厚冲积黏性土层锚索预应力损失计算模型研究

发布时间：2018-06-04 20:28

本文选题：预应力锚固 + 计算模型　；参考：《公路》2016年12期

【摘要】：基于等效应变原理,将锚索与被锚固围岩分别由马克思韦尔体、开尔文体模拟,建立了一种考虑锚索与被锚固围岩之间耦合作用关系的新元件计算模型,并推导了其本构方程、蠕变方程、松弛方程,从理论上解释了锚索预应力损失与围岩变形之间的计算关系;以济南市某深基坑桩锚支护体系为工程背景,通过理论计算、现场测试、公式拟合等方法对比分析了该模型计算结果现场测试数据,结果表明,该模型能够能够很好地反映出锚索预应力的变化规律,呈现出初期骤降,中期平稳减小,后期基本不变的趋势;该模型较未考虑耦合效应的模型(广义开尔文体)计算结果更贴近试验数据,更能反映出锚索预应力真实变化规律;研究成果为预应力工程的设计、施工提供了理论依据和技术支持。
[Abstract]:Based on the principle of equivalent strain, the anchor cable and the anchored surrounding rock are simulated by Maxwell body and Kelvin body respectively. A new element calculation model considering the coupling relationship between the anchor cable and the anchored surrounding rock is established, and its constitutive equation is derived. Creep equation, relaxation equation, the calculation relation between anchor cable prestress loss and surrounding rock deformation is explained theoretically, taking the pile-anchor support system of a deep foundation pit in Jinan as the engineering background, through theoretical calculation, field test, The field test data of the calculation results of the model are compared and analyzed by the method of formula fitting. The results show that the model can well reflect the variation law of anchor cable prestress, showing a sudden drop in the initial period and a steady decrease in the medium term. The result of this model is more close to the experimental data than that of the model without coupling effect (generalized Kelvin body), which can reflect the true variation law of anchor cable prestress, and the research result is the design of prestressed engineering. The construction provides theoretical basis and technical support.
【作者单位】：福建工程学院;山东科技大学土木工程与建筑学院;
【基金】：国家自然科学基金项目;项目编号41472280
【分类号】：TU476

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