摘要
瓦斯存在严重威胁煤矿安全生产,低温冻融致裂技术是提高煤层渗透性,促进瓦斯高效开采的有效手段之一。本文主要研究低温冻融作用下煤样的力学特性,通过研究煤样的应力应变曲线和宏观破坏特征,得出结论:(1)煤样的破坏过程基本可以划分为裂隙闭合阶段、弹性阶段、裂隙发育阶段、破坏阶段;(2)随着冻融次数的增加,不同地区煤样的抗压强度呈现不同的降低趋势;(3)相同冻融次数下,冻融过程中最低温度越低,煤样的力学特性的劣化程度越严重。
The existence of gas seriously threatens the safety production of coal mines.Cryogenic freezing-thawing cycle is one of the effective means to improve the permeability of coal seam and promote efficient gas mining.The main content of this paper is the mechanical properties of coal samples after cryogenic freezing-thawing cycle.By studying the stress-strain curves and macroscopic failure characteristics of coal samples,it is concluded that:(1)it can be divided into fracture closure stage,elastic stage,fracture development stage and failure stage that failure process of coal;(2)with the increasing number of freezing-thawing cycles,the compressive strength of coal in different areas presents different decreasing trends;(3)in the case of one freezing-thawing cycle,the lower the minimum temperature in the freezing-thawing cycle,the more serious the deterioration degree of mechanical properties of coal samples.
作者
李康文
常文超
张艺昕
LI Kangwen;CHANG Wenchao;ZHANG Yixin(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing,100083 China)
出处
《科技创新导报》
2021年第33期32-35,共4页
Science and Technology Innovation Herald
关键词
冻融
单轴压缩
力学特征
破坏特征
Freeze-thaw
Uniaxial compression
Mechanical characteristics
Failure characteristics
