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为了掌握锚杆受力演变规律,为确定锚固参数提供依据,对锚杆受力演化机理进行了探讨.提出了锚固体第1、第2临界变形概念;揭示了锚杆轴向锚固力随着锚固体变形而演变的三阶段特征,即锚固力强化变形阶段、锚固力保持恒定的变形阶段和锚固力弱化变形阶段.变形小于第1临界变形时,锚固力随变形量而增强;变形量介于第1、第2临界变形之间时,随着变形增加整体锚固力保持最大而黏锚力分布发生转移;变形量大于第2临界变形后,锚固力随变形增加而衰减;第2临界变形量与锚固长度成正变关系,不同变形特征的巷道应采用不同的锚固长度,使锚杆在围岩变形过程中尽量保持在锚固力演变的第2阶段;提出了确定锚固长度时应考虑巷道变形量大小的观点.
In order to grasp the law of stress evolution of anchor rod and provide the basis for the determination of anchoring parameters, the mechanism of stress evolution of anchor rod was discussed. The concept of the first and second critical deformation of anchor was put forward. The three-phase characteristics of the evolution of the anchor deformation, that is, the stage of enhanced deformation of anchoring force, the stage of constant anchoring force deformation and the stage of weakening of anchoring force. When the deformation is less than the first critical deformation, the anchoring force increases with the deformation amount; When the deformation is greater than the second critical deformation, the anchoring force decays with the increase of deformation, and the second critical deformation of the second critical deformation The relationship between the amount and anchorage length has a positive relationship. The different deformation characteristics of the roadway should be used with different anchorage length, so that the anchor rod in the surrounding rock deformation process as far as possible to maintain the evolution of anchoring force in the second phase; proposed to determine the anchorage length should consider the deformation of the roadway The size of the point of view.