---
title: "Approaches to estimate pile capacity"
subject: "Foundation Engineering"
chapter: 8
key: "semester_5/foundation_engineering:pile-capacity-approaches"
source: https://www.bctengineer.com/q/semester_5/foundation_engineering/pile-capacity-approaches
site: BCT Engineering
---

# Approaches to estimate pile capacity

Foundation Engineering · Chapter 8: Pile Foundations

- Asked in: 2074 Chaitra, 1 marks
- Video: [How to determine the pile capacity.](https://www.youtube.com/watch?v=Jdcs8-i_OA4) — Structural Engineer Calcs
- Answer checked by Claude Sonnet 5.5 on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_5/foundation_engineering/pile-capacity-approaches
- Whole chapter: https://www.bctengineer.com/md/semester_5/foundation_engineering/chapter-8

## Question

What are the various approaches used to estimate the vertical load bearing capacity of a pile?

## Short answer

Vertical load capacity is estimated by static (analytical) formulas using soil properties, dynamic formulae from driving data, in-situ SPT/CPT correlations, and pile load tests—the most reliable method.

## Answer

The vertical load capacity of a pile can be estimated by:
1. **Static (analytical) methods:** from soil properties using the formula $Q_u = Q_p + Q_s$ ($\alpha$-, $\beta$- and $\lambda$-methods, Meyerhof, Terzaghi).
2. **Dynamic formulae:** from the pile driving data (Engineering News, Hiley, Danish formulae) and the wave equation.
3. **In-situ penetration tests:** SPT and CPT correlations (Meyerhof).
4. **Pile load test:** direct test on a trial or working pile, the most reliable.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Most reliable approach is:
   A. Dynamic formula
   B. Pile load test
   C. Static formula
   D. Visual estimate
   Answer: B. Direct testing of a pile gives actual behaviour. (Key point: Most reliable)

2. Static methods use:
   A. Soil properties with Qu = Qp + Qs
   B. Driving set only
   C. Hammer weight
   D. Nothing
   Answer: A. End bearing plus shaft friction from soil properties. (Key point: Static method)

3. Dynamic formulae use:
   A. Pile driving data
   B. Water table
   C. Plate test
   D. CPT
   Answer: A. E.g. Hiley and Engineering News. (Key point: Dynamic)

## Related in Foundation Engineering

- [Pile capacity in sand, group effect, load test](https://www.bctengineer.com/question.md?key=semester_5%2Ffoundation_engineering%3Apile-capacity-sand-group-load-test) — Foundation Engineering, chapter 8
- [Bearing capacity from plate load curve](https://www.bctengineer.com/question.md?key=semester_5%2Ffoundation_engineering%3Abc-from-load-settlement-sand) — Foundation Engineering, chapter 6
- [Allowable load of 400 mm pile, layered soil](https://www.bctengineer.com/question.md?key=semester_5%2Ffoundation_engineering%3Apile-400mm-layered-soil-chart) — Foundation Engineering, chapter 8
- [Factors affecting bearing capacity; water table](https://www.bctengineer.com/question.md?key=semester_5%2Ffoundation_engineering%3Abearing-capacity-factors-water-table) — Foundation Engineering, chapter 6, asked 5×
- [Development of classical bearing capacity theories](https://www.bctengineer.com/question.md?key=semester_5%2Ffoundation_engineering%3Aclassical-bearing-theories-development) — Foundation Engineering, chapter 6, asked 2×
- [Mat bearing capacity: cohesive vs cohesionless](https://www.bctengineer.com/question.md?key=semester_5%2Ffoundation_engineering%3Amat-bc-cohesive-vs-cohesionless) — Foundation Engineering, chapter 7, asked 2×

## Related in other subjects

- [Soil exploration and improving bearing capacity](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Asoil-exploration-improving-bc-nepal) — Building Technology, chapter 2
- [Methods of improving bearing capacity](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Aimproving-bc) — Building Technology, chapter 2, asked 2×
- [Methods of determining bearing capacity](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Abc-determination-methods) — Building Technology, chapter 2, asked 2×
- [Safe and ultimate bearing capacity, improvement](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Abc-define-improve-066j) — Building Technology, chapter 2