两种含瓦斯煤样变形特性与抗压强度的实验分析

 介绍型煤煤样和原煤煤样的制作过程，设计含瓦斯煤样的三轴实验方法和步骤。利用自行研制的三轴蠕变瓦斯渗流装置和材料实验机组成含瓦斯煤样三轴压缩实验装置，对型煤煤样和原煤煤样进行含瓦斯三轴实验，获得大量不同围压和不同瓦斯压力条件下的实验数据；根据实验结果系统地研究含瓦斯煤样两种煤样在三轴应力条件下的变形特性和抗压强度。研究结果表明，围压和瓦斯压力对含瓦斯煤样的变形特性和抗压强度都有一定程度的影响；型煤煤样和原煤煤样的变形特性和抗压强度具有规律上的共性，但是其力学参数存在显著差异；弹性模量和泊松比在含瓦斯煤样的变形过程中不是定值，而是动态变化的，且2种煤样的弹性模量差别很大，泊松比也不相等；相同载荷条件下型煤煤样的变形比原煤煤样的要大得多，其形状改变也比原煤煤样的大。研究结果对进一步认识含瓦斯煤样的力学性质具有一定的意义。

TEST ANALYSIS OF DEFORMATION CHARACTERISTICS AND COMPRESSIVE STRENGTHS OF TWO TYPES OF COAL SPECIMENS CONTAINING GAS

A manufacturing process of coal briquette specimen(CBS) and raw coal specimen(RCS) is introduced；and then the method and steps of triaxial test for coal specimens containing gas(CSCG) are designed. By means of triaxial compressive experimental apparatus composed of a self-developed triaxial creep gas-seepage device and a material testing machine，the tests of CSCG are performed on CBS and RCS and a large number of test data under different confining pressures and gas pressure conditions are obtained；and the deformation characteristics and compressive strength of the two kinds of CSCGs are mainly investigated in triaxial stress conditions based on the experimental results. The results show that the confining pressure and gas pressure have a certain extent effect on the deformation characteristics and compressive strength of CSCG. The CBS and RCS have a commonness to some extent in deformation characteristics and compressive strength，but there are distinct differences between the mechanical parameters of the two kinds of coal specimens. The elastic modulus and Poisson¢s ratio are not constant but variable during the distorting of CSCG；and the elastic moduli of the two types of CSCGs are very different and their Poisson¢s ratios are also not equal actually；the deformation of CBS is much larger than that of RCS under a same loading condition，and in addition，the shape change of CBS is also larger than that of RCS. The results have a reference valuable for further exploring the mechanical properties of coal containing gas in future.