engineering

Rubble

Rubble is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Rubble rather than just read about it. In short: Rubble is broken stone, of irregular size, shape and texture; undressed especially as a filling-in. Rubble naturally found in the soil is known also as 'brash' (compare cornbrash).

Key takeaways

Rubble belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Rubble to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Rubble from memory before moving on to harder problems.

Reference excerpt

Rubble is broken stone, of irregular size, shape and texture; undressed especially as a filling-in. Rubble naturally found in the soil is known also as 'brash' (compare cornbrash). Where present, it becomes more noticeable when the land is ploughed or worked.

Building

"Rubble-work" is a name applied to several types of masonry. One kind, where the stones are loosely thrown together in a wall between boards and grouted with mortar almost like concrete, is called in Italian "muraglia di getto" and in French "bocage". In Pakistan, walls made of rubble and concrete, cast in a formwork, are called 'situ', which probably derives from Sanskrit (similar to the Latin 'in situ' meaning 'on the spot'). Work executed with more or less large stones put together without any attempt at courses is called rubble walling. Where similar work is laid in courses, it is known as coursed rubble. Dry-stone walling is somewhat similar work done without the use of mortar. It is bound together by the fit of the stones and the regular placement of stones which extend through the thickness of the wall. A rubble wall built with mortar will be stronger if assembled in this way.

Rubble walls in Malta

Rubble walls (Maltese: ħitan tas-sejjieħ) are found all over the island of Malta. Similar walls are also frequently found in Sicily and the Arab countries. The various shapes and sizes of the stones used to build these walls look like stones that were found in the area lying on the ground or in the soil. It is most probable that the practice of building these walls around the field was inspired by the Arabs during their rule in Malta, as in Sicily which was also ruled by the Arabs around the same period. Maltese farmers found that this method of building these walls was very efficient especially when resources were limited. Rubble walls are used to serve as borders between farms. A great advantage that rubble walls offered is that when heavy rain falls, their structure would allow excessive water to pass through and therefore, excess water will not ruin the products. Soil erosion is minimised as the wall structure allows the water to pass through but it traps the soil and prevents it from being carried away from the field. One can see many rubble walls on the side of the hills and in valleys where the land slopes down and consequently the soil is in greater danger of being carried away.

Rubble in Britain In the British Islands, many mediaeval and post-mediaeval buildings are built of small natural stones, called rubble. As examples see the descriptions in two official list entries, provided by Historic England:

No. 1191625 – Parish Church of the Holy Trinity, Chuckfield No. 1139238 – Church of St Mary, Longnewton, 1856/57

See also Backfill – material used to refill a disused trench Blockfield – Surface covered by irregular rocks, a 'Boulder field' Core-and-veneer – Wall building technique Debris – Scattered remains of something destroyed or discarded Riprap – Rock or concrete protective armour Ruin – Remains of human-made architecturePages displaying short descriptions of redirect targets Rubble trench foundation – Foundation construction approach

References

External links

Example of a coursed rubble wall in Malta

Illustrations

Worked examples

Example 1 — a first encounter with Rubble

Start with the simplest possible case. Write down what Rubble claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Rubble before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Rubble ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Rubble

In research: Rubble appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Rubble in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Rubble is common in secondary-school and first-year university syllabi. It links to neighbouring topics Building engineering, Building materials, Building stone, so understanding it makes those chapters shorter.
In everyday life: Look for Rubble outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Rubble in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Rubble means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Rubble out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Rubble in simple terms?

Rubble is broken stone, of irregular size, shape and texture; undressed especially as a filling-in. Rubble naturally found in the soil is known also as 'brash' (compare cornbrash).

Why does Rubble matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Rubble?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Rubble.