Active learning ideas
Infrastructure projects, from high-speed rail to nuclear waste repositories, depend on a thorough understanding of the ground beneath them. This topic explores the 'site investigation' process, where geologists use boreholes, trial pits, and geophysical surveys to build a model of the subsurface. Students analyze famous engineering failures, such as the St. Francis Dam or the Vaiont Dam, to learn how poor geological understanding can lead to catastrophe. The curriculum also covers the unique challenges of 'geological disposal' for hazardous waste, requiring stability over thousands of years.
Activity 01
Students are assigned roles (geologist, engineer, politician, local resident) to investigate a historical dam failure. They must present evidence from 'site reports' to determine if the failure was due to 'unforeseen' geology or professional negligence.
Why is a thorough site investigation crucial before constructing a dam?
Activity 02
Display posters of different investigation techniques (e.g., SPT tests, RQD values, seismic refraction). Students move around to identify which tool is best for specific problems, such as finding the depth to bedrock or measuring soil strength.
What geological hazards are associated with tunnelling through fault zones?
Activity 03
Groups are given geological maps of three potential sites for a nuclear waste repository. They must evaluate each site based on rock type, tectonic stability, and hydrogeology, eventually selecting the 'safest' site and defending their choice.
How are geological barriers used in the disposal of radioactive waste?
A few notes on teaching this unit
Watch Out for These Misconceptions
A site investigation is just 'drilling a few holes'.
It is a systematic process of building a 3D model; the location and depth of boreholes must be strategically chosen based on the project. Using 'mystery borehole' activities helps students see that where you *don't* look can be as important as where you do.
Engineering can fix any geological problem.
Some geological settings are simply too dangerous or expensive to build on. Peer discussion about 'residual risk' helps students understand that the geologist's job is often to say 'no' to a project for safety reasons.
Methods used in this brief
Rock Mechanics and Ground Stability
Students apply principles of physics to understand rock strength, stress, and strain. They will evaluate how geological structures like faults and joints influence the stability of engineering projects.
8 methodologies
Anthropogenic Climate Change and the Anthropocene
Students synthesise their geological knowledge to evaluate the concept of the Anthropocene as a new geological epoch. They will examine the long-term geological signature of human activity on the Earth system.
8 methodologies