1 General Provisions
1.0.1 In order to carry out national technical and economic policies in the construction engineering in expansive soil regions and to realize safety and quality, technical advancement, economic feasibility and protection environment, this code is formulated.
1.0.2 This code is applicable to the geotechnical investigation, design, construction and maintenance management of construction engineering in expansive soil regions.
1.0.3 As for engineering construction in expansive soil regions, control measures shall be adjusted to local conditions according to characteristic of expansive soil, engineering requirement, geographic and geomorphic conditions, climate feature and moisture changes in soil by adopting local experiences.
1.0.4 As for geotechnical investigation, design, construction and maintenance management of construction engineering in expansive soil regions, they shall meet not only the requirements specified in this code, but also those specified in relevant current national standards.
2 Terms and Symbols
2.1 Terms
2.1.1 Expansive soil
Cohesive soil with such deformation characteristics as significant absorption expansion and dehydration shrinkage, in which the sticky particle composition is mainly composed of hydrophilic minerals.
2.1.2 Free swelling ratio
Ratio of increased volume to initial volume of manual prepared baking loose soil sample after steady swelling in the water.
2.1.3 Swelling potentiality
Value of swelling-shrinkage deformation and swelling force possibly generated in the condition where expansive soil changes in environmental conditions.
2.1.4 Swelling ratio
Ratio of increased height to initial height of cutting ring soil sample in consolidometer with steady swelling in the water at certain pressure.
2.1.5 Swelling force
Maximum internal stress generated by swelling of cutting ring soil sample immersed in water with volume unchanged in consolidometer.
2.1.6 Value of swelling deformation
Value of expansive soil deformation with steady swelling in water at certain pressure.
2.1.7 Linear shrinkage ratio
Ratio of decreased height to initial height of cutting ring soil sample with natural moisture after being baked or air dried.
2.1.8 Coefficient of shrinkage
Vertical linear shrinkage ratio of cutting ring soil sample along with the decrease of 1% of water content in linear shrinkage stage.
2.1.9 Value of shrinkage deformation
Value of expansive soil deformation with steady shrinkage due to water loss.
2.1.10 Value of swelling-shrinkage deformation
Total deformation of expansive soil with steady swelling due to water absorption and shrinkage due to water loss.
2.1.11 Grade of swelling-shrinkage
Subgrade evaluation index for influence degree on low rise building caused by swelling-shrinkage deformation of expansive soil subgrade.
2.1.12 Climate influenced layer
Effective depth of subsoil swelling-shrinkage deformation caused by such factors as rainfall, evaporation and temperature under the influence of natural climate.
2.1.13 Climate influenced markedly layer
Depth remarkably influenced by climate.
2.2 Symbols
1 General Provisions
2 Terms and Symbols
2.1 Terms
2.2 Symbols
3 Basic Requirement
4 Geotechnical Investigation
4.1 General Requirements
4.2 Engineering Property Index of Rock-soil
4.3 Site and Subgrade Evaluation
5 Design
5.1 General Requirement
5.2 Subgrade Calculation
5.3 Site Selection and Site Planning
5.4 Slope Land and Retaining Structure
5.5 Architecture Measures
5.6 Structure Measures
5.7 Subgrade and Foundation Measures
5.8 Pipeline
6 Construction
6.1 General Requirement
6.2 Subgrade and Foundation Construction
6.3 Building Construction
7 Maintenance Management
7.1 General Requirement
7.2 Maintenance and Overhaul
7.3 Improvement of the Damaged Building
Appendix A The Relationship Between the Free Swelling Ratio and the Content of Montmorillonite, Cation Exchange Capacity
Appendix B The Method of Observing the Deformation of a Building
Appendix C Main Points of the In-site Loading Test under Water Immersed
Appendix D Free Swelling Ratio Test
Appendix E Swelling Ratio Test under 50kPa Pressure
Appendix F Swelling Ratio and Swelling Force Tests under Different Pressure
Appendix G The Shrinkage Test
Appendix H The Table of Evaporative Power and Amount of Precipitation in Some Regions of China
Appendix J Ground Construction with Strict Request for Utilization
Explanation of Wording in This Code
List of Quoted Standards
