高应力下含水煤岩力学特性研究现状

Research Status of Mechanical Properties of Water-Bearing Coal Rock under High Stress

针对含水煤岩在高应力条件下的力学特性,从含水煤岩的力学特性、含水煤岩的本构方程等方面,对国内外具有代表性的相关研究进行梳理,同时对下一步研究进行展望。目前针对高应力条件下含水煤岩的研究现状指出,在高应力条件下煤岩的脆性破坏会向延性、塑性转变,同时煤岩材料在破坏时的扩容现象将会消失。煤岩的强度会随着含水率的增加而降低。针对含水煤岩的损伤机理的研究,多数研究都集中在水因子对煤岩强度参数、变形参数的影响,忽视了在压缩过程中煤岩内部孔隙水压力对煤岩破坏机理的影响,针对含水煤岩的损伤破坏机制研究还较少。

In view of the mechanical properties of water-bearing coal rock under high stress conditions, the representative relevant researches at home and abroad are sorted out from the mechanical properties of water-bearing coal rock and the constitutive equation of water-bearing coal rock, and the future research is prospected. At present, according to the research status of water-bearing coal rock under high stress condition, it is pointed out that under high stress condition, the brittle failure of coal rock will change to ductility and plasticity, and the dilatancy phenomenon of coal rock material during failure will disappear. The strength of coal and rock decreases with the increase of water content. Most of the researches on the damage mechanism of water-bearing coal and rock focus on the influence of water factor on the strength and deformation parameters of coal and rock, and ignore the influence of pore water pressure inside coal and rock on the failure mechanism of coal and rock during the compression process. There are few researches on the damage and failure mechanism of water-bearing coal and rock.