DL/T 5809-2020 in English
VALIDTechnical code for hydroelectric reservoir area safety monitoring
- Issued on:2020-10-23
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
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Introduction
Analysis of the core content of the standard
| Monitoring type | Key indicators | Monitoring frequency | Technical means |
|---|---|---|---|
| Landslide monitoring | Deformation, seepage, anchor stress | Once a month (more frequent during flood season) | GNSS/inclinometer/displacement meter |
| Debris flow monitoring | Precipitation, soil moisture content, material source deformation | Real-time online monitoring | Infrared detector/video monitoring |
| Reservoir monitoring | Vertical displacement, horizontal displacement | Once a year | First-class leveling |
Technology evolution and standard background
This standard is based on the 2017 Energy Industry Standard Revision Plan and integrates the monitoring experience of 300m-class high dams such as Ertan and Xiluodu. Compared with the old version of the specification, the following is added:
- Requirements for deformation monitoring of source bodies in debris flow formation areas
- Electromagnetic interference protection standards for GNSS reference stations (≥200m)
- Provisions for real-time analysis of automated monitoring data
Key implementation points
Landslide monitoring case
The reservoir area of a power station adopts a combined monitoring of borehole inclinometer + surface displacement meter. The buried depth requirement of the inclinometer tube is: ≥2m below the sliding surface, and cement mortar (rock) or clay slurry (soil) is used for backfill.
Warning classification mechanism
| Level | Landslide determination standard | Debris flow determination standard |
|---|---|---|
| Yellow warning | Displacement rate ≥5mm/month | Hourly rainfall ≥30mm |
| Orange warning | Displacement rate ≥10mm/month | Source body displacement ≥50mm |
| Red warning | Crack extension ≥20mm/day | Flow velocity in circulation area ≥3m/s |
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