Any work being conducted off campus will be subject to risk assessment as per any other aspect of the research. The difference here will be that there will be additional risks that are outside of the University control that will also need to be considered during the planning stage.
It is critical to consider who is in control and who is responsible for the management of the activities that the students are going to be engaged in. Where others are in control or dictating the way in which the work will be conducted, the more information should be asked of these 'others' in order to establish how risks will be managed.
Similarly if working on another site, questions should be raised about the environment in which your students will be working to ensure that these are considered in connection with the planned activity again to ensure that risks can be managed sufficiently.
If the research is to be conducted in an unfamiliar area, with the work being in sole control of the University, then it will be the sole responsibility of the University to gather sufficient information together to identify the hazards and to demonstrate how the risks will be managed. Where this involves students under your control, then it is vital that you understand the relevant University policies and arrangements connected with:
Departments may have their own methods for recording risk assessments connected with the above. Ensure that you know what these methods are if this applies to you.