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GB 50843-2013: Technical code for appraisal and reinforcement of building slope Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB 50843-2013: Technical code for appraisal and reinforcement of building slope---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/GB50843-2013GB 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. NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Technical code for appraisal and reinforcement of building slope Chief development department. Chongqing Urban and Rural Construction Committee Approval department. Ministry of Housing and Urban-Rural Development of the People’s Republic of China Implementation date. May 1, 2013 2012 Beijing Ministry of Housing and Urban-Rural Development of the People’s Republic of China Table of ContentsForeword... 4 1 General provisions... 8 2 Terms and symbols... 9 3 Basic requirements... 15 4 Geological investigation of slope strengthening engineering... 19 5 Appraisal of slope engineering... 23 6 Slope strengthening engineering calculation... 38 7 Slope engineering strengthening method... 43 8 Slope strengthening engineering... 54 9 Monitoring of slope engineering... 61 10 Construction and quality acceptance of slope strengthening engineering ... 66 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... 821 General provisions1.0.1 This Code is formulated with a view of implementing the national technical and economic policies, and achieving advanced technology, safety reliability, economic rationality, quality assurance and environmental protection in the appraisal and strengthening of existing building slope engineering. 1.0.2 This Code is applicable to the appraisal and strengthening of existing building slope engineering and rock excavation slope, with a rock slope height of 30m and below and a soil slope height of 15m and below. The slope strengthening engineering exceeding the above heights and that with complex geological and environmental conditions shall, in addition to the conformity with this Code, be specially designed. In addition, effective and reliable measures for strengthening shall be taken accordingly. 1.0.3 Not only the requirements stipulated in this Code, but also those stipulated in the corresponding current national professional standards shall be complied with, during the appraisal and strengthening of building slope engineering in soft soil, collapsible loess, frozen soil, expansive soil and other special geotechnical and erosive environments, and post-disaster building slope engineering in seismic areas. 1.0.4 Not only the requirements stipulated in this Code, but also those stipulated in the corresponding current national standards shall be complied with, during the appraisal and strengthening of existing building slope engineering.2 Terms and symbols2.1 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. 2.1.7 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. 2.1.10 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. 2.2 Symbols 2.2.5 Appraisal As, Bs, Cs - Normal usability grade of the sub-systems; Ass, Bss, Css - Normal usability grade of the appraisal units; Asu, Bsu, Csu, Dsu - Safety grade of the appraisal units; Au, Bu, Cu, Du - Safety grade of the sub-systems; as, bs, cs - Normal usability grade of the members; au, bu, cu, du - Safety grade of the members.3 Basic requirements3.1 General requirements 3.1.1 The design of the strengthening of existing building slope engineering shall adopt the method of information design, and shall meet the relevant requirements of the current national standard GB 50330 Technical code for building slope engineering. 3.2 Appraisal of slope engineering 3.2.1 The appraisal of slope engineering is applicable to the appraisal on safety, normal usability, durability and construction quality of the building slope engineering. 3.3 Slope engineering strengthening design 3.3.1 The slope engineering in the following cases shall be conducted with strengthening design. 3.3.2 During the design of slope strengthening engineering, the following information shall be obtained.4 Geological investigation of slope strengthening engineering4.1 General requirements 4.1.1 Before strengthening, the existing building slope engineering shall be conducted with geological investigation of slope strengthening engineering. 4.1.4 The existing slope strengthening engineering may be directly conducted with detailed stages of investigation. 4.1.5 The geological investigation report of the slope strengthening engineering shall include the following contents. 4.2 Geological investigation of slope 4.2.2 In addition to be consistent with the relevant requirements of current national standards GB 50021 Code for investigation of geotechnical engineering and GB 50330 Technical code for building slope engineering, the geological investigation of slope strengthening engineering shall still focus on ascertaining the following contents. 4.2.3 The investigation methods and layout of the slope strengthening engineering shall meet the following requirements. according to the investigation grade of slope engineering and the signs of deformation 4.3 Stability assessment of slope 4.3.1 On the basis of fully identifying the engineering geological conditions, the slope strengthening engineering shall be conducted with the stability assessment according to the rock-soil type and possible failure modes of the slope as well as the characteristics and functions of the retaining structures. 4.4.5 The effective resistance of the original retaining structure and the geotechnical physico-mechanical indices provided by the appraisal report of slope engineering shall be reasonably utilized.5 Appraisal of slope engineering5.1 General requirements 5.1.1 Before strengthening, the existing building slope engineering shall be conducted with slope engineering appraisal. 5.1.3 The normal usability appraisal of slope engineering may be carried out in the following cases. 5.2 Procedures and contents of appraisal 5.2.1 The appraisal of slope engineering may be carried out according to the procedures in Figure 5.2.1. 5.2.2 The initial investigation should include the following work contents. 5.2.4 Detailed investigation and inspection should select the following work contents according to the actual needs. 5.3 Investigation and inspection 5.3.1 The investigation and inspection of the working conditions shall include three parts, namely actions, service environments and use history of slope engineering. During investigation, the possible changes in working conditions within the target working life shall be taken into consideration. 5.5.8 The slope engineering, constructed by using the slope ratio method, shall be divided into several appraisal units according to the geological characteristics, height and serviced life of slope engineering, so as to investigate the degree of weathering of exposed rock-soil mass as well as the cracks and damage degree of local mass materials in each appraisal unit. 5.6 Sub-system appraisal 5.6.1 The safety appraisal of retaining structure subgrade and foundation shall meet the requirements of Annex B in this Code. 5.7 Appraisal of appraisal unit 5.7.1 The stability appraisal of the appraisal units shall meet the requirements of Annex C in this Code. 5.7.3 The usability appraisal of the appraisal units shall meet the following requirements.6 Slope strengthening engineering calculation6.1 General requirements 6.1.1 The calculation of existing slope strengthening engineering shall meet the relevant requirements of current national standard GB 50330 Technical code for building slope engineering, 6.2 Calculation principle 6.2.1 The calculation of slope strengthening engineering shall meet the following requirements. 6.2.3 During strengthening design of slope engineering, the effective resistance of original retaining structure or member may be calculated based on the geometric dimensions and material properties of original retaining structure member and according to the relevant requirements of current national standards GB 50330 Technical code for building slope engineering and GB 50010 Code for design of concrete structures. 6.2.5 When the force transferring path is changed or the mass of the retaining structure is increased after strengthening of slope engineering, the relevant retaining structures, members and subgrade foundation shall be checked as necessary. 6.3 Parameters for calculation 6.3.1 During strengthening by using the anchoring method, the resistance coefficient of exertion of new anchor and force transferring structure, ζL, should be adopted based on the retaining mode of slope engineering and safety grade of appraisal units, in accordance with Table 6.3.1. 6.3.3 During strengthening by structure member strengthening with R.C, the bearing capacity calculation of the strengthened slope retaining structure member and the values of relevant parameters shall meet the relevant requirements of current national standards GB 50367 Code for design of strengthening concrete structure and GB 50702 Code for design of strengthening masonry structures.7 Slope engineering strengthening method7.1 General requirements 7.1.1 The strengthening methods of existing building slope engineering may be divided into cut unloading at top of slope, back loading at toe of slope, anchoring method, slide-resistant pile method, structure member strengthening with R.C, grouting method, cut-off and draining method, etc. Other locally mature, reliable and effective strengthening methods may also be available. 7.2 Cut unloading at top of slope 7.2.1 The cut unloading at top of slope is mainly used for the strengthening when the overall stability of the slope and the stability of the retaining structures do not meet the requirements. 7.2.4 The slope formed after cut unloading at top of slope may be treated by the slope ratio method, retaining and slope protection, and shall meet the following requirements. 7.3 Back loading at toe of slope 7.4 Anchoring method 7.4.1 The anchoring method is applicable to the strengthening when the overall stability of the slope with anchorage conditions and the bearing capacity of the anti-sliding, anti-overturning retaining structures and members do not meet the requirements. 7.4.5 The anchors in the anchoring method shall meet the following requirements. 7.8 Cut-off and draining method 7.8.1 When deformation and instability of slope engineering are directly related to slope ponding, the cut-off and draining method should be used for strengthening of slope engineering.8 Slope strengthening engineering8.1 General requirements 8.1.1 The selection of the strengthening schemes for existing slope engineering should consider the following factors. 8.1.2 According to the failure mode, causes, construction safety and feasibility of slope engineering as well as the field conditions, the strengthening of slope engineering may be combined by one or more strengthening methods. 8.2 Anchor retaining wall strengthening 8.2.1 One or more of the following methods may be used for anchor retaining wall strengthening. 8.2.3 The use of slide-resistant pile method shall meet the following requirements. 8.3.4 The use of slide-resistant pile method shall meet the following requirements. 8.4 Pile retaining wall strengthening 8.7.3 Other strengthening requirements of the retaining structure subgrade and foundation shall meet the relevant requirements of current industry standard JGJ 123 Technical code for improvement of soil and foundation of existing buildings.9 Monitoring of slope engineering9.1 General requirements 9.1.1 When the slope strengthening construction may cause greater deformation or damage to the protected objects, the strengthened slope and the projected objects shall be monitored. 9.1.6 Slope monitoring shall be undertaken by two or more monitoring personnel. When the measurement accuracy of the monitoring instrument is related to the monitoring personnel, the monitoring personnel shall be fixed. 9.2 Monitoring 9.2.1 The monitoring scheme shall include the monitoring purposes, monitoring items, method and accuracy requirements, measuring point layout, alarm values for monitoring items, information feedback system, site original state records, etc. 9.2.9 The stress monitoring of the retaining structure members shall meet the following requirements. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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