Previous Projects

Geotechnical Investigation and Slope Stability Analysis

Jimma-Chida Road Project

• Desk Study and Preliminary Assessment
  • Collected and reviewed all available geological, topographical, and geotechnical data relevant to the road corridor.
  • Interpreted aerial photographs, satellite imagery, and existing maps to identify geomorphological features and potential slope instability zones.
  • Conducted a site walkover survey to observe surface conditions, drainage patterns, vegetation cover, signs of distress, and historical slope failures.
• Detailed Geotechnical Investigation
  • Borehole Drilling and Test Pits: Subsurface conditions were investigated through strategically located boreholes and test pits to identify soil and rock stratigraphy, groundwater conditions, and the depth of weathering.
  • Sampling and Laboratory Testing: Representative soil and rock samples were collected and tested to determine key engineering properties such as shear strength, unit weight, cohesion, angle of internal friction, Atterberg limits, and permeability.
  • In-Situ Testing: Performed field tests such as Standard Penetration Test (SPT), Cone Penetration Test (CPT) to evaluate in-place strength parameters and consistency of soils.
• Slope Geometry and Material Characterization
  • Surveyed slope geometry using total station and drone-based photogrammetry to generate accurate slope profiles and cross-sections.
  • Characterized materials along the slope—differentiating between colluvium, residual soils, weathered rock, and intact rock—to define engineering zones and interfaces.
• Groundwater and Drainage Assessment
  • Identified seepage zones and shallow groundwater conditions that could affect slope behavior.
  • Assessed the adequacy of existing drainage systems and potential impacts of water infiltration on slope stability.
• Slope Stability Analysis
  • Developed geotechnical models for representative slope sections using appropriate analytical and numerical methods.
  • Conducted both limit equilibrium analysis (Morgenstern-Price methods) and numerical modeling (FEM ) where complex ground conditions required more detailed simulation.
  • Evaluated Factor of Safety (FoS) for various slope configurations under static and seismic loading conditions.
  • Assessed the impact of road cuts, embankments, and potential loadings on slope performance.
• Stabilization and Design Recommendations
  • Identified sections requiring stabilization
  • Proposed suitable mitigation measures, such as:
    • Regrading or flattening slopes
    • Installation of retaining structures (gabion walls, reinforced earth)
    • Drainage improvement (surface drains, sub-horizontal drains)
    • Reinforcement techniques (soil nails)
  • Provided design parameters and construction guidelines for slope protection works.
• Reporting and Documentation
  • Prepared a detailed geotechnical investigation report, including test results, slope stability analyses, and engineering recommendations.
  • Included maps, cross-sections, and stability charts to support design decisions and inform construction planning.

Geomechanical & Geotechnical Studies – Discontinuity Mapping, Settlement Identification, and Remedial Measures

Gondar Fasiledas Conservation Project

• Discontinuity Mapping and Analysis
  • Field Survey and Geological Mapping: conducted detailed structural mapping of exposed rock faces, surfaces, and buildings within the conservation area to identify and record all relevant discontinuities, including joints, bedding planes, foliations, and fractures.
  • Measurement and Characterization: Key parameters such as orientation (dip and dip direction), spacing, persistence, roughness, aperture, infilling material, and weathering conditions were measured and documented.
  • Kinematic Analysis: using stereographic projection techniques, performed kinematic assessments to evaluate potential failure mechanisms (e.g., planar, wedge, toppling) in relation to slope geometry and discontinuity orientations.
• Settlement Identification and Assessment
  • Visual Inspection and Monitoring: identified surface signs of settlement including cracks in masonry, tilting structures, ground depressions, and displacement of blocks or stone elements.
  • Subsurface Investigation: used data from geophysical investigations
  • Historical Comparison: compared current deformation patterns with archival data, historical images, or previous survey records to understand the progression of settlement phenomena over time.
• Remedial Measures Recommendations. Based on the findings of the geomechanical/geotechnical assessment, site-specific stabilization and conservation recommendations were developed, including:
  • Structural Stabilization
    • Installation of rock bolts or anchors to reinforce unstable rock blocks or fractured masses.
    • Use of tie rods, buttresses, or stainless-steel anchors in heritage masonry to counteract displacement or separation.
  • Surface Protection
    • Application of compatible grouting to fill open joints and stabilize fragmented sections without compromising heritage value.
    • Use of protective mesh or netting in rockfall-prone zones.
  • Ground Improvement
    • Compaction grouting or underpinning of foundations where differential settlement was observed.
    • Installation of micro-piles or soil nails to enhance bearing capacity and control settlement in weak or loose ground.
  • Drainage and Water Control
    • Improvement of surface and subsurface drainage to reduce water ingress that could trigger instability or accelerate settlement.
    • Diversion of runoff from sensitive areas through gutters or perimeter drains.
  • Monitoring and Maintenance Plan
    • Development of a long-term monitoring and maintenance plan including periodic inspections, instrumentation checks, and condition assessments to track the performance of remedial measures and respond to new risks.

Geotechnical Study – Alternative Transportation Solutions (Underground Crossings and Underground Terminals)

Piassa-Megenagna-Bole-Arat Kilo Corridor Development Project

• Preliminary Site Assessment and Data Collection
  • Conducted a comprehensive desk study compiling existing geological maps, utility records, topographic data, and prior investigations within the corridor.
  • Identified feasible zones for underground solutions through alignment studies, taking into account land use, environmental constraints, urban density, and projected transportation demand.
• Geological and Geotechnical Investigation
• Feasibility Analysis for Underground Transportation Structures
  • Assessed the geotechnical feasibility of proposed underground solutions
• Geotechnical Risk Identification and Mitigation Planning
  • Identified geohazards such as soft ground, fault zones, high water table, swelling/shrinkage soils, and ground contamination.
• Development of Alternative Engineering Solutions. Based on the geotechnical findings, multiple underground infrastructure alternatives were proposed
  • Shallow vs. Deep Underground Terminals
  • Cut-and-Cover vs. Bored Crossings
  • Provided geotechnically informed decision support tools to stakeholders to optimize route alignment and infrastructure type.
• Reporting and Integration into Corridor Development Master Plan
  • Produced a detailed geotechnical report summarizing all investigation findings, engineering analyses, and design recommendations.
  • Ensured that the proposed underground solutions were fully integrated into the broader transportation and urban development strategy of the Piassa-Megenagna-Bole-Arat Killo Corridor.

Geotechnical Investigation – Geological and Structural Mapping, Strata Modeling, Fault Zone Identification, and Remedial Measures Recommendations

Ayat Kazanchis Private Public Partnership Project

• Geological and Structural Mapping
  • Conducted detailed surface geological mapping across the project footprint to identify and record the distribution of rock types, weathering patterns, and structural features.
  • Structural Mapping involved systematic identification and measurement of discontinuities such as joints, bedding planes, faults, folds, shear zones, and fracture systems.
  • Mapped features were digitized and integrated into a GIS environment for spatial correlation with project components (e.g., alignment, structures, utilities).
• Subsurface Stratigraphic Modeling (Strata Modeling)
  • Developed a 3D geological model of the subsurface using borehole logs, geophysical survey data, and outcrop information to represent the vertical and lateral variation of soil and rock layers.
  • Stratigraphic units were interpreted and correlated across the site, allowing for the accurate delineation of:
    • Lithological boundaries
    • Interfaces between soil and bedrock
    • Depth of competent strata suitable for foundations
  • The model served as a critical input for design planning, construction method selection, and geohazard risk evaluation.
• Fault Zone Identification and Characterization
  • Mapped fault zones within the project area through integration of field data, desktop study, and regional tectonic studies.
  • Assessed fault characteristics including:
    • Width and orientation of fault zones
    • Nature of fault gouge and damage zone materials
    • Evidence of recent activity (e.g., surface rupture, offset features)
  • Evaluated the seismic and geotechnical implications of fault proximity, including potential for ground rupture, differential settlement, and shear displacement.
• Remedial Measures Recommendations. Based on the identified geological and structural risks, remedial and mitigation measures were recommended to ensure safe, cost-effective, and resilient project development:
• For Fault-Affected Areas:
  • Realignment of structures and infrastructure to avoid surface fault rupture zones where feasible.
  • Design of flexible foundation systems or seismic joints for structures intersecting fault zones.
  • Reinforcement of subgrade materials using deep foundation systems, ground improvement, or geosynthetics in shear-prone areas.
• For Unfavorable Strata and Weak Zones:
  • Ground improvement techniques such as grouting, jet grouting, or deep soil mixing.
  • Excavation stabilization through temporary supports and staged construction.
• Reporting and Integration with Engineering Design
  • A comprehensive geotechnical report was prepared summarizing:
    • Geological and structural maps
    • Borehole and lab test data
    • 2D/3D strata models
    • Fault hazard zones and risk ratings
    • Engineering recommendations and mitigation strategies
  • The geotechnical findings were integrated with design teams and stakeholders to inform safe foundation design, and construction planning under the Private Public Partnership (PPP) framework.

More Accomplishments

Geomechanical Study – Anchor Spot Selection Based on Geomechanical Analysis