Evaluation of Seepage and Slope Stability Analysis of Embankment: A Case Study of Chel-Chel Dam, Oromia, Ethiopia.

Abstract

. This Research Was Undertaken To Evaluate Seepage And Slope Stability Analysis Of The Chel-Chel Embankment Dam Located In South-Eastern Ethiopia, With The Goal Of Identifying A List Of Useful Methods To Prevent Occurrences. The Chel-Chel Embankment Dam, Situated On A Limestone Foundation, Encounters Significant Challenges Related To Seepage And Structural Instability Due To The Solutioning Processes Inherent In Such Geological Formations. This Study Undertakes A Comprehensive Analysis Of Seepage And Slope Stability To Evaluate The Dam's Performance Under Various Conditions And Propose Remedial Measures To Enhance Its Safety And Functionality.? SEEP/W And SLOPE/W Were Conducted Using Geo-Studio 2018, By Incorporating The Dam?�?S Different Parameters.? The Analysis Assessed Seepage Rates With And Without Treatment Structures, Revealing That Untreated Seepage Ranged From 2.14 To 6.56 M??/Day Per Dam Length.? Implementation Of Foundation Treatment Reduced Seepage To 1.41?�?5.98 M??/Day And The Result Confirm That, Effective Reduction In Seepage When Further Foundation Treatment Is Applied. Slope Stability Analysis Was Also Performed Under Diverse Loading Conditions, Including Steady-State Seepage, Construction Phases, Rapid Drawdown, And Earthquake Loading.? The Morgenstern-Price Technique Was Used To Evaluate Both Force And Moment Balance. Results Indicate That The Dam Meets Or Exceeds Recommended Safety Thresholds, With Computed Factors Of Safety Of 1.71 For Steady-State Seepage, 1.68 And 1.57 For Upstream And Downstream Slopes During Construction, And 1.44 For Rapid Drawdown Conditions. Pseudostatic Earthquake Analysis, Considering A Peak Ground Acceleration Of 0.1g, Yielded A Factor Of Safety Of 1.24, Confirming The Dam's Stability Under Seismic Conditions. To Mitigate Seepage And Improve Stability, Constructing A Slurry Trench Or Concrete Cutoff In The Dam Central Foundation Section Is The Recommended Proposed Remedial Measure.