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地下工程锚固体接触界面的流变力学特性是锚固体产生时效性的重要因素。针对地下工程长期稳定性分析中常采用的锚固界面法向硬接触和切向黏结滑移突变常导致计算不收敛的困惑,建立了锚固界面法向刚度服从指数分布的软接触型式,并提出剪切面的非线性流变本构模型,解决了计算难以收敛的问题。该模型考虑了法向应力对剪切流变的影响,可以更真实地反映锚固界面流变的力学过程。将建立的锚固界面力学模型植入ABAQUS软件,并应用于地下工程的锚固时效性分析。研究成果表明:地下工程锚固界面产生的剪切流变导致锚杆应力增大,并使得预应力锚杆峰值的位置随着时间发生变化,且有向锚根转移的趋势。研究成果可为地下工程锚固的可靠性分析提供理论依据。
The rheological mechanical properties of underground engineering anchor contact interface is an important factor in the timeliness of anchor. In order to solve the problem that the normal hard contact and the tangential bond slip mutation often used in the long-term stability analysis of underground engineering lead to the confusion of calculation not convergent, the soft contact type with the normal stiffness of the anchoring interface subject to exponential distribution is established and the shear Surface nonlinear rheological constitutive model to solve the calculation difficult to converge the problem. The model considers the effect of normal stress on shear rheology and can reflect the mechanical process of rheological behavior at anchoring interface more faithfully. The mechanical model of the anchoring interface was built into the ABAQUS software and applied to the anchorage aging analysis of underground engineering. The research results show that the shearing rheology generated by the anchoring interface of underground engineering leads to the increase of stress on the anchor rod and the peak position of the prestressed anchor rod changes with time, and the tendency of the anchor root is shifted. The research results can provide a theoretical basis for the reliability analysis of anchoring in underground engineering.