Role of geological structures in seepage from Lar dam reservoir

Asadollah, S. Nayeb; Aalianvari, Ali; Hajialibeigi, H

doi:10.1007/s12517-018-3967-7

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…They stated that the maximum difference between numerical results and experimental readings is within the range of 10%. Also, Nayeb Asadollah et al [16] simulated water seepage from the Lar dam reservoir using FEM and obtained a very close relation between estimated and observed discharge. A favorable agreement between experimental and numerical results implied the applicability of computer programs to find the solution of seepage problems.…”

Section: Weep Holesmentioning

confidence: 88%

Effect of weep hole and cut-off wall on hydraulic gradient and uplift pressure under a diversion dam

Mahtabi

Taran

2019

Sādhanā

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In hydraulic structures such as diversion or gravity dams constructed on a porous foundation, the difference in water levels between upstream and downstream results in water seepage through the porous soil under the dam. This seepage flow generates uplift pressure under the structure that may cause a crack on the concrete surface of the structure's floor. In this condition, the exit gradient may exceed the critical value and cause the piping phenomenon. In this study, the effect of the weep hole and cutoff wall on the uplift pressure and the hydraulic gradient under a diversion dam was investigated experimentally and numerically. For this purpose, four weep holes (diameter = 1 cm) were embedded along the longitudinal axis of the stilling basin. The weep holes were examined in single and combined modes. The experiments were conducted in three upstream water heads of 10, 15, and 20 cm. The results showed that in terms of seepage losses, hydraulic gradient, and uplift pressure, the binary combinations of weep holes are better than the other modes. Among the binary combinations, the combination of the two closest weep holes to the dam toe (weep holes 1 and 2) had the most proper performance. In the supplementary experiments, a cutoff wall in two depths (10 and 15 cm) was placed at the dam heel in addition to the best modes of weep holes combination. Overall, the simultaneous use of cutoff wall (especially 15 cm) and weep holes improved the hydraulic condition of seepage phenomenon under the dam.

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Section: Weep Holesmentioning

confidence: 88%