Table Environmental Performance Requirements for Ground movement and land stability Draft EES evaluation objective Environmental Performance Requirements Proposed mitigation measures Precinct Timing Risk No. Land Stability Develop and maintain geological and groundwater All Design/ While not specifying required models (as per the Environmental Performance Construction recommended Environmental To avoid or – Requirements GW2) Requirements are framed to ensure minimise mitigation and management adverse Use monitored ground movement and groundwater adopted and implemented in the effects on land levels prior to construction to identify pre-existing construction of Melbourne Metro. stability that movement might arise also to the potential impact Inform tunnel design and the construction techniques directly or measures identified in the ground to be applied for the various geological and indirectly from assessment tables provided for each groundwater conditions project works Assess potential drawdown and identify trigger levels for implementing additional mitigation measures to minimise potential primary consolidation settlement Assess potential ground movement effects from excavation and identify trigger levels for implementing additional mitigation measures to minimise potential ground movement effects. Design and construct the permanent structures and All Design temporary works to limit ground movements to within appropriate acceptability criteria (to be determined in consultation with relevant stakeholders) for vertical, horizontal, and angular deformation as appropriate for project activities during the construction and operational phase.
Table Environmental Performance Requirements for Ground movement and land stability Draft EES evaluation objective Environmental Performance Requirements Proposed mitigation measures Precinct Timing Risk No. Land Stability – To avoid or minimise adverse effects on land stability that might arise directly or indirectly from project works Develop and maintain geological and groundwater models (as per the Environmental Performance Requirements GW2) Use monitored ground movement and groundwater levels prior to construction to identify pre-existing movement Inform tunnel design and the construction techniques to be applied for the various geological and groundwater conditions Assess potential drawdown and identify trigger levels for implementing additional mitigation measures to minimise potential primary consolidation settlement Assess potential ground movement effects from excavation and identify trigger levels for implementing additional mitigation measures to minimise potential ground movement effects. While not specifying required recommended Environmental Requirements are framed to ensure mitigation and management adopted and implemented in the construction of Melbourne Metro. also to the potential impact measures identified in the ground assessment tables provided for each All Design/ Construction Design and construct the permanent structures and temporary works to limit ground movements to within appropriate acceptability criteria (to be determined in consultation with relevant stakeholders) for vertical, horizontal, and angular deformation as appropriate for project activities during the construction and operational phase. All Design
MMRP_Chapter-19_Ground-Movement.docx