Landslides are one of the most important natural hazards that occur widely in the dam’s sites as well as dam’s reservoirs. In this regard, the landslides susceptibility assessments for dam’s reservoirs can be utilized to estimate the floods risks, dam failures due to slope instabilities in reservoir. Additionally, obtain the hazard risk potential in dam’s reservoir capable to investigate the risk-able zones and categorized prone areas to land-sliding. For this purpose, the present study has tried to use a combined computational model based on fuzzy-hierarchical approach (FAHP) and geographic information system (GIS) to assessment of landslides susceptibility and hazard zonation in Shirin-darreh Dam’s Reservoir (North Khorasan) to provide the hazard risk potential maps. Methodologically, after identifying the effective factors in landslides’ occurrence (including 6 main factors as morphological, geological, climatic, seismic, in-field and susceptible and human parameters), these factors are weighted by FAHP model and layered Information has entered GIS, which has led to estimates of areas with high to low landslide risk sensitivity. Based on the results of the evaluation, it has been determined that in the peripheral margin of the southern and upstream part of Shirin-darreh dam, it has a high slip sensitivity, which can be considered as a dangerous point for dam destruction and flooding downstream of the dam. پرونده مقاله

In the design and operation of earthen dams, leakage control and permeability of the bed can be considered as one of the most important geotechnical and hydraulic issues of the dam. Studies have shown that the optimal implementation and functional control of the sealing curtain significantly plays a significant role in reducing leakage flow and also the stability of the dam. In this regard, in the present study, an attempt has been made to pay attention to this issue and to evaluate the leakage and permeability conditions to evaluate the performance of the sealing curtain for Abbasabad earthen dams based on layered bed sediments. To take. For this purpose, the finite element numerical approach and Plaxis software have been used. Methodologically, two modeling groups were implemented for the dam state without sealing the curtain and with the sealing curtain, and then the dam was dewatered and the hydraulic behavior was measured. The results of the simulation show that when the sealing curtain was not implemented, these elements had limited changes in the range of the dam core, which has become more widespread with the implementation of the sealing curtain. This issue indicates the movement and effect of the current resulting from the implementation of the sealing curtain in the area of the dam core. However, the stress drop in the dam area indicates the activity of the drains in order to relieve the pore water pressure. On the other hand, the strain expansion in the core range reflects the phenomenon of fine-grained plastic behavior resulting from in-situ stress and pore-water pressure. پرونده مقاله