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煤层冲击倾向性评价的新指标体系

时间:2022-03-14 08:17:53 浏览量:

材料峰值强度后的应力-应变曲线的变化趋势及残余强度特点,为评价煤层冲击倾向性奠定了理论基础。

2)基于损伤速率提出损伤加速度概念,并得到峰值强度点、损伤速率最值点、损伤加速度最值点处的应力、应变及损伤因子的表达式,进而获得可间接表征动态破坏时间的修正动态损伤应变,使冲击倾向性实验不再受加载方式的限制。

3)提出一种评价煤岩冲击倾向性的新指标-盈余能指数变化率指标,且将盈余能指数变化率、损伤速率最大值和修正后动态损伤应变构成冲击倾向性评价新的指标体系。利用冲击倾向性实验表明,新提出的冲击倾向性指标评价结果稳定可靠,能有效减小评价误差和降低实验工作量。

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第39卷 第5期 2019年9月

西安科技大学学报 JOURNAL OF XI’AN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Vol.39 No5 Sep2019

高明涛,辛恒奇,郭忠平,等.黄河北煤田薄煤层采场上覆岩层纵向分带发育规律[J].西安科技大学学报,2019,39(5):790-801.

GAO Ming-tao,XIN Heng-qi,GUO Zhong-ping,et al.Vertical zonation development of overlying strata in thin coal seam stope in Huangbei coal field[J].Journal of Xi’an University of Science and Technology,2019,39(5):790-801.

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