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本文第一部分讨论了隧洞粘弹-塑性围岩中应力和位移公式的推导。围岩位移区分为塑性位移和蠕变位移。在推演过程中,粘弹性区采用鲍埃丁—汤姆逊模型;塑性区采用了莫尔—库仑塑性准则。 第二部分研究了锚杆和喷混凝土的设计方法。对锚杆的作用作了如下分析:其一,锚杆通过受拉对围岩壁提供附加支护抗力;其二,通过受剪提高围岩的c、φ值。由此导出了锚杆作用下洞壁支护抗力P,与塑性区半径R_(?)~b的关系式。
The first part of this paper discusses the derivation of the stress and displacement formulas for the tunnel viscoelastic-plastic surrounding rock. Surrounding rock displacement is divided into plastic displacement and creep displacement. In the process of derivation, the Baladin-Thomson model was used in the viscoelastic region, and the Mohr-Coulomb plasticity criterion was used in the plastic area. The second part studies the design method of bolts and shotcrete. The effect of the bolt was analyzed as follows: First, the bolt provided additional support resistance to the surrounding rock wall through tension; second, the c and φ values of the surrounding rock were increased by shearing. Based on this, the relationship between the supporting force P and the radius R_(?)~b of the plastic zone is derived.