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桃曲坡水库库区属灰岩地区,水库于1974年建成后,于1974、1975、1976年出现了三次大的漏水现象,日漏量最大达到240万m~3。水库漏水的主要原因是灰岩发育有溶洞;灰岩上覆盖的砂页岩被裂隙、断层、塌滑、废煤井破坏,形成漏水通道。对水库漏水的治理措施有:采用混凝土“填塞”和“封堵”溶洞、裂隙、塌坑及废煤井,并对原河床卵石覆盖透水层及岸边漏水点采用“铺包”法等。治理效果良好,10年间灌区增产总值达17,845万元,相当于工程投资(包括全部补漏投资)的4.8倍。
The Taquipo Reservoir is a limestone area. After the reservoir was completed in 1974, three large water leakage occurred in 1974, 1975 and 1976, with the maximum daily leakage reaching 2.4 million m3. The main reason for reservoir water leakage is the development of karsts in limestone. The sand shale covered by limestone is damaged by cracks, faults, landslides and waste coal wells to form water leakage channels. Leakage control measures for the reservoir include: “plugging” and “sealing” caves, fissures, collapses and waste coal wells with concrete; and adopting the “paving” method for the original bed pebbles covering the water-permeable layer and the shore leakage point. The treatment effect is good. The total output of irrigated area has reached 178.45 million yuan in 10 years, which is equivalent to 4.8 times of the investment in construction (including all the investment in backwash).