钻孔灌注桩后注浆技术在廊坊文化艺术中心项目的应用分析

发布时间：2018-04-30 02:38

本文选题：钻孔灌注桩 + 桩基持力层　；参考：《天津大学》2014年硕士论文

【摘要】：本文第一部分先介绍了钻孔灌注桩后注浆技术国内外的发展现状，以及该技术的工作原理和作用机理，结合举例国内大量钻孔灌注桩后注浆试桩静力载荷试验效果的对比数据，说明在不同的岩土工程地质条件下，桩底（桩侧）后注浆对不同桩基持力土层（基岩、砂砾、粉砂土、粘土）中钻孔灌注桩的适用性，即后注浆对单桩承载力的提高幅度，持力土层从粘土－粉砂－砂层－砾石层，颗粒越粗、桩底后注浆的效果越好。本文第二部分先简述了廊坊文化艺术中心主题园工程建设项目的特征及桩基设计要求，根据《岩土工程勘察报告》，具体描述了项目地基持力土层物理力学性质和桩基参数，并介绍了试桩施工专项施工方案中的重点施工工艺及质量保证措施，然后具体分析了廊坊文化艺术中心主题园建设工程项目第一、第二次工程静力载荷试桩以及调整桩基设计的经过，用具体的试验数据说明钻孔灌注桩后注浆技术对不同持力土层的效果不同，科学合理的估算工程项目钻孔灌注桩后注浆对单桩承载力增幅，是设计必须审慎计算和考虑的。通过搜集大量相似工程地质条件的桩基注浆效果，对比分析在廊坊地区粉砂、粉细砂、粉质粘土土层中桩基后注浆效果，并讨论可能影响影响注浆效果的因素，最后对比本工程静载结果的数据得出结论：在桩长34m时，桩侧土层粉砂、粉细砂、粉质粘土为主，，桩底持力层为粉质粘土、粉细砂的钻孔灌注桩，桩底桩侧采用复合后注浆施工工艺后，单桩承载力极限值提高1860～2386kN，合理可控的承载力增幅应在35%～40％之间的结论，以期为今后的设计与施工提供依据。
[Abstract]:The first part of this paper first introduces the development of post-grouting technology of bored pile at home and abroad, as well as the working principle and working mechanism of the technology, and combines with the comparative data of static load test results of a large number of domestic examples of post-grouting test piles of bored cast-in-place piles in China. It is shown that under different geotechnical engineering geological conditions, the applicability of post-grouting of pile bottom (side of pile) to bored pile in different soil layers of pile holding capacity (bedrock, gravel, silty sand, clay), that is, the increase of bearing capacity of single pile by post grouting. From clay-silt-sand-gravel layer, the thicker the grain, the better the grouting effect after pile bottom. In the second part of this paper, the characteristics of the construction project of Langfang Culture and Art Center theme Park and the design requirements of pile foundation are briefly introduced. According to the Geotechnical Engineering Survey report, the physical and mechanical properties and pile foundation parameters of the soil layer of the foundation of the project are described concretely. This paper also introduces the key construction technology and quality assurance measures in the special construction plan of test pile construction, and then analyzes concretely the construction project of Langfang Culture and Art Center theme Park. The static load test pile of the second engineering and the process of adjusting the design of pile foundation are used to show that the grouting technology after bored pile has different effects on different soil layers with different holding capacity with concrete test data. The scientific and reasonable estimation of the increase of the bearing capacity of single pile after grouting of bored cast-in-place pile in engineering project must be carefully calculated and considered in the design. By collecting a large number of similar engineering geological conditions, the grouting effect of pile foundation in Langfang area is compared and analyzed, and the factors that may affect the grouting effect are discussed. Finally, by comparing the static load data of the project, the conclusion is drawn: when the pile length is 34m, silty sand, silty sand and silty clay are dominant in the soil layer of the pile side, the bearing layer of the pile bottom is silty clay, and the bored pile with fine silty sand. The limit value of bearing capacity of single pile is increased by 1860 ~ 2386kN, and the reasonable and controllable increase of bearing capacity should be in the range of 3540% after adopting compound post-grouting construction technology on the pile bottom side, in order to provide the basis for the design and construction in the future.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753.3

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