---
title: "Factors influencing choice of foundation"
subject: "Foundation Engineering"
chapter: 1
key: "semester_5/foundation_engineering:factors-choice-foundation"
source: https://www.bctengineer.com/q/semester_5/foundation_engineering/factors-choice-foundation
site: BCT Engineering
---

# Factors influencing choice of foundation

Foundation Engineering · Chapter 1: Introduction

- Asked in: 2078 Kartik, 2 marks; 2075 Chaitra, 2 marks (asked 2 times)
- Video: [Factors affecting foundation , purpose of foundations, Types of foundations](https://www.youtube.com/watch?v=KCBZdaizqR4) — Bhavik Joshi
- Answer checked by Claude Sonnet 5.5 on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_5/foundation_engineering/factors-choice-foundation
- Whole chapter: https://www.bctengineer.com/md/semester_5/foundation_engineering/chapter-1

## Question

What are the factors that influence the choice of a foundation?

## Short answer

Factors include soil profile and bearing capacity, load magnitude and type, structure sensitivity to settlement, depth needs (frost, scour), groundwater, seismic conditions, adjacent structures, construction resources and local codes, and overall economy.

## Answer

The choice of foundation depends on the following factors.

1. **Soil profile and properties:** bearing capacity, compressibility, depth of good stratum, groundwater level, swelling/collapsible soils.
2. **Type and magnitude of load:** heavy or light, vertical, lateral, uplift, dynamic loads.
3. **Type of structure:** building, bridge, tower, machine; sensitivity to differential settlement.
4. **Depth of foundation:** frost depth, scour, seasonal moisture change, adjacent foundations.
5. **Groundwater:** need for dewatering, buoyancy, aggressive chemicals.
6. **Seismic and site conditions:** liquefaction, slope stability, nearby buildings, access for equipment.
7. **Construction factors:** available materials, labour, equipment, time.
8. **Economy:** cost of the foundation against the whole structure; the simplest safe type is preferred.
9. **Codes and local regulations**, such as NBC and municipal rules.

## Check yourself

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

1. Which soil information is the first factor influencing foundation choice?
   A. Only the colour of the soil
   B. Only the cost of excavation
   C. Only the building height
   D. Bearing capacity, compressibility, depth of good stratum and groundwater level
   Answer: D. The soil profile and its properties largely decide which foundation is feasible. (Key point: Soil profile)

2. Why does the type of structure matter in choosing a foundation?
   A. All structures need identical foundations
   B. Some structures are sensitive to differential settlement and carry special loads like uplift or lateral force
   C. It only changes the colour of the concrete
   D. It decides only the formwork
   Answer: B. Bridges, towers and machines have different load types and settlement tolerance. (Key point: Load and structure)

3. In choosing among safe options, which is preferred?
   A. The most complex type for extra safety
   B. Always the deepest type
   C. The simplest safe and economical type
   D. The type needing most equipment
   Answer: C. Economy compares foundation cost with the whole structure; the simplest safe type wins. (Key point: Economy)

## Related in Foundation Engineering

- [Factors for selection; strap and combined footings](https://www.bctengineer.com/question.md?key=semester_5%2Ffoundation_engineering%3Afactors-strap-combined) — Foundation Engineering, chapter 1
- [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×
- [Footing 2 m × 3 m, chart factors, eccentricity](https://www.bctengineer.com/question.md?key=semester_5%2Ffoundation_engineering%3Afooting-2x3-eccentric-skempton) — Foundation Engineering, chapter 6
- [Factors affecting selection of pile type](https://www.bctengineer.com/question.md?key=semester_5%2Ffoundation_engineering%3Apile-type-selection-factors) — Foundation Engineering, chapter 8

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