边坡–锚固结构受力特性与预应力损失研究

doi:10.13722/j.cnki.jrme.2021.0649

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摘要预应力锚索是边坡加固中最常见的支护手段，揭示其预应力时程变化规律对开展加固边坡的长期稳定性研究具有重要意义。首先以剪切滞模型为基础，研究预应力锚索锚固结构三要素(锚筋、砂浆体及围岩)的受力特性及荷载传递机制，得到锚固结构界面剪应力及锚筋轴向应力分布的计算公式。进一步地根据锚筋–砂浆体界面剪应力是否超过两者接触界面黏结强度，提出预应力耦合模型与预应力解耦模型；其中，预应力解耦模型是基于剪切滞模型建立，可计算锚索预应力最终平稳值。最后，以水布垭水电枢纽马崖高边坡锚固工程为实例，探究预应力时程变化规律并提出预测公式。研究结果表明：锚固结构界面剪应力分布及锚筋轴向应力分布曲线均呈负指数型衰减的特征；实际监测数据的拟合结果证明该预测公式的合理性；理论计算平稳值与实际预应力平稳值误差最大值仅为2.17%，验证预应力解耦模型的准确性。

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	宋明刚1
	向欣2
	章广成1
	杨新志1
	闻炼1

关键词 ：边坡工程, 剪切滞模型, 荷载传递, 锚固结构应力, 预应力损失

Abstract：Prestressed anchor cable is the most common support method in slope reinforcement，and revealing its prestressing time-history change law is of great significance to the long-term stability study of reinforced slopes. Firstly，based on the shear lag model，the force characteristics and load transfer mechanism of the prestressed anchor cable anchoring structure's three elements(anchor bars，mortar and surrounding rock) are studied ，and the calculation formulas for the shear stress at the interface of the anchoring structure and the axial stress distribution of the anchor bars are obtained. Furthermore，according to whether the shear stress at the anchor bar-mortar interface exceeds the bond strength of the two contact interfaces，a prestress coupling model and a prestress decoupling model are proposed；among them，the prestress decoupling model is established based on the shear lag model，which can calculate the final stable value of the anchor cable prestress. Finally，taking Maya High Slope Anchorage Project of the Shuibuya Hydropower as an example，the time-history variation law of the prestress is explored and the prediction formula is put forward. The research results show that the shear stress distribution and the axial stress distribution are characterized by negative exponential attenuation；The fitting result of actual monitoring data proves the rationality of the prediction formula；The maximum error between the calculated stationary value and the actual pre-stress stationary value is only 2.17%，which verifies the accuracy of the prestress decoupling model.

Key words： slope engineering shear lag model load transfer anchor structure stress prestress loss

引用本文:

宋明刚1，向欣2，章广成1，杨新志1，闻炼1. 边坡–锚固结构受力特性与预应力损失研究[J]. 岩石力学与工程学报, 2022, 41(S1): 2791-2800.
SONG Minggang1，XIANG Xin2，ZHANG Guangcheng1，YANG Xinzhi1，WEN Lian1. Study on the mechanical characteristics and prestress loss of slope-anchored structure. , 2022, 41(S1): 2791-2800.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0649 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/2791

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