GB/T 51297-2018 in English
VALIDStandard for investigation and survey of soil and water conservation projects
- Issued on:2018-11-01
- Implemented on:2019-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$1,397.00
Introduction
Analysis of the core content of the standard
1. Background of the standard
According to the 2012 Engineering Construction Standard Revision Plan of the Ministry of Housing and Urban-Rural Development (Jianbiao [2012] No. 5), the standard was jointly compiled by the Ministry of Water Resources' Water Resources and Hydropower Planning and Design Institute and 12 other units including the Yangtze River Survey, Planning and Design Institute. The standard integrates international advanced experience and is formed after extensive research and solicitation of opinions.
2. Comparison of technical frameworks
| Chapter | Comprehensive governance project | Production and construction project | Key technical differences |
|---|---|---|---|
| Survey scope | Small watershed as a unit | Control responsibility scope | The latter needs to be coordinated with the main project |
| Measurement accuracy | 1:5000-1:10000 | 1:2000-1:5000 | Higher requirements for production projects |
| Survey depth | Differentiate between large and small silt dams | Special survey for waste dumps above level 4 | Different risk levels |
3. Key points of special engineering survey
Sediment-trapping dam project
Survey focus:It is necessary to identify the weak interlayers and slope faults of the dam foundation and conduct a permeability stability evaluation. In loess areas, collapsibility tests should be added, and the collapsibility level should be determined according to GB50487.
Large silt dam
Measurement requirements: The scale of the reservoir area topographic map shall not be less than 1:2000, the longitudinal section shall be arranged along the dam axis (scale 1:100-1:500), and the cross-section spacing shall be 10-50m.
Implementation suggestions
1. Optimization of the survey stage
- Application of remote sensing technology: It is recommended to combine drone aerial survey in the preliminary design stage to improve the efficiency of collecting dynamic parameters such as the forward speed of the ditch head
- Sample representativeness: The sampling volume of typical small watersheds should account for 10-15% of the total area of the treatment area. The expansion of the ditch bank should be monitored in the black soil area of Northeast China
2. Classification management of waste dumps
According to the suitability classification standard in Appendix C:
- Waste dumps above level 4: Special engineering geological surveying (1:1000-1:2000) must be carried out
- Unstable sites: When there is a forward slope and the rock layer inclination angle is less than the slope angle, the exploration points should be densely spaced to 20m
3. Data quality control
Measurement results must include:
- Instrument calibration certificate (certified by the metrology department)
- Control point adjustment calculation sheet
- Longitudinal and cross-sectional drawings (extension on both sides of the building ≥5m)
Typical problem handling
Case:In the rocky desertification survey in the karst area of Southwest China, it is necessary to focus on the following:
- Vegetation coverage changes in the underground river recharge area
- Development direction and patency of the sinkhole
- Verify the distribution of karst caves using geophysical prospecting combined with drilling
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