In recent years, with the rapid development of building foundation engineering in China, more and more attention has been paid to the key and difficult problems of foundation design and geotechnical engineering investigation involved in major engineering projects and typical cases
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If you want to see the summary of foundation design, construction and reinforcement experience of completed or under construction projects, and want to further understand the new construction method, new equipment, new technology, new process and new design method of foundation under complex geological conditions, you should quickly collect this dry goods king! Topic lecture content (click on the topic to view the video) 1
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Gu Guorong’s development concept and practice of geotechnical engineering integrated consulting service; 2
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Shen Xiaoke’s interpretation and Prospect of geotechnical engineering whole process consulting policy; 3
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Qiu Jianjin’s difficult challenges and Countermeasures of Dawan district Foundation Engineering; 4
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Jie Yuxin’s how to make good use of finite element; 5
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Liu Yansheng’s looking at foundation design from the principle of soil mechanics; 6 Zhu Chunming, discussion on design and calculation of pile foundation under soft foundation conditions 7
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He Shiming, application of stress dispersive prestressed anti pulling pile in anchor pile of large tonnage engineering pile static load test 8
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Wei Jianhua, analysis on design and construction of static pressure pile 9
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Shui Weihou, engineering practice of dynamic compaction Foundation treatment of large area backfill site 10
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Sun Hongwei, conception and cause and effect of pile foundation design 01 geotechnical engineering Gu Guorong, National Master of engineering survey and design, technical director of Shanghai survey and Design Institute (Group) Co., Ltd
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(click the picture to view the video)
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Main content: in recent years, the state vigorously promotes “whole process engineering consulting”, covering the whole project cycle, which can significantly improve work efficiency and project quality, and realize risk control and saving The purpose of construction period cost and environmental protection
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This report focuses on the collaborative service mode including survey, design, construction, monitoring and detection, which is gradually formed in the exploration process of geotechnical engineering integration in the survey industry
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The service cycle basically covers the whole process of survey, design, construction and monitoring of underground engineering
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Through typical cases, the paper introduces the service mode in super high-rise pile foundation, foundation pit engineering and existing foundation pit engineering The experience of integrated consulting service in the field of building reinforcement, underpinning and deviation correction has promoted the technical progress of geotechnical engineering in China, brought the role of geotechnical engineer into full play, and achieved the goal of increasing investment value, avoiding risks and ensuring engineering quality of customer projects
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(click the picture to view the video) 02 “interpretation and Prospect of the whole process of geotechnical engineering consulting policy” Shen Xiaoke, National Master of engineering survey and design, chairman of Beijing survey, design and Research Institute Co., Ltd
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(click the picture to view the video) main content: from the “what”, “what” and “how” of the “whole process of engineering consulting” to describe the understanding of the “whole process of engineering consulting” “Preliminary inquiry” and its preliminary understanding of the relationship with geotechnical engineering development, combined with domestic and foreign cases, expounds the concept and core concepts of the whole process engineering consultation and the problems faced, and reviews the market role transformation process of the “engineering consultation” in Chinese mainland, the development status quo of the traditional engineering survey industry, the achievements obtained, and the cultivation work of geotechnical engineering, and considers that it is urgent to play a role
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There should be a more valuable geotechnical engineering technical service industry, and a complete management system seamlessly linked with the international industry should be formed
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In the end, the author thinks that “whole process engineering consulting” should need the participation of the industry to explore a market model that meets the needs of China’s healthy development and truly creates value for the project
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(click the picture to view the video) 03 “difficulties, challenges and Countermeasures of foundation engineering in Dawan district” Qiu Jianjin, National Master of engineering survey and design, deputy general manager of Shenzhen Municipal Design and Research Institute Co., Ltd
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(click the picture to view the video) main content: the proposed value and design value of pile side resistance for deep thick sand layer and granite residual soil in coastal area are consistent with the actual engineering It is difficult to grasp the role of post grouting on the side of pile in special stratum such as deep water rich sand layer to improve the side resistance of pile
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When the drilling or rotary excavation technology of slurry wall protection is adopted for granite residual soil, the relationship between the side resistance of pile and the investigation is analyzed The reason why the lateral resistance of hard plastic soil decreases obviously is analyzed
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In addition, some examples are provided for the design of pile foundation in Karst and fault zone
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(click the picture to view the video) 04 “how to make good use of finite element” Jie Yuxin, Professor of Tsinghua University (click the picture to view the video) main content: the finite element method is essentially one of the methods to solve partial differential equations, which is to use numerical methods to solve partial differential equations
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Its theory comes from Ritz method and weighted residual method
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The constitutive model plays an important role in it
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Even for Duncan Chang model, the programming also needs to consider tension, stress is too small, and the upper and lower limits of Poisson’s ratio need to be limited
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Similar to the construction process of civil engineering, there will be small differences due to people and procedures
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Finite element calculation may not let us get the truth, but it provides us with a good way to get the truth
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Making clear the essence of mathematics, mechanics and soil mechanics is helpful for us to make good use of finite element
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(click the picture to view the video) 05 “looking at the foundation design from the principle of soil mechanics” Liu Yansheng, chief engineer of Tsinghua University architectural design and Research Institute Co., Ltd
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(click the picture to view the video) main content: soil mechanics is the application of classical elastic mechanics in soil
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Soil is a bulk material, not a real solid
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It has no strength when there is no lateral pressure
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As a result, the calculation of force and deformation in soil mechanics is different from that in elastic mechanics, so many corrections should be made according to the properties of soil
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Combined with the principle of soil mechanics, we can have a deep understanding of the mechanism of shallow foundation, pile foundation, composite foundation and soft underlying layer
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The design of foundation should take the deformation as the main control parameter to ensure the uniform and controllable deformation of foundation
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(click the picture to view the video) 06 “Discussion on design and calculation of pile foundation under soft foundation” Zhu Chunming, deputy chief engineer and researcher of urban underground space design and Research Institute of Jianyan Foundation Engineering Co., Ltd
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(click the picture to view the video) main content: the report first introduces the complexity of pile foundation design under soft foundation and the post construction of the site through four soft foundation accidents The settlement is large, not easy to be stable, and the construction is difficult, the quality is not easy to guarantee
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Through Zhejiang Zhoushan chemical engineering project, the calculation method of negative friction in the calculation of bearing capacity and settlement of pile foundation is introduced
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Through the settlement check project of 407m high Kunming Spring eye main tower, this paper introduces the settlement calculation method of pile foundation under the condition of soft foundation, and introduces the influence of upper and lower joint action on settlement calculation
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(click the picture to view the video) 07 “Application of stress dispersive prestressed anti pulling pile in anchor pile case of large tonnage engineering pile static load test” he Shiming, deputy chief engineer of Sinoma geological engineering exploration and Research Institute Co., Ltd
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(click the picture to view the video) main content: part of the cohesive stress dispersive prestressed anti pulling pile has changed the structure of steel strand cage, at the same time, the pile forming method has been changed It has changed the previous method of “extrusion anchor” positioning “reaction plate”, avoided the “bucket” effect of slurry wall underwater grouting pile forming technology, and avoided the disadvantage of the bottom key parts of the concrete and cage can not be reliably wrapped, ensured the reliability of the pile quality, so that it can smoothly enter the design elevation, so as to better play its bearing capacity and make its bearing capacity more traditional The pile formed by the pile forming method is greatly improved.
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