Estimation of Screw Displacement Pile-Bearing Capacity Based on Drilling Resistances

IF 0.7 Q4 MECHANICS
Adam Krasiński
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引用次数: 0

Abstract

Abstract This article presents an engineering, empirical method of estimating the bearing capacity and settlement characteristics Q-s of screw displacement piles and columns, based on soil resistance encountered during the drilling to form piles/columns in the ground. The method was developed on the basis of correlation analyses of the test results of 24 piles made during the “DPDT-Auger” research project (Krasiński et al., 2022a). In the proposed method, the load capacity of a screw displacement pile is estimated using two main parameters of auger screwing resistance: torque M T and the number of auger rotations per depth unit n R . The method applies to piles and columns made with a standard screw displacement pile (SDP) auger and with the proprietary, prototype DPDT ( displacement pile drilling tool ) aguer, patented in Poland (2020). Based on the estimated ultimate capacities of the pile shaft and base, an approximate method of predicting the pile settlement characteristics Q-s was also proposed, using the transfer function method. This article describes a correlation procedure of field test results together with their statistical analysis and presents a method of estimating the pile-bearing capacity based on correlation results. A calculation example is also provided. The conclusion looks at the useful practical applications that could be found for the proposed method.
基于钻孔阻力的螺旋位移桩承载力估算
摘要本文提出了一种基于钻孔成桩/柱过程中遇到的土阻力估算螺旋位移桩/柱承载力及沉降特性Q-s的工程经验方法。该方法是在“DPDT-Auger”研究项目(Krasiński et al., 2022a)中对24桩试验结果进行相关性分析的基础上发展起来的。该方法利用螺旋钻旋入阻力的两个主要参数:扭矩M T和螺旋钻每深度单位旋转数n R来估计螺旋位移桩的承载能力。该方法适用于使用标准螺杆位移桩(SDP)螺旋钻机和专利的原型DPDT(位移桩钻孔工具)aguer(在波兰获得专利(2020年))制成的桩和柱。在估计桩身和桩底极限承载力的基础上,提出了一种用传递函数法近似预测桩沉降特性Q-s的方法。本文介绍了现场试验结果的关联过程及其统计分析,提出了一种基于关联结果估算桩承载力的方法。并给出了计算实例。结论部分探讨了所提方法的实际应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
1.30
自引率
16.70%
发文量
20
审稿时长
16 weeks
期刊介绍: An international journal ‘Studia Geotechnica et Mechanica’ covers new developments in the broad areas of geomechanics as well as structural mechanics. The journal welcomes contributions dealing with original theoretical, numerical as well as experimental work. The following topics are of special interest: Constitutive relations for geomaterials (soils, rocks, concrete, etc.) Modeling of mechanical behaviour of heterogeneous materials at different scales Analysis of coupled thermo-hydro-chemo-mechanical problems Modeling of instabilities and localized deformation Experimental investigations of material properties at different scales Numerical algorithms: formulation and performance Application of numerical techniques to analysis of problems involving foundations, underground structures, slopes and embankment Risk and reliability analysis Analysis of concrete and masonry structures Modeling of case histories
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