巷道支护理论的研究

Theoretical research on roadway supporting

本文分析了巷道围岩稳定的条件、支架的支护对象和支护的作用。提出巷道支护作用分为“限制”作用与“稳定”作用两部分,其中支架的“限制”作用力参与围岩塑性区和破碎区的形成,控制其范围的大小,而“稳定”作用力则是使已经形成的塑性区、破碎区岩石重新得以稳定。阐述了新的巷道支护设计原理,推导出了理想弹塑性软化岩石力学模型下圆形巷道合理支护阻力计算表达式。

Analysing the stabilizing condition ofrocks surrounding a roadway and the ob-ject and effect of supports, the paper sug-gests that the effect of supports mny be di-vided into two parts, 'restrictional' andstabilizational', wherein the restrictingforce of supports takes part in the forma-tion of plastic zone and broken zone of thesurrounding rock and restricts their size,while the stabilizing force makes the rockin the above mentioned zone inrestabilization. The paper makes an exposi-tion of design principle of roadway supportand infers an expression for calculating thereasonable support resistance in a roundroadway under the condition of a mechan-ical model of ideal elasto-plastically soft-ened rock.