1. Geotechnical Investigation Review
- Review geotechnical investigation reports, borehole logs and soil/rock profiles.
- Assess soil and groundwater conditions along the Metro alignment.
- Review laboratory and field test results such as SPT, CPT, permeability, UCS and other relevant tests.
- Identify gaps in investigation and recommend additional investigations where required.
2. Underground Metro & Tunnel Works
- Review geotechnical aspects of underground stations, tunnels, shafts and cross passages.
- Assess ground conditions for TBM/NATM/cut-and-cover construction, as applicable.
- Review ground classification and expected geological/geotechnical risks.
- Provide recommendations for excavation and ground-support requirements.
3. Foundation & Structural Works
- Review geotechnical parameters for foundations of stations, viaducts, depots and ancillary structures.
- Review bearing capacity, settlement and foundation recommendations.
- Assess pile foundations, pile capacity, lateral capacity and pile-group behaviour.
- Review foundation-related design calculations and contractor submissions.
4. Excavation & Temporary Works
- Review excavation support systems such as:
- Diaphragm walls
- Secant/contiguous piles
- Sheet piles
- Strutting systems
- Anchors
- Assess excavation stability and potential ground movement.
- Review dewatering arrangements and their impact on surrounding structures.
5. Groundwater & Dewatering
- Assess groundwater levels and hydrogeological conditions.
- Review groundwater control and dewatering proposals.
- Monitor risks of piping, uplift, seepage and excessive drawdown.
- Assess potential impact of underground construction on nearby buildings and utilities.
6. Settlement & Ground Movement
- Review predicted ground settlement and deformation.
- Monitor settlement associated with tunnelling and deep excavation.
- Review instrumentation and monitoring data.
- Recommend mitigation measures where settlement or ground movement exceeds acceptable limits.
7. Construction Supervision & Monitoring
- Inspect geotechnical aspects of construction works.
- Verify actual ground conditions against design assumptions.
- Review excavation faces, rock/soil conditions and support systems.
- Provide technical recommendations when unexpected ground conditions are encountered.
8. Tunnel / TBM Support
- Provide geotechnical input for TBM alignment and tunnelling methodology.
- Review geological/geotechnical baseline information.
- Assess risks such as weak zones, boulders, rock fractures, water ingress and mixed-face conditions.
- Support decisions regarding ground treatment, grouting and excavation parameters.
9. Technical Document Review
Review and comment on:
- Geotechnical investigation reports
- Geological profiles
- Foundation design reports
- Tunnel/geotechnical design reports
- Excavation and shoring designs
- Dewatering proposals
- Ground improvement proposals
- Method statements
- Instrumentation & monitoring plans
- Contractor's technical submissions and RFIs
10. Ground Improvement
- Review proposals for ground improvement and treatment.
- Assess suitability of grouting, jet grouting, soil improvement and other techniques.
- Monitor effectiveness of ground-treatment measures through appropriate testing and monitoring.
11. Interface Coordination
Coordinate with:
- Structural Engineers
- Underground/Tunnelling Engineers
- Civil Engineers
- TBM teams
- Survey teams
- Hydrology/dewatering specialists
- Contractors and design consultants
- Utility and architectural teams
12. Quality, Safety & Risk Management
- Ensure geotechnical works comply with project specifications and applicable codes/standards.
- Identify geotechnical risks and recommend mitigation measures.
- Review NCRs and corrective actions related to geotechnical works.
- Support safe excavation and tunnelling practices.