膨胀土地层锚索预应力损失与流变耦合模型研究

doi:10.13722/j.cnki.jrme.2019.0491

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摘要预应力锚索在膨胀土地层中的锚固效果受地层含水率影响较大，且锚索预应力损失与土体应力松弛之间关系紧密。据此，以四川成都地区膨胀土为研究对象，通过室内模型试验研究4种不同含水率下膨胀土地层锚索预应力的损失规律；并针对膨胀土独特的黏弹塑性力学特征，建立基于应变相等的膨胀土–锚索耦合效应计算模型，得出耦合模型的本构方程和松弛方程，并与模型试验进行对比论证。结果表明：锚索预应力的衰减大致可分为快速衰减、缓慢衰减和相对稳定3个阶段；锚索预应力的衰减速度和衰减幅度都随着膨胀土层初始含水率的增大而增加；膨胀土地层中锚索的初期预应力损失可达到总损失量的80%；耦合模型的计算结果与试验测试值基本一致，可对已知物理参数土层的锚索锚固效果进行评估。

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	李涛1
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	钱霄3

关键词 ：土力学, 膨胀土, 预应力损失, 耦合模型, 松弛效应

Abstract：Bolting effect of prestressed anchor cables in expansive soil layers is greatly affected by the water content of the stratum，and the prestress loss of the anchor cable is closely related to the stress relaxation of the soil. Taking the expansive soil in Chengdu area，Sichuan，as the research object，indoor model tests were performed to study the prestress loss law of pretressed anchor cables in the expansive soil layer with four different water contents. In terms of the unique viscoelastic-plastic mechanical characteristics of expansive soils，a strain-equalization calculation model of expansive soil-anchor coupling effect and the corresponding constitutive and relaxation equations were proposed. Comparison between the developed model and model test results also carried out. The results show that the prestress attenuation can be divided into rapid attenuation，slow attenuation and relative stabilization stages，and that the attenuation speed and amplitude of prestressed anchor cables increase with increasing the initial water content of the expansive soil layer. The initial prestress loss of the prestressed anchor cable in the expensive soil layer can reach up to 80% of the total prestress loss. The calculation results by the coupling model is basically consistent with the test data，which indicate that the model is capable to be used to evaluate the bolting effect of anchor cables in soil layers with known physical parameters.

Key words： soil mechanics')" href="#">

soil mechanics expansive soil prestress loss coupling model
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引用本文:

李涛1，蔡海波1，刘波1，2，罗兴浩1，钱霄3. 膨胀土地层锚索预应力损失与流变耦合模型研究[J]. 岩石力学与工程学报, 2020, 39(1): 147-155.
LI Tao1，CAI Haibo1，LIU Bo1，2，LUO Xinghao1，QIAN Xiao3. Study on prestress loss and rheological coupling model of anchor cables in expansive soil layers#br#. , 2020, 39(1): 147-155.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0491 或 http://www.rockmech.org/CN/Y2020/V39/I1/147

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