1.0.1 This code is formulated with a view to achieving safety and usability, environmental protection, energy saving, economy and rationality, quality guarantee and advanced technology in the design and construction of tall building raft foundation and box foundation.
1.0.2 This code is applicable to the design, construction and monitoring of tall building raft foundations and box foundations.
1.0.3 For the design and construction of tall building raft foundations and box foundations, the geological conditions of the whole building site, construction method, construction sequence, service requirements and mutual influence with adjacent buildings shall be comprehensively analyzed.
1.0.4 The design, construction and monitoring of tall building raft foundations and box foundations shall not only comply with the requirements of this code, but also those in the current relevant ones of the nation.
1 General Provisions 1
2 Terms and Symbols 1
2.1 Terms 1
2.2 Symbols 1
3 Basic Requirement 4
4 Subsoil Investigation 5
4.1 General Requirement 5
4.2 Requirements of Exploration 7
4.3 Laboratory and In-situ Tests 9
4.4 Groundwater 9
5 Calculation of Subsoil 11
5.1 General Requirement 11
5.2 Embedded Depth of Foundation 12
5.3 Calculation of Bearing Capacity 12
5.4 Calculation of Deformation 14
5.5 Calculation of Stability 17
6 Requirements of Structural Design and Detail 18
6.1 General Requirement 18
6.2 Raft Foundation 21
6.3 Box Foundation 29
6.4 Piled Raft Foundation and Piled Box Foundation 35
7 Construction 37
7.1 General Requirement 37
7.2 Groundwater Control 39
7.3 Excavation of Foundation Pit 41
7.4 Construction of Raft Foundation and Box Foundation 42
8 Inspection and Monitoring 44
8.1 General Requirement 44
8.2 Construction Inspection 44
8.3 Foundation Excavations Inspection 45
8.4 Monitoring of Building Settlement 45
Appendix A Essentials of Subgrade Coefficient from Load Test 47
Appendix B Additional Stress Coefficient α and Average Additional Stress Coefficient 49
Appendix C Coefficient δ for Settlement Calculation Using E0 65
Appendix D Calculation for the Perimeter and Polar Moment of Inertia of the Critical Punching Section 66
Appendix E Coefficient of Subgrade Reaction 69
Appendix F Simplified Calculation Method for Integral Bending Moment of Raft Foundation and Box Foundation 73
Explanation of Wording in this Code 75
List of Quoted Standards 76
