GB/T 50547-2022
Technical standards for geotechnical engineering of tailings accumulation dams (English Version)
- Standard No.
- GB/T 50547-2022
- Language
- Chinese, Available in English version
- Release Date
- 2022
- Published By
- Ministry of Housing and Urban-Rural Development of the People's Replublic of China
- Latest
- GB/T 50547-2022
- Scope
- The "Technical Standards for Geotechnical Engineering of Tailings Heap Dams" is now approved as a national standard, numbered GB/T50547-2022, and will come into force on December 1, 2022. The original national standard "Technical Code for Geotechnical Engineering of Tailings Heap Dam" (GB50547-2010) will be abolished at the same time. This standard is published on the website of the Ministry of Housing and Urban-Rural Development (www.mohurd.gov.cn), and is published by China Planning Publishing House Co., Ltd. organized by the Institute of Standards and Quotas of the Ministry of Housing and Urban-Rural Development. Ministry of Housing and Urban-Rural Development September 8, 2022
- Introduction
Analysis of the core content of the standard
Survey category Applicable scenarios Key technical requirements Survey during operation When the dam height increment reaches 1/3~1/2 of the design value Location of the infiltration line, analysis of the consolidation law of tailings Closure survey When the final stacking height is reached Hazard identification, feasibility assessment of reclamation Special survey Adjustment of mining/monitoring system Process adaptability analysis, optimization of sensor layout
Key Technical Points
1. Seepage calculation and analysis: The effect of the effectiveness of drainage facilities on the infiltration line needs to be considered, and the selection of 2D/3D models depends on the dam grade (Engineering dam is mandatory for 3D analysis). The permeability coefficient needs to be determined through on-site pumping tests and indoor vertical/horizontal permeability tests.
2. Stability evaluation: The simplified Bishop method (safety factor ≥ 1.5) is combined with the strength reduction method. Under earthquake conditions, the 7-degree intensity area needs to be subjected to pseudo-static method and time history analysis, and the parameter selection refers to the CU/CD test results in Table 8.1.5.
Implementation suggestions
- Exploration layout: the spacing between main exploration lines is ≤150m, the proportion of controlled drilling holes is ≥50%, and the potential sliding surface is penetrated
- In-situ testing: static penetration (20mm/s uniform penetration), cross-plate shear (spacing between soft clay layers is 1.0m)
- Hazard control: a combination of filter layer + slope pressure body is used for pipe bursts, and gravel pile reinforcement is preferred in liquefaction areas
GB/T 50547-2022 history
- 2022 GB/T 50547-2022 Technical standards for geotechnical engineering of tailings accumulation dams
- 2010 GB 50547-2010 Technical code for geotechnical engineering of tailings embankment