龙凤山水库是一座以防洪、灌溉为主，兼顾发电、养鱼的大型水库，曾被水利部列为全国43座病险水库之一．1987～1993年，历时6年对该库进行消险加固，其中土坝坝基与东山岸坡基岩衔接处的渗漏问题是消险加固设计的关键．经过方案比较，采取冰上倒冻土加长、加厚坝前铺盖，配合高压定喷法构筑混凝土防渗墙等措施，较好地解决了基础渗漏问题，使水库效益得到正常发挥． Longfengshan Reservoir is a flood control, irrigation, taking into account the power generation, fish breeding large reservoirs, was the Ministry of Water Resources as one of the 43 dangerous reservoirs. From 1987 to 1993, the reservoir was eliminated and strengthened after 6 years. The leakage of the joint between earth dam foundation and Dongshan bank slope is the key to the design of hazard elimination and reinforcement. After comparison of the schemes, measures such as lengthening the soil on the ice, lengthening the cover before thickening the dam, and constructing the concrete cutoff wall with the high pressure setting and spraying are adopted to solve the problem of foundation leakage and make the benefit of the reservoir be brought into full play.