How to calculate large amounts of calculations with AllWave-PDP?

AllWave-PDP can handle large numbers of calculations by running systematic parameter sweeps across multiple penetration depths, hammer configurations, and soil scenarios in a single study. A complete drivability study for a single pile location can easily require hundreds of individual wave equation runs, and projects with multiple pile types or locations multiply that number further. The sections below explain what drives that calculation volume and how to manage it effectively.

What types of calculations does AllWave-PDP perform?

AllWave-PDP performs one-dimensional stress wave calculations that simulate the coupled interaction between hammer, pile, and soil resistance during every individual blow. For each penetration level, the software computes blow count, compression and tension stresses along the full pile length, energy transfer, pile motion, and soil resistance as a function of depth. These outputs together answer whether a pile can reach its target penetration safely and within practical limits.

The foundation of every AllWave-PDP run is the Method of Characteristics (MoC), a wave equation approach with roots in Dutch geotechnical research going back to the 1950s and 1970s. Unlike simplified rigid-body models, MoC treats the pile as a flexible medium through which stress waves travel. Forces, velocities, displacements, and soil interaction effects are all calculated as functions of both time and depth, which makes the results far more detailed than a single bearing capacity number.

A single calculation run addresses several questions simultaneously:

Drivability: does the blow count stay within a workable range at every depth?
Pile integrity: do compression and tension stresses remain within structural limits?
Hammer operation: does the hammer stay within its rated operational boundaries?
Fatigue: what stress cycles accumulate over the full installation sequence?
Installation time: how many blows and how much time does reaching target penetration require?
Refusal risk: at what depth might further penetration become practically impossible?

AllWave-PDP also supports input from CPT, SPT, and laboratory data, and its built-in hammer library covers a wide range of impact hammers. The AllWave software package extends this capability to vibratory driving through AllWave-VDP, which uses the same MoC framework but applies a fundamentally different load mechanism and soil reaction model.

Why do drivability studies require large numbers of calculations?

Drivability studies require large numbers of calculations because a reliable prediction is not a single run but a structured exploration of uncertainty. Soil conditions vary with depth, hammer parameters are never perfectly known in advance, and pile geometry may change between design iterations. Each combination of these variables requires its own wave equation calculation, and a thorough study must cover all combinations that could realistically occur on site.

Several factors drive the calculation volume upward:

Penetration depth increments. AllWave-PDP evaluates the pile at successive penetration steps from initial contact to final depth. Each step represents a separate calculation because the active pile length, the soil resistance profile, and the stress wave behaviour all change as the pile advances. A pile driven to 40 metres with 0.5-metre steps already requires 80 base calculations before any parameter variation is added.

Sensitivity analyses. Soil resistance to driving (SRD) is inherently uncertain. Friction fatigue, setup effects, and variability in CPT-based soil modelling all introduce ranges rather than single values. A responsible drivability prediction tests upper-bound, lower-bound, and best-estimate SRD scenarios at every depth, immediately tripling the run count.

Hammer and equipment variations. Projects often evaluate multiple hammer options, different stroke heights, or alternative cushion configurations. Each combination must be assessed across the full penetration range to identify which setup delivers acceptable blow counts without exceeding structural stress limits.

Multiple pile types or locations. Offshore wind foundations, for example, may involve dozens of monopiles or jacket piles across a field, each with slightly different soil profiles derived from individual CPT logs. Soil modelling for pile driving at each location produces its own parameter set, and each set requires its own full calculation sequence.

The result is that a single-location study with three SRD scenarios, two hammer options, and 80 depth steps already involves close to 500 individual runs. Multi-location projects scale this into the thousands.

How does AllWave-PDP handle batch or automated calculation runs?

AllWave-PDP manages large calculation volumes through structured batch processing, where the software executes a predefined matrix of parameter combinations automatically without requiring manual input between runs. The user defines the penetration steps, the soil model variants, and the hammer configurations in advance, and AllWave-PDP works through the full matrix systematically, storing results for each run.

This approach reflects the broader workflow that a reliable drivability prediction demands. The practical sequence runs as follows: define installation criteria, model the pile geometry and material properties, model the driving system including ram, energy, helmet, and cushion, build the soil model from CPT or SPT data, set penetration increments, and then let the software simulate stress waves across all combinations. Impedance changes along the pile length receive particular attention because they generate local reflections that alter the stress distribution and must be captured correctly at every depth step.

Sensitivity runs are built into this workflow rather than added as an afterthought. Once the base model is established, upper and lower bound soil resistance scenarios can be run as additional passes through the same depth sequence. The outputs from all runs feed into a single results framework, making it straightforward to compare blow count curves, stress envelopes, and energy transfer values across scenarios side by side.

For vibratory driving, AllWave-VDP follows the same batch logic but applies it to a different excitation mechanism. The two programs share the MoC foundation, which means teams working across both impact and vibratory driving prediction can apply consistent modelling principles while accounting for the fundamentally different soil reaction behaviour each method produces.

What are the practical limits of AllWave-PDP’s calculation capacity?

AllWave-PDP’s practical limits are defined less by raw computational capacity and more by the quality of the input data and the engineering judgment applied to interpret results. The software can process extensive calculation matrices, but the reliability of those results depends directly on how accurately the pile model, hammer model, and soil model reflect real conditions. Garbage in, garbage out applies with particular force to wave equation analysis.

Several boundaries shape what the software can and cannot resolve:

Soil model uncertainty. CPT-based soil modelling for pile driving translates cone resistance profiles into shaft and toe resistance parameters using empirical correlations. These correlations carry inherent uncertainty, particularly in layered soils, chalk, or other materials with complex behaviour. AllWave-PDP can run sensitivity analyses across a range of SRD values, but it cannot eliminate the underlying uncertainty in the soil model itself.

Signal matching as a calibration check. When Dynamic Load Testing data is available from a nearby pile or a restrike test, AllWave-DLT signal matching provides a direct way to calibrate the soil model. Measured force and velocity signals at the pile head are used as boundary conditions, and soil parameters are adjusted iteratively until the calculated response matches the measured response. This process improves the soil model but does not produce a unique solution. Different parameter combinations can yield similar signal matches, so engineering judgment and sensitivity analysis remain necessary even after a good match is achieved.

Pile model accuracy. Reliable results require accurate input for pile geometry, wall thickness, material properties, cross-section changes, welds, and connections. Impedance changes along the pile length cause local stress wave reflections, and if these are not modelled correctly, the stress distribution results will be misleading regardless of how many runs the software executes.

The AllWave-PDP manual frames this honestly as The Art of Prediction: drivability engineering rests on models and simulations, but it remains dependent on engineering judgment when interpreting soil behaviour and assessing whether hammer performance assumptions are realistic. The goal is not to trust software output blindly but to know when inputs are reliable, when assumptions need to be questioned, and when additional data or calibration is needed.

How do AllWave-PDP results feed into pile installation planning?

AllWave-PDP results feed directly into pile installation planning by translating wave equation outputs into actionable installation criteria: acceptable blow count ranges at each depth, structural stress limits that define hammer energy boundaries, refusal criteria that trigger a stop or equipment change, and fatigue accumulation data that informs structural design checks. These outputs give installation teams a quantitative basis for decisions before the first pile enters the ground.

The most useful planning outputs from a completed AllWave-PDP study include:

Blow count versus penetration curves for each hammer and SRD scenario, showing where installation is straightforward and where it becomes demanding
Maximum compression and tension stress profiles along the pile, which set the upper energy limits the hammer can apply without risking pile damage
Identification of critical depths where high blow counts, stress peaks, or low energy transfer coincide with difficult soil layers
Installation time estimates based on blow count and hammer stroke rate, which support vessel scheduling and cost planning
Fatigue cycle accumulation over the full installation sequence, which feeds into structural fatigue assessments for the pile itself

These results do not end at the planning stage. The most powerful approach treats the drivability prediction as the starting point of a learning loop. During installation, monitoring data from the actual driving process is compared against the predicted blow count curves. Where deviations appear, signal matching and back-analysis update the soil model. The updated model then improves predictions for remaining piles on the same project or for future projects in similar ground conditions. A drivability prediction is therefore not a single calculation delivered before installation begins but an evolving technical asset that becomes more accurate as real installation data accumulates.

How Allnamics Supports Your Drivability Calculations

We provide drivability studies using AllWave-PDP and AllWave-VDP as part of a structured engineering service that covers the full calculation workflow, from initial soil modelling to post-installation back-analysis. Our approach treats each study as a prediction that will be tested against real installation behaviour, not a one-time deliverable.

Working with us on drivability calculations gives your team access to:

CPT-based soil modelling that translates your ground investigation data into calibrated shaft and toe resistance profiles for both impact and vibratory driving scenarios
Full parameter sweep studies covering upper-bound, lower-bound, and best-estimate SRD scenarios across all relevant penetration depths
Hammer selection support based on blow count, stress, and energy transfer results across multiple equipment options
Stress and fatigue analysis that checks pile integrity throughout the installation sequence, not just at final depth
Signal matching and back-analysis using AllWave-DLT to calibrate soil models against measured Dynamic Load Testing data
Vibratory Driving Prediction through AllWave-VDP for projects where a vibro hammer is part of the installation plan
Iterative model updates that use installation monitoring data to refine predictions for subsequent piles or future projects

If your project involves complex soil conditions, multiple pile types, or tight installation windows where refusal risk or pile damage could have serious schedule and cost consequences, a structured AllWave-PDP study gives your team the technical foundation to plan with confidence. Contact us to discuss your drivability study requirements.