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基坑开挖全过程的地表沉降量可用Logistic生长模型来描述。考虑到模型适用范围和预测精度等问题,结合工程实例,比较了模型中参数K的三种估计方法,并用线性回归获得另外两个参数a、r,应用结果表明:三种方法拟合精度都较高,其中以三点法最优;在沉降发展的时间预测上,根据模型的数学意义,以拐点法最优,三点法和四点法预测效果不理想。
Surface subsidence during excavation can be described by Logistic growth model. Considering the problems such as the scope of the model and the prediction accuracy, the three estimation methods of the parameter K in the model are compared with the engineering examples. The other two parameters a and r are obtained by linear regression. The results show that the fitting accuracy of the three methods Which is best by three-point method. On the time prediction of settlement development, according to the mathematical meaning of the model, the inflection point method is the best, the three-point method and the four-point method are not ideal.