---
title: "Laterally loaded piles with examples"
subject: "Foundation Engineering"
chapter: 8
key: "semester_5/foundation_engineering:laterally-loaded-piles"
source: https://www.bctengineer.com/q/semester_5/foundation_engineering/laterally-loaded-piles
site: BCT Engineering
---

# Laterally loaded piles with examples

Foundation Engineering · Chapter 8: Pile Foundations

- Asked in: 2080 Baisakh, 3 marks
- Video: [Laterally Loaded Piles](https://www.youtube.com/watch?v=sEgWN8NknHw) — AXE Consultants
- Answer checked by Claude Sonnet 5.5 on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_5/foundation_engineering/laterally-loaded-piles
- Whole chapter: https://www.bctengineer.com/md/semester_5/foundation_engineering/chapter-8

## Question

Describe briefly the laterally loaded piles with suitable examples.

## Short answer

Laterally loaded piles resist horizontal forces (e.g., retaining walls, jetties, towers). They transfer load by soil reaction, bending like a beam on elastic foundation. Analysis uses Broms' method, subgrade reaction or p–y curves; capacity increases with larger diameter or batter piles.

## Answer

A **laterally loaded pile** is a pile that has to resist horizontal forces or moments in addition to (or instead of) vertical load. The load is transferred to the soil by lateral soil reaction along the shaft, and the pile bends like a beam on an elastic foundation.

#### Examples
- Piles under **retaining walls, bridge abutments and quay walls** (earth and water pressure).
- **Jetties, wharves and offshore platforms** subject to waves, berthing and mooring forces.
- **Transmission towers, tall chimneys and high-rise buildings** due to wind and earthquake.
- **Bridge piers** subject to braking forces and flowing water.

#### Behaviour and analysis
- **Short (rigid) piles** fail by rotation of the pile or by failure of the soil. **Long (flexible) piles** fail by yielding of the pile material, with a plastic hinge.
- Analysis: **Broms' method** (ultimate lateral load for short and long piles in cohesive and cohesionless soil), **subgrade reaction method** (Winkler spring model with $k_h$), and **p–y curves** for non-linear soil.
- The lateral capacity is increased by larger diameter, by fixity to the cap, or by using **batter (inclined) piles** to carry the horizontal component.

## Check yourself

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

1. A laterally loaded pile resists:
   A. Horizontal forces or moments
   B. Only vertical load
   C. Only uplift
   D. No load
   Answer: A. Load is transferred by lateral soil reaction. (Key point: Definition)

2. A short rigid pile fails by:
   A. Rotation or soil failure
   B. Plastic hinge
   C. Buckling
   D. Corrosion
   Answer: A. Long piles fail by yielding with a plastic hinge. (Key point: Short pile failure)

3. Which is a method of analysis?
   A. Broms' method
   B. Hiley formula
   C. Skempton
   D. Vesic
   Answer: A. Also subgrade reaction and p-y curves. (Key point: Analysis)

4. Lateral capacity increases by:
   A. Larger diameter or batter piles
   B. Smaller diameter
   C. Free head
   D. Shorter piles
   Answer: A. Stiffer, fixed or inclined piles carry more. (Key point: Capacity increase)