关键词: 西部浅埋煤层, 饱水, 高温处理, 高径比, 冲击倾向

Abstract: Shallow buried depth, thick coal seam and narrow coal pillar are typical occurrence characteristics of western shallow-buried coal seam in China．The uniaxial compression test of coal samples in water-saturated and air-dried conditions, in four temperature levels between 25 ℃ and 250 ℃, and of three different kinds of ratio of height to diameter has been conducted respectively in order to investigate the influence law of temperature, water, and dimension on the bearing capacity and burst proneness of coal samples from western shallow-buried coal seam．The results show that: 1) From natural state-water saturation-seasoned state, peak strength and the modulus of coal samples decrease sharply while the peak strain increases gradually．The damage extent becomes more and more severe while the burst proneness weakens. 2) With the gradual increase of the temperature, peak strength, peak strain and the modulus of coal samples all first increase then decrease, and all arise the critical point when the temperature is 100 ℃, at this time burst proneness of coal samples aggravates with severe splashing during the loading process．However, both the bearing capacity and burst proneness weaken gradually as the temperature continues to rise to 250 ℃. 3) With the increase of the ratio of height to diameter, peak strength, peak strain and the modulus of coal samples all show the attenuation trend．Deformation and the damage extent weaken while the burst proneness strengthens.

Key words: western shallow-buried coal seam, saturation, high temperature treatment, the ratio of height to diameter, burst proneness