Geotechnical Engineering

The greater Cincinnati area is notably one of the few regions in the United States that experiences a high frequency of landslides, with hundreds of occurrences reported annually. At Ultra Technic Services, Inc. (UTS), we are a leading authority in landslide investigation and remediation, with a track record of success in more than 20 major cases throughout the region. Our expertise spans from initial investigation and analysis to the design and implementation of effective remedial measures, ensuring the stability and safety of affected sites.

Our Approach to Landslide Evaluation and Remediation:

• Geological and Geotechnical Assessments: Our investigation process begins with a thorough analysis of the geological and geotechnical conditions at each site. We evaluate soil and rock characteristics, groundwater conditions, and historical landslide data to identify potential failure mechanisms and contributing factors.
• Site Reconnaissance and Surveying: Using advanced surveying techniques, we conduct detailed site reconnaissance to map existing landslide features, such as cracks, scarps, and bulging areas. This allows us to accurately delineate the extent of the slide and determine its rate of movement.
• Subsurface Exploration: We utilize various drilling and sampling methods to obtain soil and rock samples from critical areas of the site. These samples undergo laboratory testing to determine their strength, permeability, and other key properties that influence slope stability.

• Software and Simulation Tools: Our team employs state-of-the-art software programs like Stedwin and GSTABL 7, developed in collaboration with Purdue University, to perform precise slope stability analyses. These tools allow us to model various failure scenarios and evaluate the safety factor of slopes under different loading conditions, such as seismic events, heavy rainfall, or construction activities.

• Customized Analysis for Different Structures:

• • •   Cut Slopes and Excavation Side Slopes: Analyzing the stability of slopes formed by cutting or excavation, particularly for sewer installations, roadways, and deep basement foundations
    •  Fill Embankments and Dams: Evaluating the stability of slopes formed by placing fill materials, such as embankments, levees, and dams, to ensure they meet safety standards and regulatory requirements.

• Design of Retaining Structures: We specialize in designing various retaining structures tailored to specific site conditions and failure mechanisms. For instance, at a residential site on Liberty-Keuter Road in Lebanon, Ohio, we successfully implemented a drilled pier retaining wall with tie-backs to stabilize the slope behind the property. This solution not only corrected the landslide but also provided long-term stability.

• Drainage Control Systems: Proper management of surface and subsurface water is crucial in preventing landslides. Our team designs and installs comprehensive drainage systems, including French drains, interceptor drains, and horizontal drains, to effectively control water flow and reduce pore water pressure that can destabilize slopes.

• Soil Reinforcement Techniques: We employ various soil reinforcement techniques, such as soil nailing, geogrid reinforcement, and the use of mechanically stabilized earth (MSE) walls, to enhance the shear strength of soil and improve overall slope stability.

• Vegetative Stabilization: Where appropriate, we incorporate bioengineering techniques, such as the planting of deep-rooted vegetation, to stabilize shallow soil layers and minimize surface erosion.