Coupling Analysis for Rock Mass Supported with CMC or CFC Rockbolts Based on Viscoelastic Method
Coupling Analysis for Rock Mass Supported with CMC or CFC Rockbolts Based on Viscoelastic Method
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DOI：
10.1007/s00603-019-01840-6
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发表时间：
2019-11-01
影响因子：
6.2
通讯作者：
Wang, Ke
中科院分区：
文献类型：
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作者：
Wang, Gang;Han, Wei;Wang, Ke
在采矿和土木工程的高应力条件下，锚杆已被广泛应用于岩石加固。然而，锚杆与围岩之间的相互作用机理尚不清楚。为了全面了解锚杆支护岩体的耦合机理，本文研究了连续力学耦合(CMC)和连续摩擦耦合(CFC)锚杆支撑的岩体的耦合效应和时变特性。在耦合状态下，得到了相互作用模型的弹性解。此外，采用粘弹性解析解来描述耦合模型的流变特性，并将锚杆和岩体的本构模型设置为基于材料特性的一维Kelvin模型和三维Maxwell模型，从而得到了解。根据所提出的耦合模型，岩体的应力场和位移场以及锚杆的轴向力强烈地依赖于岩体和锚杆的相对变形模数。此外，锚杆或岩体的粘性系数越小，产生的岩体位移越大。此外，随着相对变形模数的增加，到锚杆端部外中性点的距离也增大。此外，中性点的位置与时间无关。
Rockbolts have been widely used in rock reinforcement for high-stress conditions in mining and civil engineering. However, the interaction mechanism between the rockbolt and the rock mass is still unclear. To fully understand the coupling mechanism of a rock mass supported with rockbolts, this article studied the coupling effect and the time-dependent behavior of a rock mass supported with continuously mechanically coupled (CMC) or continuously frictionally coupled (CFC) rockbolts. The elastic solutions of the interaction model were obtained in the coupled state. In addition, viscoelastic analytical solutions were used to describe the rheological properties of the coupling model, and the solutions were acquired by setting the constitutive models of the rockbolt and rock mass to a one-dimensional Kelvin model and a three-dimensional Maxwell model based on the material properties. According to the proposed coupling model, the rock mass stress and displacement fields, and the rockbolt axial force strongly depend on the relative deformation modulus of the rock mass and rockbolt. In addition, a lower viscosity coefficient of the rockbolt or rock mass produces a larger rock mass displacement. Moreover, as the relative deformation modulus increases, the distance to the neutral point beyond the rockbolt head increases. Furthermore, the position of the neutral point is independent of time.