Protecting Adjacent Sensitive Structures: Dilapidation Surveys and Building Impact Assessments (BIA)
Key Takeaways Adjacent structures can be affected by excavation, vibration, groundwater changes, temporary works, and construction loading. A carefully planned survey and building impact assessment creates a factual baseline for protection, monitoring, and fair resolution of disputes. Record existing conditions before construction begins. Assess both the building and the proposed construction effects. Give vulnerable structures […]
Groundwater Control in Deep Excavations: Dewatering Permits & Seepage Analysis Submissions
Key Takeaways Deep excavation dewatering is both a geotechnical design problem and an authority-submission exercise. A defensible submission connects the ground model, seepage calculations, environmental controls, and field monitoring into one coherent basis. Define excavation stages, groundwater-control objectives, and measurable performance criteria before selecting equipment. Build the ground model from investigation data, groundwater observations, and […]
Setting Alert, Action, and Limit (AAL) Levels for ERSS in Urban Singapore
Key Takeaways A defensible ERSS AAL framework turns monitoring data into timely, proportionate decisions. It must be grounded in the design, the site baseline, Singapore’s regulatory setting, and clear responsibilities. Establish movement objectives before selecting trigger values. Build the baseline risk profile before excavation begins. Match instruments and thresholds to each receptor and construction stage. […]
Slope Stabilisation & Soil Nailing: Submission Workflows for Temporary Hillside Excavations
Key Takeaways A defensible hillside excavation submission connects the ground model, temporary works design, authority requirements, and construction controls from the beginning. Define the temporary and permanent works interfaces before design responsibility becomes unclear. Investigate soil, rock, groundwater, drainage, adjacent assets, and existing utilities proportionately to risk. Verify soil nailing against local and global failure […]
Common Reasons BCA Rejects Temporary ERSS Submissions (And How to Avoid Them)
Key Takeaways Temporary ERSS submissions are commonly returned when the technical evidence, drawings, design assumptions, and authority responses do not form one clear and verifiable package. Confirm that every required form, report, calculation, drawing, and supporting record is included. Base the ERSS design on current site investigation, groundwater, utility, and neighbouring-structure information. Show the design […]
The Annex C & Annex E Workflow: On-Site ERSS Compliance During Execution
Key Takeaways ERSS compliance during execution depends on disciplined supervision, clear authority, and records that connect site actions to approved design and monitoring requirements. Annex C controls the construction and inspection workflow for ERSS works. Annex E provides the monitoring, threshold, and response framework. The RE, RTO, and Site Manager need distinct but coordinated responsibilities. […]
The Cost of ERSS Submissions in Singapore: Breakdown of Consultant Fees, Checking Fees, and Testing
Key Takeaways ERSS costs depend on the excavation, ground conditions, design responsibility, checking requirements, and the level of construction-stage support needed. A useful budget separates professional fees from testing, monitoring, authority coordination, and risk allowances. ERSS is a temporary earth-retaining system used to support excavations and control ground movement. Consultant fees rise with excavation depth, […]
Leveraging AI and Machine Learning in Geotechnical Back-Analysis for ERSS Submissions
Key Takeaways AI can make geotechnical back-analysis faster and more consistent, but it does not replace the Professional Engineer responsible for the design and submission. The strongest ERSS workflows connect trustworthy monitoring data, calibrated numerical models, transparent assumptions, and clear authority evidence. Back-analysis helps reveal how soil, groundwater, support systems, and adjacent structures behave in […]
Formulating an Instrumentation & Monitoring (I&M) Plan for BCA ERSS Approval
Key Takeaways A sound I&M plan connects ERSS design assumptions with measurable site behaviour and clear decisions. It should be prepared as a working safety document, not merely as an attachment to an approval submission. Define the plan’s purpose, scope, responsibilities, and approval pathway before construction. Base monitoring locations and instrument types on ground conditions, […]
Eurocode 7 Application: Sizing Permanent ERSS using SS EN 1997-1 Singapore National Annex
Key Takeaways Permanent ERSS design in Singapore requires more than selecting a wall section. It depends on a clear design basis, reliable ground and groundwater information, correct Eurocode 7 design approaches, and coordinated construction-stage controls. Define the retaining system, design life, design situations, and movement criteria before sizing members. Build characteristic soil and groundwater parameters […]