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对沁水煤田不同地区不同煤级的煤岩样品开展了同步升温和升压高温高压实验变形(温度200～500℃；围压200～500 MPa；应变速率0.5×10~(-5)/s；全量应变-10%)．实验结果显示,在不同的温度和压力条件下煤岩的强度有着显著的变化．对于煤岩强度的影响,温度的效应要高于压力的效应．结合显微构造分析可以认为,实验环境条件下煤岩的脆-韧性转变发育于200℃/200 MPa和300℃/300 MPa之间．煤岩的脆性变形产生了宏观破裂带和透入性破裂组合,而大量发育的波状消光、变形纹和动态重结晶颗粒等充分反映了较高温度和压力条件下晶质塑性变形过程的主导地位．
The coal samples of different coal rank in different areas of Qinshui coalfield were subjected to simultaneous high temperature and high pressure experimental deformation (temperature 200 ~ 500 ℃, confining pressure 200 ~ 500 MPa, strain rate 0.5 × 10 -5 / s ; Full strain -10%). Experimental results show that under different conditions of temperature and pressure, the strength of coal rock has a significant change. For coal rock strength, the temperature effect is higher than the pressure effect. Combined with the microstructure analysis, it can be concluded that the brittle-ductile transition of coal and rock develops at 200 ℃ / 200 MPa and 300 ℃ / 300 MPa under the experimental conditions. The brittle deformation of coal and rock has resulted in the combination of macroscopic rupture zone and perloclastic rupture. However, the extensive development of undulating matte, deformation grain and dynamic recrystallization grain fully reflects the dominance of the crystalline plastic deformation under higher temperature and pressure .