GB 50021-2001(2009) in English

1.0.1 This code is formulated with a view to implement the related national technical-economic policies in the geotechnical investigation activities, to accomplish state-of-the-art technology and economic feasibility, to ensure engineering quality and to improve investment benefit.
1.0.2 This Code is applicable to the geotechnical investigation of the engineering projects excluding hydraulic works, railway, highway, bridge and culverts.
1.0.3 Prior to the engineering and construction of the projects, the geotechnical investigation must be carried out according to the basic construction procedure.
1.0.3 A The geotechnical investigation shall, according to the requirements of each investigation stages of the engineering construction, exactly reflect the engineering geological conditions, and ascertain the adverse geological action and geological disaster. Through meticulous investigation and careful analysis, an investigation report presenting integral information and accurate assessment shall be provided.
1.0.4 For the geotechnical investigation, not only the requirements stipulated in this Code but also those in the current relevant ones of the nation shall be complied with.

Foreword
1 General Provisions
2 Terms and Symbols
3 Investigation Classification and Geotechnical Classification
4 Basic Requirements of Engineering Investigations
4.1 Building Construction and Structures
4.2 Underground Excavation
4.3 Shoreside Engineering
4.4 Road and Overhead Network Engineering
4.5 Waste Disposal Engineering
4.6 Nuclear Power Plant
4.7 Side Slope Engineering
4.8 Foundation Excavation Engineering
4.9 Pile Foundation
4.10 Foundation Treatment
4.11 Load Increasing and Protection for Pre-existing Building
5 Adverse Geological Action and Geological Disaster
5.1 Karst
5.2 Landslide
5.3 Dangerous Rock and Collapse
5.4 Mud-rock Flow
5.5 Worked-out Section
5.6 Land Subsidence
5.7 Seismic Effect of Site and Foundation
5.8 Active Faults
6 Special Rock and Soil
6.1 Collapsible Soil
6.2 Red Clay
6.3 Soft Soil
6.4 Fabricated Soil
6.5 Filling
6.6 Perennial Frost
6.7 Expansion Rock and Soil
6.8 Brine Salting Rock and Soil
6.9 Decayed Rock and Residual Soil
6.10 Pollute Soil
7 Groundwater
7.1 Investigation Requirements of Groundwater
7.2 Mensuration for Hydrogeologic Parameter
7.3 Evaluation for Functions of Ground-Water
8 Engineering Geological Mapping and Survey
9 Exploration and Sampling
9.1 General Requirements
9.2 Drilling
9.3 Costeening, Trenching and Cave Exploration
9.4 Adopting of Geotechnical Samples
9.5 Geophysical Exploration
10 In-situ Measurement
10.1 General Requirements
10.2 Load Test
10.3 Statically Cone Penetration Test
10.4 Circular Cone Dynamic Penetration Test
10.5 Standard Penetration Test
10.6 Vane Shear Test
10.7 Pressurementer Test
10.8 Flat Dilatometer Test
10.9 In-situ Direct Shear Test
10.10 Wave Celerity Testing
10.11 Rock Mass In-Situ Stress Testing
10.12 Testing with Shock Excitation Method
11 Indoor Test
11.1 General Requirements
11.2 Soil Physical Property Test
11.3 Soil Compress Consolidation Test
11.4 Soil Shear Strength Test
11.5 Soil kinetic Property Test
11.6 Rock Test
12 Assessment of Water and Soil Corrosivity
12.1 Sampling and Testing
12.2 Corrosion Evaluation
13 In-situ Inspection and Monitoring
13.1 General Provisions
13.2 Inspection and Monitoring for Foundation of Ground Base
13.3 Monitoring for Bad Geological Action and Geologic Hazard
13.4 Monitoring of Groundwater
14 Geotechnical Engineering Analysis Assessment and Result Report
14.1 General Provisions
14.2 Analyses and Adoption of Rock and Soil Parameter
14.3 Basic Requirements of Outcome Report
Annex A: Rock/soil Classification and Verification
Annex B: Blow Count Correction of Taper Dynamic Sounding
Annex C: Engineering Classification of Debris Flow
Annex D: Primary Distinguishing Method of Swelling Soil
Annex E: Hydrogeologic Parameter Measurement Method
Annex F: technical standards of the soil sampler
Annex G: site environment type
Annex H Explanation of Wording