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以载荷试验得到的荷载~沉降数据为基础,分析了4种数据归一化方法对荷载~沉降曲线拐点位置的影响,探讨了由荷载~沉降曲线求解极限承载力的3种方法,求解了其拟合参数的概率统计特征。研究表明:采用双曲线模型可以较好地拟合载荷试验得到的荷载~沉降数据。根据荷载~沉降曲线,采用拐点法、沉降法及参数法求得的承载力依次增大,求解极限承载力较好的方法是沉降法。若想准确得到荷载~沉降曲线的拐点位置,应首先对荷载及沉降同时进行归一化,然后进行曲线拟合。采用双曲线模型拟合荷载~沉降曲线时,两个拟合参数间存在较强的负相关性。
Based on the load-settlement data obtained from the load test, the effects of the four data normalization methods on the inflection point of the load-settlement curve are analyzed. Three methods for solving the ultimate bearing capacity from the load-settlement curve are discussed. Probability and Statistics of Fitting Parameters. The research shows that the hyperbolic model can well fit the load-settlement data obtained from the load test. According to the load-settlement curve, the bearing capacity obtained by the inflection point method, settlement method and parameter method increases in order, and the method of solving the ultimate bearing capacity is the settlement method. If you want to get the exact position of the inflection point of the load-settlement curve, you should first normalize the load and settlement at the same time, and then curve fit. When using hyperbola model to fit load-settlement curve, there is a strong negative correlation between the two fitting parameters.