This Code is prepared on the basis of Code for Design on Subgrade o f RaiLway （TB 10001-2005） as per the requirements of National Railway Administration to establish a standard systemfor railway engineering and construction by summing up experience and research results in recent years on earthworks construction and operation of high-speed railway， intercity railway， mixed passenger and freight railway and heavy-haul railway.lt is a comprehensively revised edition to meet the needs for earthworks

1 General Provisions
2 Terms and Symbols
2．1 Terms
2．2 Symbols
3 Basic Requirements
3．1 Elevation of Track Shoulder
3．2 Shape and Width of Earthworks Surface
3．3 Earthworks Stability and Settlement Control Criteria
3．4 Deformation Monitoring and Assessment
3， 5 Design Service Life
4 Design Loads
4．1 General Requirements
4．2 Main Forces
4．3 Additional Forces
4．4 Special Loads
5 Construction Materials
5．1 General Requirements
5．2Fill Materials
5．3 Stone
5．4 Concrete
5．5 Cement Mortar
5．6 Steel
5．7 Geosynthetics
6 Subgrade
6．1 General Requirements
6．2 Structure of Subgrade
6．3 Subgrade of Embankment
6．4 Subgrade of Cutting
6．5 Compaction Criteria of Subgrade
6．6 Subgrade Treatment Measures
7 Embankment
7．1 General Requirements
7．2 Requirements on Fill Material and Filling
7．3 Compaction Criteria
7．4 Slope Shape and Slope Rate
8 Cutting
8��1 General Requirements
8．2 Soil Cutting
8．3 Rock Cutting
9 Transition Section
9．1 GeneraI Requirements
9．2 Transition Section between Earthworks and Abutment
9．3 Transition Section between Earthworks and Transverse Structures
9．4 Transition Section between Embankment and Cutting
9．5 Transition Section between Cutting and Tunnel
10 Ground Treatment
10．1 General Requirements
10．2 Primary Technical Requirements
10．3 Common Measures
11 Retaining Structures
11．1 General Requirements
11．2 Primary Design Principles
11．3 Types and Application Range of Common Retaining Structures
12 Protection of Earthworks
12．1 General Requirements
12．2 Vegetation Protection
12．3 Framework Revetment
12．4 Solid Revetment （Wall）
12．5 Window Revetment （Wall）
12．6 Anchored Frame Beam
12．7 Shotcrete （Mortar Spraying）
12．8 Gabion Protection
12．9 Protective Mesh
12．10 Geosynthetics
12．11 Protection of Earthworks in Windy， Sandy and Snowy Regions
12．12 Thermal Insulation of Earthworks
13 Waterproofing and Drainage of Earthworks
13．1 General Requirements
13．2 Surface Water
13．3 Groundwater
14 Earthworks in Upgrading of Existing Line and Construction of Second Line
14．1 General Requirements
14．2 Earthworks of Upgrading Existing Railway Line
14．3 Earthworks in Construction of Second Line
14．4 Upgrading9Reinforcement and Utilization of Existing Works
15 Borrow （Disposal） Area and Cut-fill Balance
15．1 General Requirements
15．2 Borrow Area
15．3 Disposal Area （Pile）
15．4 Reclamation and Protection of Borrow （Disposal） Area
15．5 Cut-fill Balance
16 Interface Design of Earthworks
16．1 General Requirements
16．2 Safety Protection Facilities
16．3 Cable Trough
16．4 Others
Appendix A Classification of Common Groups of Fill Materials
Appendix B Design and Test Requirements for Improved Soil
B．1 General Requirements
B．2 Survey and Test on Fill Materials
B．3 Technical Indices of Design for Improved Soil
B．4 Design of Improved Soil
Appendix C Type of Steel and Grade and Strength of Concrete
Appendix D Applicable Conditions of Common Ground Treatment Methods and Measures
Appendix E Greening Protection of Earthworks Slope
Appendix F Design Chart for Waterproof and Drainage of Earthworks
Words Used for Different Degrees of Strictness