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Services
Site Investigations
Geotechnical Investigations: Building Strong Foundations
Sydney's diverse geology demands precise geotechnical investigations for all residential and commercial foundations. We uncover the unique characteristics of your site's subsurface soils and geology, providing crucial data for robust and cost-effective designs. Our expert assessments mitigate construction risks, optimize foundation solutions, and ensure compliance with NSW regulations and Australian Standards.
From classifying reactive clays in Western Sydney to designing deep foundations in estuarine deposits, our team leverages sound soil and rock mechanics principles and extensive local knowledge. We offer comprehensive services including subsurface exploration, laboratory testing, and detailed recommendations for footing design, excavation support, and ground improvement. Trust Geotechnical designs for site-specific solutions that prevent costly over-engineering and ensure the long-term stability of your project.
Contact Geotechnical Designs today to arrange a site inspection and report tailored to your lot.
On-site Geotechnical Verification and Inspections for Bored Piles/Foundation
During pile construction, actual subsurface conditions can differ from the pre-construction geological model. To manage this risk, a geotechnical engineer is present on-site to verify ground conditions in real time and confirm they align with design assumptions. The engineer focuses on:
- Pile socket material and length compliance with the design
- Pile base and shaft cleanliness to ensure proper end bearing and skin friction
An on-site geotechnical report is prepared and issued immediately after inspection. If conditions vary from the original assumptions, the engineer provides immediate advice and coordinates with the designer to develop practical solutions that keep works progressing safely and efficiently.
Our Inspection Services
- Bored Pile Construction Verification
- Confirm pile socket material (e.g., weathered/competent rock) and achieved socket length
- Check pile diameter and verticality tolerance
- Assess base and shaft cleanliness (e.g., visual, spoil logging, base inspection tools, cleanliness criteria)
- Trench Stability Inspections
- Assess temporary excavation/trench stability and groundwater impacts
- Verify support systems (e.g., shoring, shotcrete, bracing) and safe batter angles
- Bearing Capacity Assessments
- Evaluate founding stratum quality at pile base or shallow footings
- Advise on design bearing pressures, load transfer, and any required remediation
- Foundation Inspections
- Verify founding levels, and proof-rolling outcomes
- Check compliance with geotechnical specification and tolerances
- Document conditions prior to blinding or concrete placement
- Pile / Crane Assessment
- Assess pile capacities and layout for crane loads and construction staging
- Check working platform bearing and stability for crane operations
- Provide recommendations on temporary works, load spread, and exclusion zones
- Ground Condition Verification and Reporting
- On-site logging of soil/rock strata and groundwater conditions
- Immediate geotechnical reports issued with clear pass/fail criteria
- Variations escalated promptly with practical, constructible solutions coordinated with the designer
Contact Geotechnical Designs today to arrange a site inspection and report tailored to your lot.
Deep Excavation
Shoring design for deep excavation in building basements requires a thorough geotechnical interpretation report to determine the appropriate type of piles based on the geology of the site. Important options include sheet piles, contiguous piles, and soldier piles, all of which should be assessed alongside a slope stability analysis and soil and rock profiling to ensure structural integrity.
Geotechnical Interpretation Report
We provide comprehensive Geotechnical Interpretation Reports (GIR) that deliver a detailed analysis of subsurface conditions, ensuring safe and efficient design solutions for construction, infrastructure, and tunnelling projects. We support developers and consultants by offering:
Site Investigation Data Analysis – Interpretation of borehole logs, geophysical surveys, in-situ and laboratory test results.
Soil & Rock Characterization – Classification of ground materials, strength properties, and geotechnical parameters for design considerations, incorporating soil and rock profiling techniques.
Tunnelling & Rock Mechanics Assessment – Analysis of rock mass quality, stress conditions, and potential hazards to optimize tunnel design and support systems.
Geotechnical Risk Evaluation – Identification of geohazards such as landslides, subsidence, fault zones, and groundwater challenges.
Foundation & Excavation Recommendations – Providing expert advice on deep/shallow foundations, retaining structures, cuttings, and embankments.
Our expertise ensures a comprehensive understanding of ground behaviour, reducing risks and optimizing design solutions for safe and sustainable development.
Soil and Rock Profiling for Foundations
We are specialized in creating detailed soil and rock profiles for dam foundations by utilizing borehole data and geophysical surveys. Our soil and rock profiling process offers a comprehensive understanding of subsurface conditions, ensuring the stability, safety, and longevity of dam structures.
Our Approach:
Borehole Data Interpretation – Analyzing core samples, Standard Penetration Test (SPT) results, and laboratory tests to compile a geotechnical interpretation report that determines soil and rock properties.
Geophysical Surveys – Employing methods such as seismic refraction, electrical resistivity, and ground-penetrating radar (GPR) to map subsurface variations.
Soil & Rock Stratification – Identifying different layers, strength parameters, permeability, and deformation characteristics.
Foundation Suitability Assessment – Evaluating bearing capacity, settlement potential, and potential risks such as seepage or liquefaction.
Geotechnical Risk Identification – Detecting weak zones, fault lines, karst formations, or any geohazards affecting the dam's foundation stability.
Our soil and rock profiling services empower engineers and developers to make informed decisions, mitigate geological risks, and optimize dam foundation design for long-term performance.
Slope Stability
We provide slope stability analysis through both limit equilibrium and FEM, ensuring a comprehensive geotechnical interpretation report. In addition to designing excavated slopes, we conducts stress analysis, checks their stability, and performs groundwater analysis. We also offers excavation support system designs for both soil and rock profiling. Our designs include seismic analysis for slopes, as well as for embankments and dam abutments, accounting for fluctuations in water levels.
Underground Excavation
By using FEM software, we designs complex, multi-stage models and interprets results for every stage of excavation, contributing to a comprehensive geotechnical interpretation report. We design tunnels and shafts in weak and jointed rock, underground powerhouse caverns, and tunnel portals. We adopts all rock mass classifications for determining support measures empirically and numerically for all tunnel classes. Numerically, we employs the convergence-confinement method for anticipating deformation in rock mass and support design.
Tunnel Lining Design
Tunnel Lining is specifically designed for hydropower and transportation tunnels, taking into account the results from a geotechnical interpretation report. It is engineered to withstand both internal and external water pressures, as well as additional factors such as wedges and other existing pressures, all of which are crucial for conducting a slope stability analysis and for accurate soil and rock profiling.
Seepage and Groundwater Modelling
She performs a geotechnical interpretation report to assess potential groundwater inflows during construction, along with a slope stability analysis to evaluate potential water level changes and settlement due to drawdown beneath surrounding properties, including soil and rock profiling.