锚杆极限承载力预测模型及方法研究

Study on Prediction Model of Anchor Rod′s Ultimate Bearing Capacity and Its Method

基于双曲线模型和指数模型,采用最优加权组合建模理论,建立了锚杆Q-s曲线的最优加权几何平均组合预测模型,对锚杆的极限抗拔承载力进行预测,并详细介绍了利用Origin软件强大的非线性曲线拟合功能,求取模型参数的简便方法。通过工程实例,验证了该最优组合预测模型的可行性。对比分析结果表明,最优组合预测模型的精度高于指数模型、双曲线模型和幂函数模型,是现场锚杆抗拔试验数据的一种有效分析方法。

Based on the exponential curve model and hyperbola model, using optimum weighted composition model theory, a kind of optimum weighted geometric average composition predicted model with Q - s curves is established to predict the anchor rod＇s ultimate bearing capacity. A simple method for solving model parameters by nonlinear curve fitting using Origin software is introduced in detail. Through practical examples, the optimum weighted composition predicted model is proved its feasibility. Comparative results show that the precision of the optimum weighted composition predicted model is higher than that of the exponential curve model and hyperbola model, and prove it is an effective method for the field pull out test data of anchor rods.