Active learning ideas
Engineering geology is the practical application of geological knowledge to the built environment. In this final topic, students learn how the physical properties of rocks, such as porosity, permeability, and load-bearing strength, influence the design of dams, tunnels, and waste disposal sites. They investigate how geological structures like faults or joints can become 'pathways' for failure if not properly accounted for.
Activity 01
Groups are given three potential sites for a new hydroelectric dam. They must analyse the rock types (e.g., porous sandstone vs. solid granite) and the 'dip' of the strata to decide which site is safest from leakage or collapse, then present their 'tender' to the class.
Why is rock porosity and permeability important for waste disposal?
Activity 02
Using clear tubes filled with different materials (gravel, sand, clay), students measure how much water they can hold (porosity) and how fast water flows through them (permeability). They then relate this to which rocks make the best 'liners' for a landfill site.
What geological factors must be considered when building a dam?
Activity 03
Students are shown a diagram of a tunnel cutting through a fault zone. They must discuss in pairs what problems the engineers might face (e.g., water ingress, rock falls) and suggest one way to 'reinforce' the tunnel, then share with the group.
How do faults affect tunnel construction?
A few notes on teaching this unit
Watch Out for These Misconceptions
A rock that is porous must also be permeable.
Pumice is very porous (lots of holes) but has low permeability because the holes aren't connected. Clay is also very porous but has tiny, disconnected pores. A simple 'race' between water through sand vs. clay helps students see that connectivity is key to flow.
Granite is always the best rock for building.
While strong, granite can have 'joints' (cracks) that allow water to seep through, which can be disastrous for a dam or a tunnel. Peer-led analysis of 'jointing patterns' helps students see that even the strongest rock has weaknesses.
Methods used in this brief
Managing Geological Hazards
Pupils will evaluate the risks associated with geohazards such as landslides, tsunamis, and sinkholes. They will explore methods for predicting and mitigating these events to protect human populations.
8 methodologies
Extraction of Earth Resources
This topic covers the formation and extraction of economic resources, including metal ores, fossil fuels, and construction materials. Pupils will consider the environmental impacts of mining and quarrying.
8 methodologies