GB 50843-2013 PDF in English
GB 50843-2013 (GB50843-2013) PDF English
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Technical code for appraisal and reinforcement of building slope
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Standards related to (historical): GB 50843-2013
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GB 50843-2013: PDF in English GB 50843-2013
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
UDC
Technical code for appraisal and
reinforcement of building slope
ISSUED ON. DECEMBER 25, 2012
IMPLEMENTED ON. MAY 1, 2013
Jointly issued by. Ministry of Housing and Urban-Rural Development of
the People’s Republic of China;
General Administration of Quality Supervision,
Inspection and Quarantine of the People’s Republic of
China.
Foreword
As per the requirements of Construction Standard [2009] No. 88 issued by the
Ministry of Housing and Urban-Rural Development - Notice on Printing and
Distributing the “Formulation and Amendment Plan for National Standards on
Engineering Construction in 2009”, the code compilation team hereby compiled
this Code through extensive investigation and research, with practical
experience summarized in earnest, by reference to relevant national and
international standards, and on the basis of extensive solicitation.
The technical contents of this Code mainly consist of general provisions, terms
and symbols, basic requirements, geological investigation of slope
strengthening engineering, appraisal of slope engineering, slope strengthening
engineering calculation, slope engineering strengthening method, slope
strengthening engineering, monitoring of slope engineering, construction and
quality acceptance of slope strengthening engineering.
The provision(s) of this Code printed in bold type is (are) mandatory one(s) and
must be enforced strictly.
The Ministry of Housing and Urban-Rural Development is responsible for the
administration of this Code and the interpretation of mandatory provisions. The
Chongqing First Construction Group Co., Ltd is responsible for the
interpretation of specific technical contents.
Any opinions or advice in the process of execution, can be posted or passed
on to the Chongqing First Construction Group Co., Ltd at 1# Office Building,
Guangsha Community, Tanzikou, Jiulongpo District, Chongqing, Zip Code.
400053.
Chief development organizations of this Code.
Chongqing First Construction Group Co., Ltd
Chongqing Architectural Design Institute of China
Participating development organizations of this Code.
China Building Technique Group Co., Ltd
Chongqing Construction Science Research Institute
Central Research Institute of Building and Construction Co., Ltd
Sichuan Institute of Building Research
Table of Contents
Foreword ... 4
1 General provisions ... 8
2 Terms and symbols ... 9
2.1 Terms ... 9
2.2 Symbols ... 11
3 Basic requirements ... 15
3.1 General requirements ... 15
3.2 Appraisal of slope engineering ... 15
3.3 Slope engineering strengthening design ... 16
4 Geological investigation of slope strengthening engineering ... 19
4.1 General requirements ... 19
4.2 Geological investigation of slope ... 19
4.3 Stability assessment of slope ... 20
4.4 Values of parameters ... 22
5 Appraisal of slope engineering ... 23
5.1 General requirements ... 23
5.2 Procedures and contents of appraisal ... 23
5.3 Investigation and inspection ... 28
5.4 Appraisal criteria ... 30
5.5 Appraisal of retaining structure members ... 32
5.6 Sub-system appraisal ... 34
5.7 Appraisal of appraisal unit ... 36
6 Slope strengthening engineering calculation ... 38
6.1 General requirements ... 38
6.2 Calculation principle ... 38
6.3 Parameters for calculation ... 41
7 Slope engineering strengthening method ... 43
7.1 General requirements ... 43
7.2 Cut unloading at top of slope ... 43
7.3 Back loading at toe of slope ... 45
7.4 Anchoring method ... 45
7.5 Slide-resistant pile method ... 47
7.6 Structure member strengthening with R.C ... 48
7.7 Grouting method ... 49
7.8 Cut-off and draining method ... 51
8 Slope strengthening engineering ... 54
8.1 General requirements ... 54
8.2 Anchor retaining wall strengthening ... 55
8.3 Gravity retaining wall, cantilever retaining wall and counterfort retaining wall
strengthening ... 56
8.4 Pile retaining wall strengthening ... 58
8.5 Anchoring and shotcreting for rock slope strengthening ... 59
8.6 Slope ratio method engineering strengthening ... 59
8.7 Subgrade and foundation strengthening ... 60
9 Monitoring of slope engineering ... 61
9.1 General requirements ... 61
9.2 Monitoring ... 61
9.3 Monitoring data processing ... 65
9.4 Monitoring report ... 65
10 Construction and quality acceptance of slope strengthening engineering
... 66
10.1 General requirements ... 66
10.2 Construction design ... 67
10.3 Emergency treatment for construction hazards ... 67
10.4 Quality acceptance ... 68
Annex A Slope stability calculation method with effective resistance of the
original retaining structure ... 70
Annex B Safety appraisal of retaining structure subgrade and foundation ... 75
Annex C Stability appraisal of appraisal unit ... 79
Explanation of wording in this Code ... 81
List of quoted standards ... 82
2 Terms and symbols
2.1 Terms
2.1.1 Building slope
Artificial slopes formed on or near the construction sites or due to excavation or
filling of building engineering and municipal engineering; natural slopes that
affect the safety or stability of buildings, hereinafter referred to as slope in this
Code.
2.1.2 Existing building slope engineering
The whole or part of the completed building slope engineering.
2.1.3 Appraisal of existing building slope engineering
A series of activities such as surveying, inspection, analysis-checking,
assessment, etc. carried out for the safety, normal usability of existing building
slope engineering.
2.1.4 Strengthening of existing building slope engineering
The measures such as strengthening, local replacement, etc. for the existing
building slope engineering and its related parts, taken to meet the safety,
suitability and durability specified in current national standards.
2.1.5 Geological investigation of slope strengthening engineering
Geotechnical investigation activities for existing building slope engineering,
carried out prior to slope appraisal and strengthening.
2.1.6 Design working life for strengthening of existing building slope
engineering
The period where under normal conditions, the existing building slope
engineering, or retaining structure, members may be used in accordance with
their intended purpose after strengthening, with no need to be re-inspected or
re-appraised.
2.1.7 Target working life
Expected years of use of the existing building slope engineering.
2.1.8 Inspection
Checking, surveying, testing and verification activities for the assessment of
construction quality or performance.
2.1.9 Appraisal unit
Sections that may be appraised independently, divided in accordance with
different retaining structure systems, structural features, structural layouts,
slope heights and action sizes of the building slope engineering being
appraised. Each section refers to an appraisal unit.
2.1.10 Sub-system
Basic appraisal unit in the appraisal unit, subdivided in accordance with different
composing forms of the retaining structure.
2.1.11 Member
Basic stress unit that can be further subdivided in the retaining structure.
2.1.12 Anchor
A member that transmits tension to a stable rock-soil layer. In the event that
steel stranded wires or high-strength steel tendons are used as the rod material,
it may also be called anchorage. Unless otherwise specified in this Code,
anchor shall be the collective name of anchor and pre-stressed anchorage.
2.1.13 Cut unloading at top of slope
A strengthening method that fulfills the predetermined function of the
strengthened existing building slope engineering through the decrease in slope
thrust by removing the rock-soil mass in the thrust zone of the building slope.
2.1.14 Back loading at toe of slope
A strengthening method that fulfills the predetermined function of the
strengthened existing building slope engineering through back loading at toe of
slope of the existing building slope engineering.
2.1.15 Slide-resistant pile method
A strengthening method that fulfills the predetermined function of the
strengthened existing building slope engineering by setting slide-resistant piles.
2.1.16 Structure member strengthening with R.C
xgi - x-coordinate of the point of vertical additional load per unit width of the ith
calculation slice;
xni, yni - x-coordinate and y-coordinate of the midpoint on the slip surface of the
ith calculation slice;
yqi - y-coordinate of the point of horizontal load per unit width of the ith calculation
slice;
xri, yri - x-coordinate and y-coordinate of the effective resistance point of the ith
calculation slice;
a, ai - Inclination for the effective resistance per unit width of the landslide mass
and the ith calculation slice;
θ, θi - Inclination of the slip surface and the ith calculation slice.
2.2.4 Calculated coefficients
Fs, Ft - Anti-sliding, anti-overturning stability safety coefficients of the slope;
Fst - Overall stability safety coefficient;
i - Calculation slice number, numbered from the latter ones;
n - Number of slices;
x’i - Relative horizontal distance FROM the vertical interface between the ith
calculation slice and the (i + 1)th calculation slice TO the front of the slip surface,
is the ratio OF the horizontal distance to the front of the slip surface TO the
horizontal distance between the front and back of the slip surface;
γ0 - Importance coefficient of the retaining structure;
ζL - Resistance coefficient of exertion of new retaining structure or member;
ψi - Transfer coefficient of the residual downslide thrust of the ith calculation slice
to the (i + 1)th calculation slice.
2.2.5 Appraisal
As, Bs, Cs - Normal usability grade of the sub-sy...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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