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通过对永川煤矿砂岩物理力学性质的实验研究,得出了突出砂岩的特征,并据此研究了该矿-350m水平砂岩突出倾向性,提出了重力场条件下砂岩突出倾向性的判据.研究表明:突出的砂岩具有孔隙率大、气孔容积大的物理特征和杨氏模量较低、强度低、不易产生塑性变形的力学特性;岩石和瓦斯突出发动过程与冲击地压特征具有一致性,可以用研究冲击地压的理论来研究砂岩突出倾向性问题;砂岩突出受多种因素影响,力学因素是主导因素.在“三准则”理论基础上,建立了用能量准则、强度准则和冲击倾向性准则评价砂岩突出倾向性的方法.
Based on the experimental study of the physical and mechanical properties of the sandstone in Yongchuan coal mine, the characteristics of the prominent sandstone are obtained and the prominent tendency of the sandstone at -350m level is studied, and the criterion for the prominent tendency of the sandstone under the gravity field is proposed. The results show that: the prominent sandstone has the characteristics of large porosity, large pore volume and low mechanical properties such as low Young’s modulus, low strength and not easy to produce plastic deformation. The process of rock and gas outburst coincides with the characteristics of rockburst, We can study the salient tendency of sandstone by studying the theory of rockburst. The sandstone is dominated by many factors and the mechanical factors are the dominant factors. Based on the “three criteria” theory, the energy criterion, the strength criterion and Impact propensity criteria to evaluate the salient tendency of sandstone.