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(Technical specification for soft soil foundation treatment of hydropower projects)
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NB/T 10343-2019
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Basic data | Standard ID | NB/T 10343-2019 (NB/T10343-2019) | | Description (Translated English) | (Technical specification for soft soil foundation treatment of hydropower projects) | | Sector / Industry | Energy Industry Standard (Recommended) | | Classification of Chinese Standard | P59 | | Classification of International Standard | 27.140 | | Word Count Estimation | 189,131 | | Date of Issue | 2019-12-30 | | Date of Implementation | 2020-07-01 | | Issuing agency(ies) | National Energy Administration | NB/T 10343-2019: (Technical specification for soft soil foundation treatment of hydropower projects)
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Technical Code for Weak Soil Ground Treatment
of Hydropower Projects
Energy Industry Standards of the People's Republic of China
Technical specifications for soft soil foundation treatment in hydropower projects
2019-12-30 released
2020-07-01 implementation
Issued by the National Energy Administration
Foreword
According to the National Energy Administration’s announcement on issuing the first batch of industry standard system (revision) plans in the energy sector in.2014
Knowing” (Guoneng Technology [2014] No. 298), the specification preparation team has conducted extensive investigations and studies, and earnestly summarized the practice
Based on experience, refer to relevant domestic standards, and on the basis of extensive solicitation of opinions, formulate this specification.
The main technical contents of this code are. basic regulations, key points of engineering geological survey, foundation calculation, foundation compaction,
Rammed foundation, pre-compressed foundation, cement fly ash gravel pile composite foundation, soil compaction and lime soil compaction pile composite foundation, sand
Composite foundation of stone compacted pile and sand-gravel replacement pile, composite foundation of cement-soil mixing pile, composite foundation of rigid pile, pile net structure
Composite foundation, high-pressure jet grouting reinforcement, grouting reinforcement, rock dumping to squeeze silt, blasting to squeeze silt.
This specification is managed by the National Energy Administration, proposed by the General Institute of Hydropower and Water Conservancy Planning and Design, and is responsible for daily management.
The Hydropower Survey and Design Standardization Technical Committee of the Energy Industry is responsible for the interpretation of specific technical content. If intentionally during execution
See or suggest, please send to the General Institute of Hydropower and Water Conservancy Planning and Design (Address. No. 2 Kangbei Xiaojie, Liupu, Xicheng District, Beijing, Post
Edit. 100120).
Editor-in-chief of this code. China Power Construction Group East China Survey, Design and Research Institute Co., Ltd.
Participating unit of this specification. China Power Construction Group Zhongnan Survey Design & Research Institute Co., Ltd.
China Water Resources and Hydropower Twelfth Engineering Bureau Co., Ltd.
Zhejiang Huadong Construction Engineering Co., Ltd.
China Power Construction Group Port and Shipping Construction Co., Ltd.
Zhejiang Jiaotong Group Co., Ltd.
South China University of Technology
Southwest Jiaotong University
Zhejiang University
Tianjin Urban Construction University
Guangdong University of Technology
Dacheng Science & Innovation Infrastructure Co., Ltd.
The main drafters of this code. Wang Mingyuan, Shan Zhigang, Zhang Jianjing, Zhou Xiaowen, Luqun Li Zhangming
Xu Xueyong Shen Yiyuan Liu Yongxiang Wang Kuanjun Hu Soldier Zhou Jian
Di Shengjie Ao Renjun Shan Guangyan Liu Yongjian Li Honglin Sun Miaojun
Xu Gaofeng Wei Xiaolan Chen Guohai Liu Hanpeng Shen Zhongtao Xun Caiyun
Xiong Xiao Liu Qiang Zhuang Yingchun Du Wenbo Zhou Lipei
Main reviewers of this code. Wang Huiming, Yan Yongpu, Guo Yihua, Li Wengang, Mi Yingzhong, Deng Yiguo
Shi Qingchun Ninghua Late Xu Xiang Li Zhibiao Chen Shanxiong Yang Shouhua
Tong Xiaodong Yu Jiongqi Zhu Jiancai Zeng Qingjun Liu Weiwei Jiang Yali
Liu Rongli Li Shisheng
Table of contents
1 General...1
2 Terminology...2
3 Basic regulations...4
4 Key points of engineering geological survey...6
5 Foundation calculation...8
5.1 Load calculation...8
5.2 Foundation bearing capacity...8
5.3 Foundation deformation...11
5.4 Foundation stability...12
6 Compacting the foundation...14
6.1 Design...14
6.2 Construction...14
6.3 Inspection and monitoring...15
7 Consolidating the foundation...16
7.1 General provisions...16
7.2 Design...16
7.3 Construction...18
7.4 Inspection and monitoring...18
8 Pre-stressed foundation...20
8.1 General regulations...20
8.2 Design...20
8.3 Construction...25
8.4 Inspection and monitoring...27
9 Composite foundation of cement, fly ash and gravel piles...29
9.1 General regulations...29
9.2 Design...29
9.3 Construction...31
9.4 Inspection and monitoring...32
10 Composite foundation of soil compaction pile and lime-soil compaction pile...34
10.1 General provisions...34
10.2 Design...34
10.3 Construction...36
10.4 Inspection...37
11 Composite foundation of sand-gravel compaction pile and sand-gravel replacement pile...38
11.1 General provisions...38
11.2 Design...38
11.3 Construction...40
11.4 Inspection...41
12 Cement-soil mixing pile composite foundation...43
12.1 General provisions...43
12.2 Design...43
12.3 Construction...44
12.4 Inspection...45
13 Rigid pile composite foundation...46
13.1 General provisions...46
13.2 Design...46
13.3 Construction...46
13.4 Inspection...47
14 Pile-net structure composite foundation...48
14.1 Design...48
14.2 Construction...50
14.3 Inspection and monitoring...51
15 High-pressure jet grouting reinforcement...52
15.1 General provisions...52
15.2 Design...52
15.3 Construction...53
15.4 Inspection...53
16 Grouting reinforcement...55
16.1 General provisions...55
16.2 Design...55
16.3 Construction...57
16.4 Inspection...59
17 Throwing rocks to squeeze silt...61
17.1 Design...61
17.2 Construction...62
17.3 Inspection and Monitoring...62
18 Blasting to squeeze silt...64
18.1 General provisions...64
18.2 Design...64
18.3 Construction...67
18.4 Inspection and monitoring...68
Appendix A Treatment Methods for Weak Soil Foundation...69
Appendix B Evaluation of Soil and Water Corrosion...70
Explanation of terms used in this specification...74
List of Reference Standards...75
Attachment. Article description...76
1 General
1.0.1 This code is formulated to standardize the technical requirements for the design, construction and inspection of soft soil foundation treatment in hydropower projects.
1.0.2 This code is applicable to the treatment of soft ground for hydropower projects.
1.0.3 The soft soil foundation treatment technology of hydropower projects shall not only comply with this code, but also comply with the current relevant national standards
Provisions.
2 term
2.0.1 weak soil ground
Mainly composed of silt, silty soil, alluvial fill, miscellaneous fill, saturated loose silt fine sand or other highly compressible soil layers
Form the foundation.
Synonym. soft foundation.
2.0.2 Characteristic value of subsoil bearing capacity
The pressure value corresponding to the specified deformation value in the linear section of the pressure-deformation curve obtained by the foundation load test, the maximum
The value is the ratio limit value.
2.0.3 compacted ground
Use flat roller, vibratory roller, impact roller or other roller compaction equipment to layer and compact the foundation.
2.0.4 Rammed ground
Use tamping method to reinforce the foundation, that is, repeatedly lift the rammer to a high place to make it fall freely, and impact the foundation
And vibration energy to form a compact foundation or a foundation for replacement piers.
2.0.5 Compaction factor
The ratio of the control dry density of the soil to the maximum dry density.
2.0.6 preloading with surcharge of fill
The treatment method of piled load on the foundation to consolidate and compact the foundation soil.
2.0.7 vacuum preloading
Use vacuum to make the foundation soil drainage and consolidation treatment method.
2.0.8 Composite foundation with cement-flyash-gravel
columns
The composite foundation of the pile is formed by mixing cement, fly ash, crushed stone and other mixtures with water and drilling and pouring in the soil.
2.0.9 composite foundation with compacted lime-soil columns
Fill the hole with lime soil, tamping layer by layer, so that the surrounding soil is compacted, and a composite foundation of vertical reinforcement is formed.
2.0.10 composite foundation with squeezed sand-gravel columns
Squeeze the gravel, sand or sand-gravel mixture into the formed hole to compact the surrounding soil and form a vertical reinforcement
Composite foundation.
2.0.11 composite foundation with mixed cement-soil columns
Cement is used as the main curing agent, and the curing agent and the foundation soil are forcedly mixed by a stirring machine to form a vertical reinforcement
-3-
Composite foundation.
2.0.12 squeezing sludge by filling stones
A method of dumping schist or block stones on the soft foundation, and squeezing out the silt by the gravity of the dumping to form a rock pile.
2.0.13 squeezing sludge by blasting
Explosive packs are buried in the soft soil layer at the front edge of the dumped rock mass. Through the blasting dynamic effect, the rock mass is turned towards the soft soil.
A method of squeezing the soft soil away from the bottom to form a riprap replacement body.
2.0.14 jet grouting
Use high-pressure water or high-pressure slurry to form a high-speed jet stream to impact, cut, and destroy the soil, and use a cement matrix
The grout is filled and mixed to form a pile or curtain wall-like condensate to improve the foundation's anti-seepage or bearing capacity.
technology.
2.0.15 Grouting reinforcement
Through hydraulic fracturing and infiltration, cement slurry or other slurries are injected into the foundation soil to enhance the connection between soil particles...
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