Modeling of grout crack of rockbolt grouted system

Modeling of grout crack of rockbolt grouted system
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岩栓灌浆体系灌浆裂缝模拟

DOI:
10.1016/j.ijmst.2014.11.005
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发表时间:
2015
影响因子:
11.8
通讯作者:
Chang Xu
Chang Xu
中科院分区:
工程技术1区
文献类型:
--
作者:
Zhu Changxing;Chang Xu

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本文对锚杆注浆系统的抗拔性能进行了数值研究。在锚杆注浆系统复杂的破坏模式中,注浆裂缝是一个值得关注的问题。采用三线性粘聚区模型(CZM)模拟锚杆-注浆界面的界面行为,对注浆材料采用塑性损伤模型。通过计算结果与试验观测结果的对比,验证了数值方法的可行性。数值结果表明,灌浆材料的裂缝可分为斜裂缝和水平裂缝两种。先形成斜裂纹,然后形成水平裂纹。这两种裂纹都会降低界面剪应力,从而降低载荷传递效率。进一步的分析表明,痛风材料的开裂会导致承载能力的明显下降,这不是一种安全的破坏模式。该研究有助于更好地理解锚杆注浆系统的作用机理。
This paper presents a numerical study on the pullout behavior of the rockbolt grouted system. Among the complicated failure modes of the rockbolt grouted system, the crack of the grout is concerned here. A tri-linear cohesive zone model (CZM) is used to simulate the interfacial behavior of rockbolt–grout interface; and a plastic damaged model is adopted for the grout materials. The feasibility of the numerical method is verified by comparing the calculated results with the test observations. The numerical results indicate that two types of cracks of the grout materials can be identified as the inclined crack and the horizontal crack. The inclined crack forms firstly and then the horizontal crack. Both cracks can reduce the interfacial shear stress and thus reduce the load transfer efficiency. Further analysis indicates that the crack of the gout material can induce the obvious drops of load capacity, which is not a safe failure mode. This study leads to a better understanding of the mechanism for rockbolt grouted system.
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