渗透作用下土体蠕变与锚索锚固力损失特性研究

发布时间：2018-05-23 08:10

本文选题：蠕变 + 锚固力　；参考：《岩土力学》2017年08期

【摘要】：预应力锚索广泛应用于边坡、基坑等工程中,锚固力损失是影响其锚固效应的重要方面,由于锚固力失效而导致的工程事故屡见不鲜。特别是在降雨或者地下水丰富的地区,由于渗流作用等的影响更容易引起预应力锚索锚固体等应力状态的改变,导致锚索失效引发工程事故。以滨海某基坑为研究背景,以现场监测数据为基础,建立了一种综合考虑渗透作用下土体蠕变和预应力锚索锚固力损失三维本构模型,推导出土体蠕变和预应力锚索锚固力松弛方程。基于FLAC3D软件开发了相应的计算程序,分析了滨海某基坑渗透作用下土体蠕变和预应力锚索锚固力损失特性。结果显示,数值模拟结果与现场监测数据有较好的一致性,表明所建立的模型是正确和可行的。该方法可用于分析渗透作用下的预应力锚索锚固力损失特性,为类似工程提供理论指导和分析手段。
[Abstract]:Prestressed anchor cable is widely used in slope, foundation pit and other projects, the loss of anchoring force is an important aspect affecting its anchoring effect, and the engineering accidents caused by the failure of anchoring force are common. Especially in areas where rainfall or groundwater is abundant, the stress state of prestressed anchor cable is changed more easily because of the influence of seepage, which leads to the failure of anchor cable and the engineering accident. Based on the field monitoring data, a three-dimensional constitutive model of soil creep and anchor force loss of prestressed anchor cable is established based on a foundation pit in the coastal area. The equations of soil creep and anchoring force relaxation of prestressed Anchorage cable are derived. Based on FLAC3D software, the corresponding calculation program is developed, and the characteristics of soil creep and anchoring force loss of prestressed anchor cable under seepage action of a foundation pit in coastal area are analyzed. The results show that the numerical simulation results are in good agreement with the field monitoring data, which shows that the established model is correct and feasible. This method can be used to analyze the characteristics of anchoring force loss of prestressed Anchorage cable under the action of seepage and provide theoretical guidance and analytical means for similar projects.
【作者单位】：山东大学岩土与结构工程研究中心;
【基金】：国家自然科学基金(No.51379113,No.51134001) 高等学校博士学科点专项科研基金资助项目(No.20120131110031) 山东省杰出青年基金(No.201313JQE27042)~~
【分类号】：TU476

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