29-12-2012, 12:31 PM
Construction Monitoring
[attachment=45728]
Reasons for Construction Monitoring
Ensure proper materials are used
Ensure proper construction and design is followed
Quickly modify design and construction practices based on encountered site conditions
Inspection Requirements
Must not hinder or slow down contractor
Must work with contractor
Must consider contractor construction practices
Construction Monitoring
MATERIALS
Grain size distribution analysis of materials
Core, filters, drains
Make sure material installed meets specifications
Make sure that the borrow materials do not change…
Proctor Tests
Source materials in borrow pit
Materials hauled to site
Field Compaction
Uncompacted layer thickness (300mm max)
Compaction equipment is suitable
Moisture content and Maximum dry density
Nuclear Density, sand cone, rubber balloon
Make sure Nuclear density is calibrated
Soil Compaction Measurement
Use radioactive material to get moisture content and soil density
Quick method
Reliable if calibrated
Radioactive device therefore special transportation and rules must be followed
Justification for Instrumentation
Engineers should developed justifications for geotechnical instrumentation program on their projects
In practice such programs are used to save lives, save money and/ or reduce risk of failure
In concept, these are simple and easy to understand benefits but in practice it is difficult to quantify
Key Components for Design of Instrumentation
Put in redundancy
Instruments will get lost due to construction activities
Equipment will stop working
Protect equipment from contractors
Put in safe areas
Mark equipment
Protect it during installation and post installation
Spend money so can remotely monitor and collect data
Consider data analysis cost
[attachment=45728]
Reasons for Construction Monitoring
Ensure proper materials are used
Ensure proper construction and design is followed
Quickly modify design and construction practices based on encountered site conditions
Inspection Requirements
Must not hinder or slow down contractor
Must work with contractor
Must consider contractor construction practices
Construction Monitoring
MATERIALS
Grain size distribution analysis of materials
Core, filters, drains
Make sure material installed meets specifications
Make sure that the borrow materials do not change…
Proctor Tests
Source materials in borrow pit
Materials hauled to site
Field Compaction
Uncompacted layer thickness (300mm max)
Compaction equipment is suitable
Moisture content and Maximum dry density
Nuclear Density, sand cone, rubber balloon
Make sure Nuclear density is calibrated
Soil Compaction Measurement
Use radioactive material to get moisture content and soil density
Quick method
Reliable if calibrated
Radioactive device therefore special transportation and rules must be followed
Justification for Instrumentation
Engineers should developed justifications for geotechnical instrumentation program on their projects
In practice such programs are used to save lives, save money and/ or reduce risk of failure
In concept, these are simple and easy to understand benefits but in practice it is difficult to quantify
Key Components for Design of Instrumentation
Put in redundancy
Instruments will get lost due to construction activities
Equipment will stop working
Protect equipment from contractors
Put in safe areas
Mark equipment
Protect it during installation and post installation
Spend money so can remotely monitor and collect data
Consider data analysis cost