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Evaluation of the effectiveness and reliability of drains of the tailrace of the Plyavinyas hydroelectric station
Conclusions 1. The drains of the right wall of the tailrace provide a decrease of heads of the seepage flow in the train to values safe with respect to conditions of the stability of the loamy sand moraine in the region of the apron and bucket against upward yielding, though the effectiveness of the majority of the wells in the system is considerably lower than envisaged by the design. 2. The drain wells in the tunnel do not have an effective influence on lowering the hydrostatic levels in the train and region of the bucket and apron owing to the seepage inhomogeneity of the bed. 3. The transmissivity of the bed and maximum permissible elevation of the hydrostatic level at the top of the train with respect to the conditions of the absence of upward yielding of the loamy sand moraine, which were determined as a result of on-site investigations and calculations, differ considerably from the design values. 4. On-site observations did not confirm the design assumption about the possibility of an increase of the hydrostatic levels in the Amata horizon in the region of the hydrostation after filling the reservoir to levels exceeding the normal pool level. 5. Variant 1 can be considered a rational variant of the scheme of drains with sufficient reliability. In this case, if necessary, the number of wells in the RL can be reduced to 10 (variant 2) without the danger of upward yielding of the moraine in the region of the flexible apron and bucket, whch makes it possible to close or eliminate wells that are broken down. 6. The actual system of discharge of seepage flow in the train and Amata-Gauja horizon has approximately a threefold reserve. 7. The construction of wells and drain pipes of iron substantially reduces the reliability of operation of the drains and creates emergency situations.
Evaluation of the effectiveness and reliability of drains of the tailrace of the Plyavinyas hydroelectric station
Conclusions 1. The drains of the right wall of the tailrace provide a decrease of heads of the seepage flow in the train to values safe with respect to conditions of the stability of the loamy sand moraine in the region of the apron and bucket against upward yielding, though the effectiveness of the majority of the wells in the system is considerably lower than envisaged by the design. 2. The drain wells in the tunnel do not have an effective influence on lowering the hydrostatic levels in the train and region of the bucket and apron owing to the seepage inhomogeneity of the bed. 3. The transmissivity of the bed and maximum permissible elevation of the hydrostatic level at the top of the train with respect to the conditions of the absence of upward yielding of the loamy sand moraine, which were determined as a result of on-site investigations and calculations, differ considerably from the design values. 4. On-site observations did not confirm the design assumption about the possibility of an increase of the hydrostatic levels in the Amata horizon in the region of the hydrostation after filling the reservoir to levels exceeding the normal pool level. 5. Variant 1 can be considered a rational variant of the scheme of drains with sufficient reliability. In this case, if necessary, the number of wells in the RL can be reduced to 10 (variant 2) without the danger of upward yielding of the moraine in the region of the flexible apron and bucket, whch makes it possible to close or eliminate wells that are broken down. 6. The actual system of discharge of seepage flow in the train and Amata-Gauja horizon has approximately a threefold reserve. 7. The construction of wells and drain pipes of iron substantially reduces the reliability of operation of the drains and creates emergency situations.
Evaluation of the effectiveness and reliability of drains of the tailrace of the Plyavinyas hydroelectric station
Rogal', M. F. (author)
Hydrotechnical Construction ; 14 ; 50-58
1980-01-01
9 pages
Article (Journal)
Electronic Resource
English
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