Some standard content:
Industry Standard of the People's Republic of China
SL258- 2000
Guidelines on dam safety evaluation
Guidelines on dam safety evaluation2000-12-29
Ministry of Water Resources of the People's Republic of China
Implementation on 2001-03-01
Industry Standard of the People's Republic of China
Guidelines on dam safety evaluation
Guidelines on dam safety evaluationSL2582000
Editing unit: Dam Safety Management Center of Ministry of Water ResourcesApproving department: Ministry of Water Resources of the People's Republic of ChinaEffective date: March 1, 2001
China Water Resources and Hydropower Press
2001Beijing
Ministry of Water Resources of the People's Republic of Chinawww.bzxz.net
Notice on the approval and release of "Guidelines for Safety Evaluation of Reservoir Dams SL258-2000"Shuiguoke [2001] No. 2
All units directly under the Ministry, water resources (water affairs) departments (affiliated) of provinces, autonomous regions, municipalities directly under the Central Government, and municipalities with independent planning status, and Water Resources Bureau of Xinjiang Production and Construction Corps: In accordance with the Ministry's plan for the formulation and revision of water resources and hydropower technical standards, the "Guidelines for Safety Evaluation of Reservoir Dams" formulated by the Construction and Management Department and the Dam Safety Management Center of the Ministry of Water Resources as the main editing unit has been reviewed and approved as a water conservancy industry standard and is hereby promulgated. The name and number of the standard are:
(Guidelines for Safety Evaluation of Reservoir Dams SL258-2000. This standard shall be implemented from March 1, 2001. During the implementation process, please pay attention to summarizing experience. If there are any problems, please inform the supporting department in writing, and they will be responsible for the explanation. The standard text is published and distributed by China Water Resources and Hydropower Press. December 29, 2000
SL258-2000 "Guidelines for Safety Evaluation of Reservoir Dams" is a supporting technical standard for the "Measures for Safety Appraisal of Reservoir Dams" (Water Resources [1995] No. 86). The "Guidelines for Safety Evaluation of Reservoir Dams" mainly include the following contents: 1. Contents, methods and standards (criteria) of flood control standard review, structural safety evaluation, seepage safety evaluation, seismic safety review and metal structure safety evaluation of reservoir dams;
1. Contents related to reservoir dam safety evaluation Contents and requirements of project quality evaluation and dam operation management evaluation:
--How to complete the comprehensive evaluation of dam safety based on the above review and evaluation.
Interpretation unit of this guideline: Construction and Management Department of the Ministry of Water Resources Compilation unit of this guideline: Dam Safety Management Center of the Ministry of Water Resources Main drafters of this guideline: Wang Renzhong Li Junchun Liu Jiashuo Jiang Yongsheng Jinbao
Project quality evaluation
Dam operation management evaluation
Flood control standard review
Structural safety evaluation
Seepage safety evaluation:
Seismic safety review
8Metal structure safety evaluation:
9Comprehensive evaluation of dam safety
Appendix A Cited Standards
Appendix B Comprehensive Evaluation of Dam Safety
Explanation of Articles
1 General Provisions
1.0.1 In order to do a good job in dam safety appraisal, standardize the content, methods and standards (criteria) of its technical work, and ensure the quality of dam safety appraisal: This guideline is formulated in accordance with the "Reservoir Dam Safety Appraisal Measures" (Water Conservancy Bureau No. 1995186) (hereinafter referred to as the "Measures"). 1.0.2 This guideline is applicable to Class 1, 2, and 3 dams (hereinafter referred to as dams) of large, medium and particularly important small reservoirs. Dams include permanent water retaining structures and water discharge, water transfer and ship passing structures and metal structures related to dam safety. Dams below Class 4 of general small reservoirs can refer to this guideline. 1.0.3 This guideline stipulates the requirements and methods for review or evaluation of flood control standards, structural safety, seepage safety, earthquake safety, metal structure safety, engineering quality and operation management in dam safety appraisal. On-site safety inspections in safety appraisal can be carried out in accordance with relevant specifications.
1.0.4 Dam safety evaluation should review the level of the building. According to the current relevant national specifications: review and evaluate the working conditions, loads and operating conditions of the reservoir dam from the beginning. The quality of the dam building should be found out, and the selected calculation parameters should be able to represent the current characteristics of the dam. Large and important medium-sized reservoir dams can be obtained through testing when necessary. 1.0.5 The safety evaluation of reservoir dams requires a comprehensive evaluation with emphasis on key points. For reservoir dams with safety monitoring data, the monitoring data should be analyzed to understand the dam characteristics. 1.0.6 The items listed in Article 1.0.3 should be reviewed or evaluated in accordance with the provisions and requirements of this guideline, and a special report should be compiled. Then, the general report on dam safety appraisal should be compiled by combining the special reports. The information and data used in the review or analysis should be accurate and reliable, and the conclusions should be clear and reasonable.
1.0.7 The dam should be classified according to the standards for reservoir dam safety classification in Article 16 of the Measures and the methods in Chapter 9 of this guideline. 1.0.8 In addition to complying with this guideline, the safety evaluation of reservoir dams should also comply with the provisions of relevant national laws and technical standards (see Appendix A for details). 1
2 Engineering quality evaluation
2.1 General provisions
2.1.1 The purpose and tasks of engineering quality evaluation are: 1 Evaluate engineering geological and hydrogeological conditions; 2 Review whether the actual construction quality of the project (including foundation treatment, structural form and materials, etc.) meets the requirements of current national standards; 3 Check the actual situation and changes in quality since the project was put into use, and whether it can ensure the safe operation of the project;
4 Provide parameters that meet the actual engineering situation for the review or evaluation of dam safety appraisal;
5 Provide guiding opinions for dam risk removal and reinforcement. The basic information required for project quality evaluation includes: 2.1.2
Engineering geological and hydrogeological data;
2 Drawings and literary reports on the design, construction, supervision and acceptance of foundation (including slope) excavation, foundation treatment and other projects; 3 Information on quality control, quality inspection (inspection), supervision and acceptance reports of building construction;
4 Information on quality accidents that occurred during the construction and operation periods of the project and their handling;
5 Information on previous quality inspections and parameter tests after completion. 2.1.3 The basic methods for evaluating project quality are: 1. On-site inspection method: through visual inspection or supplemented by simple measurement and testing: review whether the building's shape, size, external quality and operation status have met the requirements and functions of the original design:
2 Historical data analysis method: for large and medium-sized reservoirs with data, it is mainly through the quality control, quality inspection (inspection), supervision and acceptance report files during the construction period of the project 2
data for review and statistical analysis: for reservoirs lacking data, it is necessary to hold discussions with the original design and construction personnel to collect data, and compare with relevant specifications to evaluate the construction quality of the project;
3 Exploration and test inspection method: when the above two methods cannot evaluate the quality of the project, or when the project has been put into use for more than 6 to 10 years or abnormalities occur during operation, additional exploration, testing or in-situ testing and inspection of the building or dam foundation rock layer can be carried out as needed to obtain the original parameters and conduct evaluation accordingly. 2.2 Quality evaluation of dam foundation and bank slope treatment
2.2.1 The quality evaluation of dam foundation and bank slope treatment should first adopt the historical data analysis method, and then conduct additional exploration and testing when necessary. 2.2.2 The construction quality of the following items of the reservoir dam should be reviewed to see whether it meets the technical requirements of the design and construction of the project and complies with the provisions of SL47-94 "Technical Specifications for Excavation of Rock Foundations of Hydraulic Structures", SDJ249-90 "Quality Grade Assessment Standards for Unit Projects of Water Conservancy and Hydropower Capital Construction Projects", SDJ218-84 "Design Specifications and Modification and Supplementary Provisions for Roller Compacted Earth-Rock Dams", SDJ21-78 "Design Specifications for Concrete Gravity Dams", and SD145-85 "Design Specifications for Concrete Arch Dams": 1. Cleaning of dam foundation and bank slope;
Excavation of anti-seepage body foundation and bank slope;
3. Seepage prevention, consolidation and treatment of geological structures of dam foundation and bank slope; 4. Treatment of special geological problems of dam foundation and bank slope, such as weak layers, karst, springs, etc. When grouting is used for dam foundation and bank slope, it is also necessary to check whether it meets the provisions of SL6294 "Technical Specifications for Cement Grouting Construction of Hydraulic Structures". 2.2.3 When it is found that the construction quality does not meet the requirements of the specifications or there are major quality risks, special demonstration should be carried out in combination with the actual situation of the project to determine whether additional exploration tests and treatment measures are needed.
2.3 Quality evaluation of earth-rock dam projects
2.3.1 In addition to strictly implementing 2.In addition to the above, the following aspects should be reviewed to see whether the filling quality meets the technical requirements of engineering design and construction, and 3
complies with the relevant provisions of the specifications SDI213-83 "Technical Specifications for Roller Compacted Earth-Rock Dam Construction", (SDI21884), SL228-98 "Specifications for the Design of Concrete Face Rockfill Dams": 1. Selection, mining and transportation of dam materials;
2. Filling methods and compaction standards, treatment and quality of joints; 3. Construction quality of soil or concrete impermeable bodies, cushion layers, filter layers, filter layers, drainage facilities and slope protection;
4. Connection between the rock dam and adjacent concrete and masonry bodies and their construction quality; 5. Reasonable burial and protection of safety monitoring equipment; 6. Construction quality control and quality inspection.
The review focuses on the compacted dry density and relative density qualification rate of the filling, as well as the strength, deformation and anti-seepage and drainage performance of the filling to meet the requirements of the specifications, whether the impermeable body and filter drainage body are reliable, and whether the dam slope is stable. 2.3.2 If there is a lack of basic data required for quality evaluation, or if the filling quality of the dam does not meet the requirements or there are quality risks after review, necessary exploration and testing should be supplemented in combination with the operating conditions of the project.
2.3.3 If obvious uneven settlement, cracks, sliding, diffuse infiltration or concentrated leakage are found in the dam body, additional exploration and testing should be carried out according to the specific situation, and further demonstration should be carried out in combination with deformation analysis, stability analysis and seepage analysis of the dam. 2.4 Concrete dam project quality evaluation
2.4.1 In addition to strictly implementing Section 2.2, the evaluation of the quality of concrete dam projects should also review the following aspects to see whether the actual construction quality has met the technical requirements of project design and construction, and complies with the relevant provisions of SDJ21-78, SD145-85, SDJ207-82 "Hydraulic Concrete Construction Specifications", GBJ204-83 "Construction and Acceptance Specifications for Reinforced Concrete Projects" and GBJ107-87 "Concrete Strength Inspection and Evaluation Standards": 1. The quality of raw materials such as cement, sand and gravel (aggregates), steel bars, admixtures and admixtures;
2. The quality of concrete mixing and its pouring into the warehouse; 3. The quality of concrete curing (after solidification) and its joint treatment. The review focuses on whether the actual strength, impermeability, frost resistance grade (grade), impact resistance, abrasion resistance, corrosion resistance, and deformation modulus of concrete meet the specified requirements. All admixtures used must also comply with the relevant provisions of SD108-83 "Technical Standards for Hydraulic Concrete Admixtures" and GB8076-1997 "Concrete Admixtures". 2.4.2 The comprehensive evaluation of project quality focuses on the overall durability of the dam concrete structure and the reliability of the foundation treatment. The cracks, erosion, leakage and other problems that have been found need to be investigated and tested, and their impact on the stability, durability and overall safety of the dam needs to be analyzed.
2.4.3 When there is a lack of basic information required for quality evaluation, or when the actual construction quality of the dam does not meet the requirements or there are quality concessions after review, the dam should be physically inspected or drilled and tested in combination with the operating conditions of the project to further demonstrate the quality of the concrete.
2.4.4 The quality evaluation of special concretes such as roller compacted concrete, flowed concrete, underwater concrete, grouting concrete, shotcrete and asphalt concrete should be carried out in accordance with the requirements of special regulations and specifications. For example, the construction of rolled concrete shall comply with the provisions of SL53-94 "Specifications for Construction of Hydraulic Rolled Concrete", and its quality inspection shall be carried out in accordance with SL48-94 "Testing Procedures for Hydraulic Rolled Concrete".
2.5 Evaluation of the Engineering Quality of Other Buildings
2.5.1 Other buildings include water transmission and discharge buildings and their metal structures that affect the safety of the dam.
2.5.2 The engineering quality evaluation of water transmission and discharge buildings shall refer to the engineering quality evaluation of concrete dams.
2.5.3 The quality evaluation of the metal structure of water transmission and discharge buildings shall be carried out in accordance with DL/T5018-94 "Specifications for the Manufacture, Installation and Acceptance of Steel Gates for Water Conservancy and Hydropower Projects" and DL/T5019-94 "Specifications for the Manufacture, Installation and Acceptance of Water Conservancy and Hydropower Hoists". 2.6 Comprehensive Evaluation of Engineering Quality
2.6.1 The actual construction quality meets the specified requirements, and no quality problems are exposed during the operation of the project. The project quality can be considered to be excellent. 2.6.2 When most of the actual construction quality meets the specified requirements, or some quality defects have been exposed during the operation of the project, but have not yet affected the safety of the project, the project quality can be considered qualified. 2.6.3 When most of the actual construction quality does not meet the specified requirements, or serious quality problems have been exposed during the operation of the project, affecting the safety of the project, the project quality can be considered unqualified.3. If the actual construction quality does not meet the specified requirements, or serious quality problems have been exposed during the operation of the project, affecting the safety of the project, the project quality can be considered unqualified.3. If the actual construction quality does not meet the specified requirements, or serious quality problems have been exposed during the operation of the project, affecting the safety of the project, the project quality can be considered unqualified.
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