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从事岩层控制的采矿工程师们对采用非破坏性试验法估测岩石强度很感兴趣。非破坏法预测岩石强度普遍采用回弹硬度试验法,在这种试验方法中,岩石的抗压强度仅仅与岩石的表面硬度有关,所以该法的准确性不很高。为了提高施米德特回弹法的准确性,建议将回弹指数与岩石的脉冲速度或比重结合使用,回弹指数与岩石比重结合测定岩石强度的准确性也可用回归分析进行评价。1 前言 采用非破坏性试验方法预测岩石单向抗压强度σ_c时,岩石的物理性质P与强度之间的关系σ_c=f(P)通常不是单纯对应关系,这是因为P还与其它因素有关(如岩石的化学成份和矿物成份,岩石结构的各向异性,孔隙率,比重,湿度等)。这些因素可由α1表示,其关系式如下: σ_c=f_1(α_1,α_2……α_n)(1) 而P的值可由下式给出 P=f_2(α_1,α_2……α_n;β_1,β_2,β_3……β_n)(2) 式中β_1表示与岩石强度有关的外在因素的变量,如不规则裂
Mining engineers engaged in formation control are interested in estimating rock strength using non-destructive testing. Non-destructive method to predict the rock strength commonly used rebound hardness test method, in this test method, the rock compressive strength is only related to the rock surface hardness, so the accuracy of the method is not very high. In order to improve the accuracy of the Schmidt rebound method, it is suggested to combine the rebound index with the pulse velocity or specific gravity of the rock. The accuracy of combining the rebound index with the rock gravity to determine the rock strength can also be evaluated by regression analysis. 1 Preface Non-destructive test method to predict the rock unidirectional compressive strength σ_c, the physical properties of rock P and the relationship between strength σ_c = f (P) is usually not a simple correspondence, this is because P is also related to other factors (Such as rock chemical composition and mineral composition, anisotropy of rock structure, porosity, specific gravity, humidity, etc.). These factors can be represented by α1 as follows: σ_c = f_1 (α_1, α_2 ... α_n) (1) and the value of P is given by P = f_2 (α_1, α_2 ... α_n; β_1, β_2, β_3 ... β_n) (2) where β_1 represents the variables of external factors related to rock strength, such as irregular cracks