基于围岩弹塑性理论的立井井壁厚度设计研究

摘要

Based on current elastic-plastic theory,a mechanical plane strain model was established considering interaction between shaft lining and surrounding rock.Firstly,the applicable conditions of the mechanical model were studied,and the new thickness design formula of shaft lining was derived.Secondly,the mutual relations were discussed between the resistance of shaft lining,plastic zone and geometry of the shaft.Finally,influence on thickness design caused by shear modulus,friction angle,cohesion and other physical and mechanical parameters of surround rock were discussed,revealing the mechanism of interaction between shaft lining and the surround rock.%基于现有的弹塑性理论,建立了考虑井壁和围岩相互作用的平面应变力学模型.首先,研究了该力学模型的适用条件,推导出新的井壁厚度计算公式;其次,讨论了井壁支护抗力、塑性区范围和井筒几何尺寸的相互关系;最后,分别分析围岩的剪切模量、摩擦角和粘聚力等物理力学参数对井壁受力的影响,更深刻地揭示井壁和围岩相互作用的机理.