DL/T 2155-2020 in English
VALIDCode for assessment of dam safety monitoring system
- Issued on:2020-10-23
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
$582.00
Introduction
Interpretation of the core content of the standard
This standard specifies the completeness rating factors and reliability test methods for concrete dams, earth-rock dams and slope monitoring systems, and emphasizes comprehensive evaluation through on-site inspection, data review and data analysis.
Monitoring system completeness evaluation system
| Evaluation dimensions | Key indicators of gravity dam | Key indicators of earth-rock dam |
|---|---|---|
| Deformation monitoring | Coverage rate of dam body/dam foundation displacement measurement points ≥80% | Spacing between surface deformation measurement points ≤50m |
| Seepage monitoring | Longitudinal uplift pressure monitoring section integrity | Vertical spacing between infiltration line measurement points ≤15m |
| Patrol inspection | Frequency of inspection of important parts ≥1 time/month | |
Key points of reliability evaluation technology
Take differential resistance instrument as an example:
- Short-term stability: resistance ratio range ≤3×10-4
- Insulation performance: core wire to ground resistance ≥0.1MΩ
- Field testing must include positive and negative resistance ratio verification
Standard implementation recommendations
Monitoring system upgrade path
- When the permanent monitoring project is rated as incomplete, priority should be given to adding deep deformation monitoring facilities
- Automation system data loss rate＞3%, communication module transformation is required
- A correction and tracing mechanism should be established for abnormal values of historical data
Handling of special working conditions
For arch dams above 200m, the valley deformation monitoring project should be added, and the survey line layout should reflect the change of chord length at different elevations (see standard Appendix B for theoretical accuracy calculation method).
Technology evolution analysis
Compared with the old version of the standard, the 201X version has the following major breakthroughs:
- Newly added vacuum laser alignment system vacuum degree maintenance index (<20kPa/168h)
- Clearly define the coupling requirements of slope monitoring and exploration profiles
- Introduce the concept of full life cycle management of monitoring facilities
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