1 Scope
1.0.1 This standard specifies such contents as the basic principles and methods for the design of subgrade and foundation for wind turbine generator system tower in wind power station, engineering geological conditions, environmental conditions, load, structural design, ground treatment, inspection and monitoring involving subgrade and foundation.
1.0.2 This standard is applicable to the design of subgrade and foundation for wind turbine generator system tower in newly-built onshore wind power station. Completion acceptance, reconstruction (extension) of existing project and periodical safety inspection shall be implemented by reference to this standard.
1.0.3 The design of subgrade and foundation for wind turbine generator system tower in wind power station shall comply with the requirements of this standard, subgrade of collapsible soil, permafrost and expansive soil and that in erosive environment or under temperature influence shall also meet those specified in relevant current national standards.
2 Normative References
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB 18306 Seismic Ground Motion Parameter Zonation Map of China
GB 18451.1 Wind Turbine Generator Systems - Safety Requirements
GB 50007 Code for Design of Building Foundation
GB 50009 Load Code for the Design of Building Structures
GB 50010 Code for Design of Concrete Structures
GB 50011 Code for Seismic Design of Buildings
GB 50021 Code for Investigation of Geotechnical Engineering
GB 50046 Code for Anticorrosion Design of Industrial Constructions
GB 50153 Unified Standard for Reliability Design of Engineering Structures
GB 50223 Standard for Classification of Seismic Protection of Building Constructions
GB 50287 Code for Hydropower Engineering Geological Investigation
GBJ 146 Technique of Powdered Coal Ash Concrete Application
FD 002-2007 Classification and Design Safety Standard of Windpower Projects
DL/T 5082 Design Specifications of Hydraulic Structures against Ice and Freezing Action
JB/T 10300 Wind Turbine Generator System - Design Requirements
JGJ 24 Code for Design of Civil Architecture Thermal Engineering
JGJ 94 Technical Code for Building Pile Foundations
JGJ 106 Technical Code for Testing of Building Foundation Piles
JTJ 275 Corrosion Prevention Technical Specifications for Concrete Structures of Marine Harbor Engineering
3 General Provisions
3.0.1 This standard is specially prepared in order to unify the content and depth of design of subgrade and foundation for wind turbine generator system tower in wind power station.
3.0.2 The subgrade and foundation for wind turbine generator system is designed through implementing national technical and economic policies, insisting principles of adaptation to local conditions, environmental protection and resource conservation, and fully considering the load-bearing characteristics of the structure, so as to be safe and applicable, economical and reasonable and technology-advanced.
3.0.3 Ultimate state design method is adopted for the design of subgrade and foundation in this standard, and the evaluation of load and relevant partial factor shall comply with relevant requirements so as to ensure the safe and normal operation of subgrade and foundation for wind turbine generator system under the specified external conditions, design conditions and load conditions within the 50-year design service life.
Foreword i
1 Scope
2 Normative References
3 General Provisions
4 Terms
5 Basic Requirements
6 Subgrade Properties
6.1 Rock-soil Classification
6.2 Engineering Property Indexes of Rock and Soil Mass
7 Load, Load Condition, Load Effect Combination and Partial Factor
7.1 Load
7.2 Load Condition and Load Effect Combination
7.3 Partial Factor
8 Subgrade Calculation
8.1 General
8.2 Calculation of Subgrade Bearing Capacity
8.3 Compression Calculation of Foundation
8.4 Deformation Calculation
8.5 Stability Calculation
9 Foundation Design
9.1 General
9.2 Spread Foundation
9.3 Pile Foundation
9.4 Rock Foundation with Anchor Bars
9.5 Requirements for Ordinary Construction
10 Ground Treatment
10.1 General Requirements
10.2 Soil-rock Composite Subgrade
10.3 Compacted Fill Subgrade
10.4 Karst and Rock Subgrade
10.5 Soft Subgrade
11 Inspection and Monitoring
11.1 Inspection
11.2 Monitoring
Annex A Classification of Rock Hardness Degree and Rock Mass Integrity Degree
Annex B Classification of Rock Mass Weathered Zone
Annex C Classification of Rock Mass Structure
Annex D Field Identification of Gravelly Soil
Annex E Key Points of Shallow Plate Loading Test
Annex F Standard Value ck and φk of Shear Strength
Annex G Vibration Liquefaction Discrimination of Soils
Annex H China Standard Frost Penetration Line Graph of Seasonally Frozen Soil
Appendix J Additional Stress Factor α and Average Additional Stress Factor
Annex K Tables for Empirical Values of Ultimate Shaft Resistance and Ultimate Tip Resistance for Pile
Annex L Calculation of Pile Foundation under Horizontal Load Considering Cooperative Action of Pile Cap and Foundation Pile and Elastic Resistance Action of Soil
Appendix M Calculation of Final Settlement Value of Pile Foundation
Explanation of Provisions
