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Civil Engineering Question

Explain how slurry and EPBM machines work. Explain the difference among a regular shield, a slurry shield and a EPBM.
Soft ground tunneling, when performed, must be performed safely. Therefore, you should be aware that there are several types of machines. Knowing when each machine should be used is important so that only one type of machine is used for a project. Considering that soft ground tunneling can be more difficult in some ways, it is important that you understand what can be done. Prepare a 2 page paper discussing the usage of the different types of soft ground machines. Sketches or photos may also be useful.