。综合采用坑 探、钻探和物探手段对大坝运行安全进行评价，分析坝体填筑现状，对裂缝和沉降问题成因进行调查分析，同时考 虑加固工程引起浸润线降低的影响，对沉降量进行初步评价。结果表明，龙山水库沉降主要由于坝体部分区域填 筑质量较差，以及浸润线降低引起填料固结沉降。虽然沉降现状仍满足要求，但不排除继续沉降的风险，需挖除 不密实土体后重新进行培厚加固。本研究相关勘测手段及分析可为类似坝体沉降问题提供参考。

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