| 评估灌注桩极限承载力的概率能量法 |
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| 引用本文： | 娄仲连,罗国煜.评估灌注桩极限承载力的概率能量法[J].高校地质学报,1998,4(4):452-458. |
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| 作者姓名： | 娄仲连 罗国煜 |
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| 作者单位： | 南京大学地球科学系 |
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| 摘 要： | 本文研究用概率能量方法评估灌注桩极限承载力的可行性，研究所用数据取自南京市区的２００根桩例的ＣＡＰＷＡＰ反分析与静载试验结果。根据能量守恒定律并结合动态桩－土相互作用模型，详细地推导了桩极限承载力计算公式。并对其中的模型参数，Ｊｓ，Ｊｔ，Ｑｓ，Ｑｔ作为随机变量处理，统计分析了它们的平均值，标准差以及概率分布函数。用蒙特卡洛法模拟确定了桩极限承载力的概率分布函数，并进一步提出了计算桩极限承载力超过某一设计值的概率公式。通过计算的桩极限承载力与静载结果的良好可比性，说明了此方法的台理性与准确性。
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| 关 键 词： | 概率能量法 灌注桩 极限承载力 桩基础 |
| 收稿时间： | 1998-12-20 |
| 修稿时间： | 1998-12-20 |
APPLICATION OF THE PROBABILISTIC ENERGY METHOD TO EVALUATE THE ULTIMATE LOAD CAPACITY OF CAST IN SITU PILE |
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| Lou Zhonglian,Luo Guoyu.APPLICATION OF THE PROBABILISTIC ENERGY METHOD TO EVALUATE THE ULTIMATE LOAD CAPACITY OF CAST IN SITU PILE[J].Geological Journal of China Universities,1998,4(4):452-458. |
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| Authors: | Lou Zhonglian Luo Guoyu |
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| Institution: | Department of Earth Sciences, Nanjing University, Nanjing 210093 |
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| Abstract: | The feasibility of using probabilistic energy method to evaluate the ultimate load capacity of cast in situ pile has been investigated with the data derived from the results of CAPWAP back analytic and static pile load test of 200 pile cases in the urban district of Nanjing city. The dynamic soil pile interaction model,similar to that used in the CAPWAP method,is adopted in this method. The energies delivered and transformed during the high strain dynamic tests is comprehensively analyzed,and the formulas calculating pile capacity are derived based on the principle of energy balance. The model parameters,including the shaft damping factor J s, the tip damping factor J t, shaft quake Q s, and tip quake Q t are treated as random variables with mean values,standard deviations and probability distribution functions determined by a statistical analysis. The statistics of regional experiments,such as the means and standard deviations of the model parameters, are used as given values in the calculation of pile capacity. The other required values, including the energy delivered to the pile head during each hammer blow, the pile penetration of each blow,the maximum velocity at the pile head,and the pile dimesions and elastic properties,are easily measured. The distribution of pile capacity is determined through a Monte Carlo simulation. Futhermore, the authors proposed here a formula to calculate the probability of the evaluated pile capacity exceeding certain design load. The rationality and accuracy of this method are demonstrated in a comparison of the pile capacity calculated with this method and the results of static pile load test. |
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| Keywords: | e: probabilistic energy method cast in situ pile ultimate load capacity |
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