摘要
对实例的回归分析与理论分析表明,应用矿柱强度公式σ_p=σ_(p1)(C+D·w/h)时,须区别矿柱材料以及矿层倾角θ。断裂力学证明,层状岩体及其所组成的矿柱,具有强度各向异性特征,体现在参数σ_(p1)(w/h=1时的矿柱强度)为倾角矽的函数。岩石材料的泊松效应,是矿柱强度σ_p与宽高比w/h成正相关的主要原因。不同材料的矿柱,因泊松比v值的不同而有不同的参数D值。层状岩石材料的视在泊松比v_(yx)是倾角θ的函数,决定了参数D值也与θ有关。
Statistical and theoretical analyses indicate that the difference in pillar material and ore bed inclination must be taken into consideration when applying the pillar strength formula σ_P=σ_(P1)(C+D·w/h) in pillar design.Fracture machanics studies have showed that layered rock masses and pillars formed by such rock masses are characterized by their anisotropy in strength which is manifested by the dependence of the parameter σ_(P1)(pillar strength when w/h=1) on the ore bed inclination θ.The Poisson's effect of rock materials is the main reason why the pillar strength σ_P is positively correlated to the width-to-height ratio w/h of pillars. Pillars of different materials have different values of the parameter D because of their difference in Poisson's ratio v. The apparent Poisson's ratio v_(yz) is a function of the ore bed inclinatoin θ and therefore the parameter D in the pillar strength formula is also dependent on θ.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
1993年第1期38-45,共8页
Chinese Journal of Rock Mechanics and Engineering
关键词
矿柱
强度
断裂
力学
影响因素
pillar strength, fracture mechanics, anisotropy, Poission's effect, ore bed inclination
