岩石冲击倾向性及其影响因素试验研究

发布时间：2018-03-05 00:18

本文选题：脆性指标修正值　切入点：屈服度　出处：《河南理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：岩石的冲击倾向性(或称岩爆倾向性)是影响煤矿冲击地压和岩爆的主要因素之一,而且是岩石力学界需要研究解决的科学难题。本论文以岩石冲击倾向性为研究对象,探讨了其在不同影响因素下的变化规律。对砂岩、石灰岩、泥岩进行单轴压缩试验,通过理论分析提出屈服度与屈服量的概念,计算出每个试样的冲击倾向性参数,发现BIM与屈服度关系良好,依据BIM对冲击性的评价标准,提出屈服度作为冲击性指标的评价标准;对花岗岩、灰岩、砂岩、大理岩分别进行干燥、泡水、不同围压、不同高径比的单轴压缩试验和常规三轴压缩试验得到全应力-应变曲线和基本物理力学参数,分析三种因素对岩石力学性质的影响,并采用五种强度准则对砂岩的强度与围压进行拟合,发现指数准则拟合效果更佳。对冲击倾向性研究,发现泡水后BIM和屈服度值升高、KE值降低,因此其冲击倾向性降低;而动态破坏时间并不能准确地表达冲击倾向性;围压可使BIM、屈服度值升高,KE值降低,从而降低了岩石的冲击倾向性;高径比越大,BIM、屈服量、屈服度均减小,冲击倾向性增大,而KE值增大。因此,随着高径比的增大,岩石冲击倾向性升高。综合研究结果,对煤、金属矿深井开采、地下工程的冲击地压及岩爆理论研究及防治具有一定的指导意义。
[Abstract]:Rock impact tendency (or rock burst tendency) is one of the main factors that affect the impact ground pressure and rock burst in coal mine, and it is also a scientific problem to be solved in rock mechanics. The uniaxial compression tests of sandstone, limestone and mudstone are carried out. The concepts of yield degree and yield quantity are put forward through theoretical analysis, and the impact tendency parameters of each sample are calculated. It is found that the relationship between BIM and yield is good. According to the evaluation standard of BIM for impact, the yield degree is put forward as the evaluation standard of impact, and the granites, limestone, sandstone and marble are dried, foamed with water and different confining pressures, respectively, for granite, limestone, sandstone and marble. The full stress-strain curves and basic physical and mechanical parameters are obtained by uniaxial compression tests and conventional triaxial compression tests with different height-diameter ratios. The effects of three factors on the mechanical properties of rock are analyzed. Five kinds of strength criteria are used to fit the strength and confining pressure of sandstone, and it is found that the exponential criterion is more effective. When the impact tendency is studied, it is found that the BIM and yield value increase and the value of yield decreases after bubble water, so the impact tendency decreases. But dynamic failure time can not accurately express impact tendency, confining pressure can make BIMs rise and yield value increase and Ke value decrease, thus reducing rock impact tendency, the higher the ratio of height to diameter is, the lower the yield and yield degree are, and the impact tendency is increased. Therefore, with the increase of the ratio of height to diameter, the rock impact tendency increases. The comprehensive research results have a certain guiding significance for the theoretical study and prevention of rock burst and rock burst in deep well mining of coal and metal mines and underground engineering.
【学位授予单位】：河南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD324

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