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GB 55003-2021: Code for design of buiding foundation
GB 55003-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 55003-2021
General code for building and municipal foundations
ISSUED ON: APRIL 09, 2021
IMPLEMENTED ON: JANUARY 01, 2022
Issued by: Ministry of Housing and Urban-Rural Development of PRC;
State Administration for Market Regulation.
Table of Contents
Foreword ... 4 
1 General ... 7 
2 Basic provisions ... 8 
2.1 Basic requirements... 8 
2.2 Design ... 9 
2.3 Construction and acceptance ... 12 
3 Requirements for survey results ... 14 
3.1 General requirements... 14 
3.2 Specific requirements ... 14 
4 Natural foundation and treated foundation ... 17 
4.1 General provisions ... 17 
4.2 Foundation design ... 17 
4.3 Special rock foundation design ... 18 
4.4 Construction and acceptance ... 19 
5 Pile foundation ... 22 
5.1 General provisions ... 22 
5.2 Design of pile foundation ... 22 
5.3 Pile foundation design for special rock and soil ... 25 
5.4 Construction and acceptance ... 26 
6 Foundation ... 28 
6.1 General provisions ... 28 
6.2 Design of extended foundation ... 28 
6.3 Design of raft foundation ... 29 
6.4 Construction and acceptance ... 30 
7 Foundation pit engineering ... 32 
7.1 General provisions ... 32 
7.2 Design of supporting structure ... 32 
7.3 Groundwater control design ... 34 
7.4 Construction and acceptance ... 35 
8 Slope engineering ... 39 
8.1 General provisions ... 39 
8.2 Design of retaining structure ... 40 
8.3 Slope engineering drainage and slope protection design ... 41 
8.4 Construction and acceptance ... 41 
General code for building and municipal foundations
1 General
1.0.1 In order to implement the building policy in the construction of foundation
projects, ensure the safety of foundations and superstructures, meet the needs
of normal use of construction projects, protect the ecological environment,
promote green development, this Code is hereby formulated.
1.0.2 This Code must be implemented for foundation engineering.
1.0.3 Whether the technical methods and measures, which are adopted in the
engineering construction, meet the requirements of this Code, shall be
determined by the relevant responsible entities. Among them, innovative
technical methods and measures shall be demonstrated AND meet the relevant
performance requirements in this Code.
2 Basic provisions
2.1 Basic requirements
2.1.1 The foundation shall meet the following functional requirements:
1 The foundation shall have the bearing capacity and stiffness, to transfer
the superstructure load to the foundation;
2 Under the various functions and combinations of the superstructure, the
foundation shall not be unstable
3 The settlement and deformation of the foundation shall not affect the
function and normal use of the superstructure;
4 Has sufficient durability;
5 The foundation pit project shall ensure the safety and normal use of the
supporting structure, surrounding buildings (structures), underground
pipelines, roads, urban rail transit and other municipal facilities. It shall
ensure the construction space and safety of the main underground
structure;
6 The slope engineering shall ensure the safe and normal use of supporting
structures, surrounding buildings (structures), roads, bridges, municipal
pipelines and other municipal facilities.
2.1.2 Geotechnical engineering survey shall be carried out, before the design
of foundation engineering. The results of geotechnical engineering survey shall
meet the requirements of foundation design, construction and acceptance.
2.1.3 The foundation design shall select a reasonable plan, according to the
structure type, action and combination of actions, survey results, environmental
conditions and construction conditions of the proposed site. The design
calculation shall have correct principles and clear concepts. The selection of
calculation parameters shall conform to the actual working conditions. The
design and calculation results shall be true and reliable. The analysis and
judgment shall be correct.
2.1.4 The design service life of the foundation shall meet the following
requirements:
1 The design service life of the base and foundation shall not be less than
the design service life of the superstructure;
2 For the engineering design of the foundation pit, it shall specify the service
life; the design service life shall not be less than 1 year;
3 The design service life of the slope project shall not be less than the design
service life of the protected buildings (structures), roads, bridges,
municipal pipelines and other municipal facilities.
2.1.5 Within the design service life of base and foundation, the foundation
engineering materials, components, geotechnical properties shall meet the
requirements of safety, applicability, durability.
2.1.6 The construction of foundation works shall adopt materials, components,
equipment, that have passed quality inspections. The construction plan shall be
formulated, according to the design requirements and engineering needs. The
construction quality control and engineering monitoring shall be carried out.
Engineering monitoring shall ensure the integrity, authenticity, reliability of the
data.
2.1.7 Measures shall be taken, to control vibration, noise, dust, waste water,
waste, toxic and hazardous substances, to prevent their hazards to the
engineering site, surrounding environment, human health, in the construction
of foundation engineering.
2.1.8 When the groundwater level changes adversely affect the safety of the
construction project and the surrounding environment, it shall take safe and
effective disposal measures.
2.1.9 For the groundwater control projects, it shall take measures to prevent the
deterioration of groundwater quality. It shall not cause the mixing of
groundwater of different water quality categories. It shall neither endanger the
safety of surrounding buildings (structures), underground pipelines, roads,
urban rail transit and other municipal facilities, nor affect its normal use.
2.1.10 For construction sites with special rock and soil, adverse geological
effects and geological disasters, it shall ascertain the situation, analyze its
impact on the ecological environment and the proposed project, propose
countermeasures, evaluate the effectiveness of countermeasures.
2.2 Design
2.2.1 Foundation engineering shall be designed, according to the design
service life, the environmental category of the proposed site, the overall geology
of the site and the survey results, the action and action combination of the
foundation. It shall propose the construction and acceptance requirements,
engineering monitoring requirements, maintenance requirements during
3 Requirements for survey results
3.1 General requirements
3.1.1 The geotechnical survey results of the proposed site shall include the
following contents:
1 The topography, geomorphology, geological structure conditions of the
proposed site; the classification and distribution of the foundation rock and
soil;
2 Physical and mechanical indexes of rock and soil;
3 The buried conditions, types, water levels, changes of groundwater, within
the scope of influence of the foundation;
4 The analysis and judgment of the corrosiveness of the foundation soil and
groundwater, to the foundation and the main building materials of the
foundation;
5 Earthqu...