钻孔灌注桩桩端后压浆技术作用机理研究
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摘要
随着经济建设的飞速发展,桩基被广泛应用于建筑行业,在桩基领域里,为了提高桩的承载力,工程采用了长桩和超长桩,但造价随之增加,此方法不是很理想,近年来出现了后压浆灌注桩这一新技术。
本文介绍了后压浆灌注桩的施工工艺和压浆材料,阐述了渗透压浆、劈裂压浆和压密压浆的作用机理,从理论上分析了后压浆技术在桩端土层的作用机理,并且通过对压浆前后灌注桩的静载实验,从桩的沉降量和承载力两方面进行分析研究,阐述了后压浆通过压密、渗透、劈裂、充填等作用,改善了桩端、桩周土体的物理力学性质,使桩的沉降减小。对桩的极限承载力进行计算分析,得出对于本实验用规范经验公式来计算极限承载力值偏于保守,本文采用桩顶沉降量与桩顶荷载的曲线拟合关系来反算出桩的极限承载力,并通过对桩端持力层极限端阻力标准值进行修正,提出后压浆灌注桩极限承载力修正公式。实验得出,对桩端压浆后,在同等荷载下,桩的沉降减明显减小,桩的承载力明显提高。
通过对压浆前后的桩进行ANSYS有限元软件数值模拟,模拟灌注桩压浆前后的加载过程,从桩身沉降和桩端土位移方面,分析和研究加载过程中灌注桩工程特性的变化过程。将数值计算的结果与试验结果进行比较,分析了计算结果的合理性,指出了数值计算的可行性,并验证了用桩顶沉降量与桩顶荷载的曲线拟合关系来反算出桩的极限承载力在本次实验中的可行性。
研究表明,灌注桩后压浆技术明显地改善灌注桩的工程特性,很好地提高了桩的极限承载力,具有良好的工程应用前景、社会效益和经济效益。
Along with the rapid development of economic construction, piles are widely used in building industry, in the pile field, project adopted long pile and super-long pile in order to improve the bearing capacity of the pile, but which cost increase, this method is not very ideal. In recent years, post-grouting appeared in pile to improve the bearing capacity of the pile, which is a new technology.
The article introduced the construction technology and grouting materials of post-grouting pile, expound the mechanism of plasma osmolality, splitting grouting and compaction grouting, analyses the mechanism of the post-grouting technology of pile soil. Through the load test on pile before and after post-grouting, from the pile bearing capacity and settlement two aspects to analysis, expound the affect of compaction, penetration, splitting and filling, which improved the physical and mechanical properties of soil around pile, so that reduced settlement. Through calculation and analysis of the ultimate bearing capacity, for this experiment, derived empirical formula to calculate the ultimate bearing capacity values are somewhat conservative, this paper through pile settlement and pile top load curve fitting relationship to anti-calculate the ultimate bearing capacity of pile, and through the amendment of the support layer of pile tip resistance standard value limit, propose the grouting pile bearing capacity formula, Experiment shows that after grouting, pile settlement significantly reduced and the capacity of pile has improved significantly under the same load.
By ANSYS finite element software for before and after groutingpile of numerical simulation, simulate before and after grouting pile loading process. From the settlement of pile and the pile endpoint soil displacement, analyses and research the changing process of engineering properties in the pile loading process. Compared the numerical results and experimental results, analyses the reasonableness of calculated results, pointed out the feasibility of numerical calculation, and validated that using pile settlement and the pile top load curve fitting relationship to anti-calculate the ultimate bearing capacity of piles in this experiment is feasible.
Studies shown that, post-grouting pile technology significantly improved the engineering properties of pile, well increase the ultimate bearing capacity of pile, which has a good prospect of engineering application, social and economic benefits.
本文介绍了后压浆灌注桩的施工工艺和压浆材料,阐述了渗透压浆、劈裂压浆和压密压浆的作用机理,从理论上分析了后压浆技术在桩端土层的作用机理,并且通过对压浆前后灌注桩的静载实验,从桩的沉降量和承载力两方面进行分析研究,阐述了后压浆通过压密、渗透、劈裂、充填等作用,改善了桩端、桩周土体的物理力学性质,使桩的沉降减小。对桩的极限承载力进行计算分析,得出对于本实验用规范经验公式来计算极限承载力值偏于保守,本文采用桩顶沉降量与桩顶荷载的曲线拟合关系来反算出桩的极限承载力,并通过对桩端持力层极限端阻力标准值进行修正,提出后压浆灌注桩极限承载力修正公式。实验得出,对桩端压浆后,在同等荷载下,桩的沉降减明显减小,桩的承载力明显提高。
通过对压浆前后的桩进行ANSYS有限元软件数值模拟,模拟灌注桩压浆前后的加载过程,从桩身沉降和桩端土位移方面,分析和研究加载过程中灌注桩工程特性的变化过程。将数值计算的结果与试验结果进行比较,分析了计算结果的合理性,指出了数值计算的可行性,并验证了用桩顶沉降量与桩顶荷载的曲线拟合关系来反算出桩的极限承载力在本次实验中的可行性。
研究表明,灌注桩后压浆技术明显地改善灌注桩的工程特性,很好地提高了桩的极限承载力,具有良好的工程应用前景、社会效益和经济效益。
Along with the rapid development of economic construction, piles are widely used in building industry, in the pile field, project adopted long pile and super-long pile in order to improve the bearing capacity of the pile, but which cost increase, this method is not very ideal. In recent years, post-grouting appeared in pile to improve the bearing capacity of the pile, which is a new technology.
The article introduced the construction technology and grouting materials of post-grouting pile, expound the mechanism of plasma osmolality, splitting grouting and compaction grouting, analyses the mechanism of the post-grouting technology of pile soil. Through the load test on pile before and after post-grouting, from the pile bearing capacity and settlement two aspects to analysis, expound the affect of compaction, penetration, splitting and filling, which improved the physical and mechanical properties of soil around pile, so that reduced settlement. Through calculation and analysis of the ultimate bearing capacity, for this experiment, derived empirical formula to calculate the ultimate bearing capacity values are somewhat conservative, this paper through pile settlement and pile top load curve fitting relationship to anti-calculate the ultimate bearing capacity of pile, and through the amendment of the support layer of pile tip resistance standard value limit, propose the grouting pile bearing capacity formula, Experiment shows that after grouting, pile settlement significantly reduced and the capacity of pile has improved significantly under the same load.
By ANSYS finite element software for before and after groutingpile of numerical simulation, simulate before and after grouting pile loading process. From the settlement of pile and the pile endpoint soil displacement, analyses and research the changing process of engineering properties in the pile loading process. Compared the numerical results and experimental results, analyses the reasonableness of calculated results, pointed out the feasibility of numerical calculation, and validated that using pile settlement and the pile top load curve fitting relationship to anti-calculate the ultimate bearing capacity of piles in this experiment is feasible.
Studies shown that, post-grouting pile technology significantly improved the engineering properties of pile, well increase the ultimate bearing capacity of pile, which has a good prospect of engineering application, social and economic benefits.
引文
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