Most of the surrounding rocks of offshore liquefied petroleum gas (LPG) reservoirs occur in jointed rock mass. This paper is aimed at the reinforcement of the layered composite rock masses. First, the structural mechanical model of the elastic deformation and completely plastic deformation for the bolt was constructed. Then, the equations of axial force, shear force, and bending moment in the cross section of the bolt were obtained by the force‐method canonical equation. The shear‐slip resistance effect of the bolt was decomposed into the friction effect and the dowel effect. In addition, the quantitative relationship between shear resistance and the characteristic angles (anchoring angle, friction angle, dilatancy angle, and deflection angle) and the geometrical and physical parameters of the bolt were derived. Finally, the influence of each characteristic angle on the mechanical properties of the bolt was analyzed in details and the model was verified. The analysis results showed that the laterally constrained load of the rock stratum on the bolt can be characterized by a power function, but the optimal power should be no less than 10. The dominant position of either the friction effect or the dowel effect was changed with the matching of different characteristic angles. The increase of the friction angle and dilatancy angle of the joint surface of the rock is beneficial to improve the lateral shear resistance of the bolt. The effect of the deflection angle on the lateral shear resistance of the bolt was affected by the anchoring angle. The optimal anchoring angle of the bolt should be in the range of 50°‐60°. The results in this study have important theoretical significance to guide the offshore anchoring engineering of layered composite rock masses.

中文翻译：

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液化石油气地下储藏节理岩体与锚杆耦合模型

海上液化石油气（LPG）储层的大部分围岩都存在于节理岩体中。本文旨在对层状复合岩体进行加固。首先，建立了螺栓的弹性变形和完全塑性变形的结构力学模型。然后，通过力法典范方程得出螺栓横截面的轴向力，剪切力和弯矩方程。螺栓的抗剪切滑移效应被分解为摩擦效应和销钉效应。此外，推导了抗剪强度与特征角（锚固角，摩擦角，剪胀角和偏转角）以及螺栓的几何和物理参数之间的定量关系。最后，详细分析了每个特征角对螺栓力学性能的影响，并验证了模型。分析结果表明，锚杆上岩层的侧向受约束载荷可以用幂函数来表征，但最佳功率应不小于10。不同特征角的匹配。岩石接合面的摩擦角和膨胀角的增大有利于提高锚杆的侧向抗剪强度。偏转角对螺栓的横向抗剪力的影响受锚固角的影响。螺栓的最佳锚固角度应在50°-60°的范围内。