GB 55003-2021 PDF English
US$500.00 · In stock · Download in 9 secondsGB 55003-2021: Code for design of building foundation Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
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GB 55003-2021: Code for design of building foundation---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB55003-2021
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
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
2.1.4 The design service life of the foundation shall meet the following
requirements.
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.
2.2 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
normal use.
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.
3.2 Specific requirements
3.2.1 When there are special rocks and soils on the site and foundation, the
geotechnical engineering survey results shall not only meet the requirements
of clause 3.1 of this Code, but also include the following contents.
3.2.2 When there are unfavorable geological effects and geological disasters in
the proposed site and its vicinity, the geotechnical engineering survey results
shall not only meet the requirements of clause 3.1 of this Code, but also include
the following contents.
4 Natural foundation and treated foundation
4.1 General provisions
4.1.1 The foundation design shall meet the following requirements.
4.1.2 After excavation of the foundation trench (pit) to the design elevation, it
shall carry out the inspection of foundation trench (pit).
4.2 Foundation design
4.2.1 When the axial load actions, the pressure on the bottom surface of the
foundation shall meet the requirements of the following formula.
4.2.2 When the eccentric load actions, the pressure on the bottom surface of
the foundation shall not only meet the requirements of formula (4.2.1), but also
meet the requirements of the following formula.
4.2.3 The characteristic value of the bearing capacity of the natural foundation
shall be comprehensively determined, through load tests or other in-situ tests,
formula calculations, combined with engineering practical experience.
4.3 Special rock foundation design
4.3.1 The buried depth of the foundation of the building (structure), in the
expansive soil area, shall not be less than 1 m. The action of horizontal
expansion force shall be considered, when checking the stability of expansive
soil foundation. Buildings (structures), in expansive soil areas, shall adopt
foundation measures, construction measures, structural measures, to prevent
expansion and contraction deformation.
4.4 Construction and acceptance
4.4.1 Before foundation construction, it shall prepare the foundation
engineering construction program or foundation engineering construction plan,
which shall include. foundation construction technical parameters, foundation
construction process, foundation construction methods, technical measures of
foundation construction safety, emergency plans, engineering monitoring
requirements, etc.
5 Pile foundation
5.1 General provisions
5.1.1 The design calculation or check calculation of the pile foundation shall
include the following contents.
5.1.2 The materials used for the pile foundation, the connection between the
pile segments, the pile foundation structure shall meet the durability
requirements, in the environment category of the site, where it is located.
5.1.3 Engineering piles shall be inspected for bearing capacity and pile quality.
5.2 Design of pile foundation
5.3 Pile foundation design for special rock and soil
5.3.1 For the pile foundation in the site of self-weight collapsible loess, the pile
end shall penetrate the collapsible loess layer, OR it shall take measures to
eliminate the influence of the collapsibility of the soil layer on the pile foundation.
5.3.2 When soil squeezing piles or partial soil squeezing piles are used, in
saturated soft soil foundation, it shall take treatment measures to reduce the
soil squeezing effect.
5.4 Construction and acceptance
5.4.1 The construction of pile foundation engineering shall meet the following
requirements.
5.4.2 The settlement of the following pile foundation projects shall be monitored,
during construction and use, until the settlement reaches a stability criterion.
5.4.3 The construction acceptance inspection of pile foundation engineering
shall meet the following requirements.
6 Foundation
6.1 General provisions
6.1.1 The burial depth of the foundation shall meet the requirements of
foundation's bearing capacity, deformation, stability. For the engineering
structure located on the rock foundation, the burial depth of the foundation shall
meet the requirements of anti-sliding stability.
6.1.2 The concrete foundation shall be subjected to the calculations of punching
shear bearing capacity, shear bearing capacity, bending bearing capacity, local
compressive bearing capacity.
6.2 Design of extended foundation
6.2.1 The calculation of the extended foundation shall meet the following
requirements.
6.2.2 The thickness of the under-column (wall) pile foundation cap shall meet
the requirements for the punching shear of the column (wall) to the cap AND
the punching shear bearing capacity of the pile to the cap.
6.2.3 For the under-column (wall) pile foundation cap, it shall check the shear
bearing capacity of the oblique section of the through cap, which is formed by
the column (wall) side, the variable step position, the line of the pile side,
respectively.
6.2.4 The concrete strength grade of the extended foundation shall not be lower
than C25; the minimum reinforcement ratio of the stressed steel bars shall not
be less than 0.15%. When the reinforced concrete foundation is equipped with
a concrete cushion, the thickness of the concrete protective layer of the
longitudinally stressed steel bars shall be calculated, from the bottom of the
foundation, AND shall not be less than 40 mm.
6.3 Design of raft foundation
6.3.1 The slab thickness of the flat raft foundation shall meet the requirements
of punching shear capacity.
6.4 Construction and acceptance
6.4.1 The construction of foundation work shall meet the following requirements.
6.4.2 The acceptance inspection of foundation engineering shall meet the
following requirements.
7 Foundation pit engineering
7.1 General provisions
7.1.1 The supporting structure of the foundation pit shall be designed, according
to the limit state of the bearing capacity AND the limit state of the normal service.
7.1.2 The calculation of the limit state design of the bearing capacity of the
foundation pit's supporting structure shall include the following.
7.1.3 For foundation pit engineering, which has a safety level of supporting
structure in level I and level II, it shall calculate the deformation of the supporting
structure AND the deformation of the surrounding soil of the foundation pit;
meanwhile, it shall analyze and evaluate the surrounding environmental impact.
7.2 Design of supporting structure
7.2.1 When the supporting structural members are designed according to the
limit state of bearing capacity, they shall conform to the following formula.
7.2.3 The stability check calculation of the foundation pit's supporting structure
shall meet the following requirements.
7.2.4 The pile body concrete's strength grade of the row pile supporting
structure shall not be lower than C25.The thickness of the concrete protective
layer of the longitudinally stressed steel bars of the pile shall not be less than
35 mm; OR it shall not be less than 50 mm, when the underwater pouring
process is used.
7.3 Groundwater control design
7.3.1 The design of groundwater control shall meet the requirements of pit
bottom anti-surge, the requirements for anti-seepage stability check
calculations of pit bottom and side wall, as well as the settlement control
requirements for the municipal facilities such as surrounding buildings
(structures) of the foundation pit, underground pipelines, roads, urban rail
transits.
7.4 Construction and acceptance
7.4.1 Prior to the construction of the foundation pit project, it shall prepare a
special construction plan for the foundation pit project. The content shall include
the construction technical parameters, such as supporting structure,
groundwater control, earth excavation and backfilling; the construction process
of the foundation pit project; the construction methods of foundation pit project;
safety technical measures for foundation pit construction, emergency plans,
engineering monitoring requirements, etc.
8 Slope engineering
8.1 General provisions
8.1.1 The engineering design of the slope shall meet the following requirements.
8.1.2 The overall stability analysis and calculation of the slope engineering
design shall be carried out, according to different working conditions. The
permanent slope retaining structure and components, slope surface drainage
facilities, underground drainage facilities, etc. shall meet the durability
requirements, in the environmental category of the site, where they are located.
8.1.4 During the construction and use of the building (structure), which is
located in the slope collapse area, it shall monitor the slope top displacement,
the surface cracks, the settlement deformation of the building (structure). The
monitoring time, after the completion of the permanent slope project, shall not
be less than 2 years.
8.2 Design of retaining structure
8.2.1 The design calculation or check calculation of the slope retaining structure
shall include the following contents.
8.4 Construction and acceptance
8.4.1 Prior to the construction of the slope project, it shall prepare a special
construction plan for the slope project. Its content shall include the technical
parameters of retaining structure, slope engineering drainage and slope
protection, rock and soil excavation, construction technology process of slope
engineering, construction method of slope engineering, construction safety
technical measures of slope engineering, emergency plan, engineering
monitoring requirements, etc.
8.4.2 The rock and soil excavation of the slope shall meet the following
requirements.
8.4.3 Drainage system shall be set, during the construction of retaining wall's
support. The replace-filled foundation of retaining wall shall be paved and
compacted in layers.
8.4.4 During the construction of the anchor rod (cable), it shall not damage the
retaining structure and components and the foundation of adjacent buildings
(structures).
8.4.5 It shall take anti-seepage measures, for the installation of the slope
drainage hole, interception and drainage ditch, in the construction of spray-
anchor support. After the anchor rod is stretched and locked up to the standard,
the anchor head of the permanent anchor rod shall be sealed AND subject to
anti-corrosive treatment.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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