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采用三维显式有限差分法(FLAC3D)对隧道式复合锚碇中岩锚、锚塞体单独作用下及整体共同作用下的承载特性进行了数值模拟试验,分析了受力体系在不同主缆拉力及不同岩锚预应力工况条件下,岩体的变形和应力响应特征。结果表明:岩锚及锚塞体单独作用下均能满足悬索桥的受力及稳定性要求,合理的岩锚初始预应力值有利于隧道式锚碇的受力分配及承力时机,岩锚和锚塞体的系统刚度匹配决定了隧道式复合锚碇的极限承载比例分配,分析结果对隧道式锚碇的设计提供了依据。
The three-dimensional explicit finite difference method (FLAC3D) was used to simulate the bearing behavior under the combined effect of rock anchor and anchor plug in the tunnel-type composite anchor 碇. And different rock anchor pre-stressing conditions, the deformation and stress response characteristics of rock mass. The results show that both the rock anchor and the anchor plug body can meet the requirements of the force and stability of the suspension bridge under single action. The reasonable prestress value of the rock anchor is favorable to the force distribution and bearing time of the tunnel anchor, The system stiffness matching of anchor plug determines the ultimate bearing ratio distribution of tunnel composite anchor. The analysis results provide the basis for the design of tunnel anchor.