全长黏结式锚杆锚固段荷载传递特性研究

doi:10.13722/j.cnki.jrme.2017.0186

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摘要

针对全长黏结式锚杆界面剪应力分布及荷载传递问题，从锚固体界面剪切位移分布曲线的统一形式出发，建立无限长锚体界面的位移、轴力以及剪切应力的求解公式，推导出与黄明华模型实质相同的双指数曲线本构模型以及锚体顶部荷载位移曲线的指数形式，并将该求解公式进一步修正推广至有限长锚体，得到修正后的全长黏结式锚杆接触面荷载位移解答，并且该解答揭示的锚固体接触面本构关系能够反映锚固深度变化带来的影响，规避了均匀统一本构假设的局限性，具有更高的适用性。通过工程实例进行验证，结果表明，该方法具有可行性，并可据此进行锚杆拉拔荷载传递的全历程分析。

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	周炳生1
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	王保田1
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	梁传扬1
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	王远航1
	2

关键词 ：岩土工程, 有限长锚杆, 本构模型, 荷载传递, 修正解答, 非均匀性

Abstract：

The purpose of this paper is to figure out the distribution of interfacial shear stress and how the load transfers. Based on the uniform form of shear displacement distribution curve，the formula for calculating the displacement，axial force and side resistance of infinite-length anchor bar was established. The constitutive model of double exponential curve was derived，which is essentially the same as that of Huang Minghua Model. Also，the exponential form of load-displacement curve at the top of anchor bar was deduced. The formula was further modified to apply to the finite-length anchor bar，and thus the modified formula of load and displacement distribution was obtained，by which the constitutive relation of the contact surface of the anchor can be explained with anchorage depth varies. It is noted that the modified formula avoids the limitation of the assumption that the constitutive relation at the contact surface is uniform and thus the modified formula has higher applicability. It was then verified by an engineering example. And based on this method，the whole working course for the force transferring mechanism of the anchor bar was analyzed.

Key words： geotechnical engineering finite-length anchor bar constitutive model load transfer revised formula non-uniformity

引用本文:

周炳生1，2，王保田1，2，梁传扬1，2，王远航1，2. 全长黏结式锚杆锚固段荷载传递特性研究[J]. 岩石力学与工程学报, 2017, 36(S2): 3774-3780.
ZHOU Bingsheng1，2，WANG Baotian1，2，LIANG Chuanyang1，2，WANG Yuanhang1，2. Study on load transfer characteristics of wholly grouted bolt. , 2017, 36(S2): 3774-3780.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0186 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/3774

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