| 土遗址全长黏结式锚固系统动力响应解析方法 |
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| 引用本文： | 芦苇,赵冬,李东波,毛筱霏. 土遗址全长黏结式锚固系统动力响应解析方法[J]. 岩土力学, 2020, 41(4): 1377-1387. DOI: 10.16285/j.rsm.2019.0576 |
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| 作者姓名： | 芦苇 赵冬 李东波 毛筱霏 |
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| 作者单位： | 1. 西安建筑科技大学 理学院，陕西 西安 710055；2. 西部绿色建筑国家重点实验室/西安建筑科技大学，陕西 西安 710055 |
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| 基金项目： | 国家自然科学基金（No. 51878547）；中国博士后基金（No. 2018M633478）；西部绿色建筑国家重点实验室开放基金（No. LSKF202010）；陕西省自然科学基础研究计划项目（No. 2020JQ-671）。 |
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| 摘 要： | 以纵向宽大裂隙引起的夯土城墙遗址稳定问题为背景，建立危险土体?锚杆?稳定土体锚固系统简化力学模型。该模型将土体对锚杆的摩阻作用简化为一个线性弹簧和一个与速度相关的阻尼器的并联机构，将裂隙段锚杆对两侧土体的拉结作用简化为一个线性弹簧。基于弹性体动力理论建立锚固系统动力平衡方程，并推导了锚杆轴力和位移的动力响应解析解。最后，以新疆高昌故城南城墙某段锚固工程为例对提出的解析方法进行了说明，明确了锚杆轴力响应特征及其分布规律，并通过数值分析对其合理性进行了验证。结果表明：在动力作用下同一位置锚杆的轴力响应呈围绕静力平衡位置的波动形态，轴力峰值点位于裂隙附近，且逐渐向临空端和锚固端指数衰减。在考虑地震加速度沿遗址高度的放大效应后能够获得较精确的锚杆轴力响应。
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| 关 键 词： | 土遗址 全长黏结式锚杆 锚固系统 简化力学模型 动力响应 |
| 收稿时间： | 2019-03-26 |
| 修稿时间： | 2019-08-21 |
Analytical method for dynamic response of fully grouted anchorage system of rammed earth sites |
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| LU Wei,ZHAO Dong,LI Dong-bo,MAO Xiao-fei. Analytical method for dynamic response of fully grouted anchorage system of rammed earth sites[J]. Rock and Soil Mechanics, 2020, 41(4): 1377-1387. DOI: 10.16285/j.rsm.2019.0576 |
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| Authors: | LU Wei ZHAO Dong LI Dong-bo MAO Xiao-fei |
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| Affiliation: | 1. School of Science, Xi’an University of Architecture & Technology, Xi’an, Shaanxi 710055, China;2. State Key Laboratory of Green Building in Western China, Xi’an University of Architecture & Technology, Xi’an, Shaanxi 710055, China |
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| Abstract: | A simplified mechanical model of dangerous soil mass-anchor bolt-stabilized soil mass anchorage system is established against the background of instability of rammed earth sites caused by wide vertical cracks. In this model, friction between the anchor bolt and the soil mass is simplified into a parallel mechanism of a linear spring together with a speed-related damper, and the connect effect of anchor bolt in crack section is simplified as a linear spring. Dynamic equilibrium equations for the anchoring system are established based on the theory of elastodynamics, and analytic solutions of dynamic response of bolt axial forces and displacement are deduced. Finally, the analytic method proposed by this paper is applied to the anchorage engineering of the southern wall of the Gaochang Ancient City in Xinjiang to analyze the axial force response characteristics and distribution law of the anchor bolt. The rationality of the procedure is verified by numerical analysis. The results show that the axial force response of the anchor bolt at the same position under dynamic action fluctuates around the static equilibrium position, the position of the maximum axial force is near the crack and gradually decreases exponentially toward the free end and the anchor end. And after considering the amplification effect of the seismic acceleration along the height of the site, a more accurate axial force response of anchor bolt can be obtained. |
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| Keywords: | rammed earth sites wholly grouted anchor bolt anchorage system simplified mechanical model dynamic response |
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