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Research and application of schemes for constructing concrete pillars in large section finishing cut in backfill coal mining 被引量:3
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作者 Sun Qiang Zhang Jixiong +2 位作者 Ju Feng Li Linyue Zhao Xu 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第6期915-920,共6页
Based on the technology of controlling surrounding rock deformation by constructing concrete pillars in large section finishing cut in backfill coal mining, the characteristics of vertical stress on concrete pillars a... Based on the technology of controlling surrounding rock deformation by constructing concrete pillars in large section finishing cut in backfill coal mining, the characteristics of vertical stress on concrete pillars and main factors influencing pillar stability are analyzed. By building a Winkler elastic foundation mechanical model for the support system constituted of coal pillar, backfill body and concrete pillars, mechanical calculation on stability of concrete pillar is carried out to evaluate the pillar stability and safety. Seven numeral models in three schemes with different pillar sizes, inter-row distances and compression ratios at the stopes were analyzed through numerical simulation according to width reduction principle. The practice of finishing cut at IIIB44 workface at Yangzhuang coal mine shows that: when the actual compression ratio is 86.5%, construction size inside the finishing cut is 2000 mm x 2000 mm and the interval between concrete pillars is 2000 mm x 2000 mm, the pillars can be stable with the maximum movement of two sides of each pillar being only 83 mm and 54 mm, which achieves the expected effect. 展开更多
关键词 Concrete pillar Finishing cutNumerical simulation Surrounding rock deformation
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Experimental study on interaction mechanism of small H-beams and a soil-cement retaining wall
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作者 WANG Suo-rong CAO Bao-fei 《Journal of China University of Mining and Technology》 EI 2008年第1期149-152,共4页
Small H-beams such as the No.14-20 I-steel can be inserted into soil-cement retaining walls to form small H-beam soil-cement compound walls, functioning both as a retaining wall and a cutoff wall for braced structure ... Small H-beams such as the No.14-20 I-steel can be inserted into soil-cement retaining walls to form small H-beam soil-cement compound walls, functioning both as a retaining wall and a cutoff wall for braced structure excavations. Being different from the mixed soil-cement wall (SMW), the interaction between soil-cement and small H-steel is very good. We have carried out a series of bending experiments on small H-beams in soil-cement model compound beams to study the mechanism of interactions. The results show that the interaction between H-beams and soil-cement is very good, whether the H-beam is single or double. Joint forms of double H-beams at one end have little effect on both the contribution coefficient and on ultimate deflection before cracking. But after cracking, the joint forms greatly affect the contribution coefficient. We conclude that the rigid joint girder for double H-beams is a better choice in oractice. 展开更多
关键词 small H-steel soil-cement compound beam rigidity contribution coefficient ultimate deflections soil type experi-mental study
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Application of CFG Pile Construction Technology for Soft Foundation Treatment
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作者 Deng Lin 《International Journal of Technology Management》 2013年第1期7-10,共4页
CFG pile has been widely applied as one of the common ground treatment techniques. As a concealed work, the construction quality of pile foundation not only relates to the success of the project, but also concerns the... CFG pile has been widely applied as one of the common ground treatment techniques. As a concealed work, the construction quality of pile foundation not only relates to the success of the project, but also concerns the benefits of thousands of hot, seholds. Only strengthening the supervision and management during the construction and strictly designing and specifying CFG pile can ensure the construction quality of CFG pile. But most researches focus on operating mechanism and theoretical analysis, and there are fewer researches about the construction of CFG pile. The real construction of CFG pile has no specified operation and lacks of the construction guidance, which not only causes great problems and has great influence on the intensity of CFG pile, but also makes the real pile body have great difference from the design requirements. Therefore, the study on construction of CFG pile in the paper has great significance. 展开更多
关键词 CFG pile soft foundation treatment reinforcement mechanism construction technology quality control
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Study on main contents of design of rock fill dam with face slab
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作者 ZHANG Yankui LIU Xiaolian ZHANG Yan kui 《International English Education Research》 2016年第4期20-22,共3页
With the development of economy, the adjustment of industrial structure, the improvement of people's living standard and the expansion of urbanization, the structure of the city has changed a lot. The proportion of i... With the development of economy, the adjustment of industrial structure, the improvement of people's living standard and the expansion of urbanization, the structure of the city has changed a lot. The proportion of industrial use of electricity decreased year by year, the proportion of household electricity, commercial electricity and public utilities increased year by year, the peak and valley change increased year by year. Therefore, the construction of hydropower project, to improve the current situation of the system of regulating the power grid, has a positive role in promoting. Reinforced rock fill dam with face slab in foreign countries has been built and at the dam more than 50m high dam more than 70 seats, of which more than 100m high dam 18. At present, Brazil estuary aliya rock fill dam is the highest dam in this kind of dam in the world, built in 1980, has been running well. Our reinforced rock fill dam with face slab design and construction technology in the introduction of digestion and absorption of foreign advanced experience in the foundation, the systemic research on a considerable scale. The design level and construction technology of the rock fill dam with face slab in our country have reached the international advanced level by the complete technology of the construction of the 100m level rock fill dam with face slab. This paper mainly from the rock fill dam with face slab, dam type selection and layout of water conservancy project comparison; dam profile design; detail dam; dam high determined; stability analysis; strength calculation; overflow capacity check aspects were studied. 展开更多
关键词 Rock fill dam with face slab Dam design Dam stress analysis Stability check
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多种破桩方法的综合应用技术
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作者 邓委 卢程 《建筑科技情报》 2015年第1期7-10,共4页
随着现代建筑技术的高速发展。超高层、软土地基建筑物多采用桩筏基础,钻孔灌注桩、人工挖孔桩的应用非常普遍。桩头破除是桩基施工的最后一环,是土方开挖后期与承台基础施工相衔接的关键性工序,也是施工组织中容易忽视的环节。由于... 随着现代建筑技术的高速发展。超高层、软土地基建筑物多采用桩筏基础,钻孔灌注桩、人工挖孔桩的应用非常普遍。桩头破除是桩基施工的最后一环,是土方开挖后期与承台基础施工相衔接的关键性工序,也是施工组织中容易忽视的环节。由于桩的位置、超灌长度、重要性不同,须合理选用破桩(整体吊装、破碎锤和人工剔凿)施工工艺.保证施工进度、质量,同时节约成本。徐州苏宁广场项目工程突破工程常规做法.通过综合应用桩头破除工艺,达到了方便施工、质量保证、节约成本和节省工期的目的。为类似工程提供了可借鉴的施工经验。 展开更多
关键词 超灌 多种破桩方法(整体吊装 破碎锤 人工剔凿)综合应 用施工技术
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