Service overview
Infrastructure, earthquake analysis, geotechnics, transportation, water resources, construction materials. This service is part of that division and is scoped individually around what you need to learn, decide or publish.
Soil and rock are materials that nature supplies rather than industry specifies. Their properties vary from point to point, depend on stress history, water content and drainage, and are measured through sampling and testing that disturb them. Geotechnical engineering has to predict the behaviour of foundations, slopes and retaining structures on this uncertain basis, and much of the discipline is about judging the reliability of inputs.
Analytical methods, such as limit equilibrium for slope stability and bearing capacity, remain valuable for their transparency. Numerical methods, particularly finite element analysis, handle complex geometry, staged construction and soil-structure interaction. In either case, the choice of constitutive model and parameters dominates the result, which is why documentation of parameter selection and sensitivity analysis is central to geotechnical research.
If you plan to publish the outcome, see manuscript & publication support, for example computational & simulation manuscripts or original research article writing.
What this service covers
Problems this service can address
- Large uncertainty in soil parameters
- Slope or foundation behaviour under changing groundwater
- Choosing constitutive models for the problem
Methods and analytical approaches
- Limit-equilibrium and finite element analysis of ground problems
- Consolidation and settlement analysis
- Constitutive-model selection and calibration
- Probabilistic treatment of parameter variability
Applications
- Foundation and slope studies
- Ground-improvement research
- Soil-structure interaction analysis
Relevant engineering disciplines
Scope, inputs and deliverables
Scope of work
- Definition of the technical question, system boundary and success criteria
- Analysis, modelling or data work appropriate to your inputs
- Results with stated assumptions and limits of validity
- Documentation in a form suitable for reports or publication
- Feasibility check on: site investigation data and soil parameters
Typical inputs required from you
- Site investigation data and soil parameters
- Geometry and loading
- Groundwater information
Deliverables
- Geotechnical analysis report
- Stability or settlement results with parameter sensitivity
- Recommendations for further testing
Highly specialised requests are first checked for feasibility from this information. Please do not send confidential data through the public form; describe it first and agree secure transfer afterwards.
Project workflow and method
- 01Enquiry and requirement assessment
- 02Technical scoping and proposal
- 03Execution
- 04Quality review and delivery, with an agreed round of revisions
Read the full project workflow.
In depth: how the work is done
Limit-equilibrium and bearing capacity analysis
Limit-equilibrium methods divide a potential slip mass into slices or wedges and compute a factor of safety from force or moment equilibrium. Methods differ in the assumptions about inter-slice forces and in their applicability to circular and non-circular surfaces. Bearing capacity and earth-pressure calculations use classical theories with empirical factors. We select methods suitable for the geometry, drainage conditions and failure mechanism and show how the factor of safety changes with assumptions.
Finite element analysis of ground problems
Numerical analysis can model construction sequence, pore-pressure development, soil-structure interaction and progressive failure. Mesh extent and boundary conditions must be large enough to avoid influence on results, and interfaces between soil and structure need appropriate modelling. Initial stress states, which depend on stress history, strongly affect predictions, and we pay attention to establishing them correctly before simulating loading.
Constitutive models and parameter calibration
The Mohr-Coulomb model is simple and widely used but represents stiffness crudely; advanced models capture nonlinearity, hardening, small-strain stiffness and cyclic behaviour but need more parameters and tests. We assist in selecting a model appropriate for the problem, deriving parameters from laboratory and in-situ tests, and recognising the limits of each model. Calibration is shown by comparing simulations with test results at the element level before applying the model to the boundary-value problem.
Consolidation and settlement
Settlement of fine-grained soils involves immediate, consolidation and secondary components. Terzaghi's one-dimensional theory gives insight into the rate of consolidation, and numerical models treat multidimensional drainage and nonlinear compressibility. Prediction of settlement is sensitive to compressibility and permeability parameters and to drainage path length, which are uncertain. We examine ranges and report settlement as a range with the factors controlling it.
Variability and probabilistic treatment
Soil parameters vary spatially and are known only from limited samples. Probabilistic analysis, using statistical distributions or random fields for parameters, quantifies the effect on factor of safety or settlement and gives probability of failure. It complements deterministic analyses and highlights which parameters most influence performance. Interpretation requires care because probability estimates depend on assumed distributions and correlation lengths.
Quality control and good practice
Quality-control approach
- Models and analyses are checked against hand calculations, published benchmarks or your data where available.
- Assumptions, boundary conditions and sources are listed in the deliverable.
- Units, symbols and terminology are checked for consistency.
- Limits of validity are stated; the work is research-level analysis, not certification.
Common pitfalls this service helps avoid
- Using a single parameter set. Soil variability means a range of parameters should be considered, with results shown as ranges.
- Ignoring drainage conditions. Short-term and long-term behaviour differ, and analysing the wrong condition can be unsafe or overly conservative.
- Poor initial stress state. Incorrect initial stresses in numerical models can distort subsequent behaviour.
- Overreliance on an advanced model with weak data. Complex models need parameters that may not be reliably determined from available tests.
What good reporting looks like
A geotechnical research report states the problem, the site or test conditions, the soil data and how parameters were derived with their variability, the analysis methods and models with justification, mesh and boundary condition details where numerical, the results with sensitivity to parameters and drainage conditions, comparison with measurements or case histories, and the limitations. It is research-level analysis and is not a site-specific design or a substitute for geotechnical investigation and design by licensed professionals.
An illustrative scenario
Hypothetical example written for explanation. It is not a client case, a result or a testimonial.
Suppose a researcher studying an embankment on soft clay wants to predict settlement and stability. A one-dimensional consolidation estimate gives a range of settlement times, and a finite element analysis with staged construction reveals the development of pore pressure under the fill. A parametric study on compressibility and permeability shows that settlement time is strongly sensitive to permeability. The report presents the range of results, compares with monitoring data from the site and advises more in-situ testing.
Questions to settle before you begin
- Is the problem drained or undrained, short-term or long-term?
- Which tests will give my parameters, and how variable are they?
- What is the initial stress state?
- Which model is justified by the available data?
- Which measurements can I use to validate the analysis?
Key terms
- Factor of safety
- The ratio of resisting to driving forces or moments for a potential failure.
- Consolidation
- The gradual dissipation of excess pore pressure and volume change of saturated soil.
- Effective stress
- The stress carried by the soil skeleton, total stress minus pore pressure.
- Constitutive model
- A mathematical description of soil stress-strain behaviour.
- Random field
- A statistical description of spatially varying properties.
Working together on Civil, Structural & Infrastructure Engineering projects
Civil, structural and infrastructure research engagements start with a description of the structure or system, the loads and environment, the codes or standards that provide context and the questions the research must answer. We ask for drawings or descriptions, material data, monitoring data where they exist and any previous analyses. The work provides research analysis, literature-based assessment and documentation. It does not replace the design responsibility of licensed engineers, code compliance checks or site-specific professional judgement, and it states clearly where those are required.
Frequently asked questions
Can you interpret my site investigation data?
We can analyse data you provide in research or study contexts. Site-specific design decisions require a qualified geotechnical engineer.
Can you analyse a slope or foundation I describe?
Yes, given geometry and soil data, within the research scope. Real projects require site-specific design by licensed professionals.
Can you help interpret laboratory test data?
Yes. We can help derive parameters and quantify their variability.
Do you do probabilistic analysis?
Yes, using methods appropriate to the available data, with assumptions clearly stated.
Do you model ground improvement?
Research-level modelling of improvement methods is possible when inputs are provided.
How is this service scoped and priced?
After your enquiry we review what you need, ask for missing information and send a written scope and quotation. Price depends on complexity, deliverables and timeline. See the project workflow.