摘要
考虑岩体的流变特性,运用弹性--黏弹性对应准则及Laplace数值逆变换对矿柱支撑的采空区顶板岩层变形进行了分析,建立了采空区顶板挠度随时间的变化关系,揭示了采空区顶板位移随时间变化的特性.研究表明,在考虑岩体流变性质的情况下,采空区顶板下沉位移随时间延长而增大,在给定比较长的时间跨度,即使坚硬岩体顶板位移仍会达到相当大的量值,进而引起采空区顶板破断.通过对邢台石膏矿塌陷案例分析,验证了计算方法的可行性.
The deformation of roof strata supported by pillars in mined out area was analyzed in consideration of the rheological properties of rock masses and by utilizing the elastic-viscoelastic correspondence principle and numerical Laplace inversion. The roof deflection as a function of time was established, based on which the time-dependent behavior of the roof displacement was elaborated. It is shown that when rock creep properties are taken into account for both the pillars and roof, the roof displacement increases with pro- longing time as expected. Therefore, given a sufficient period of time, the roof deformation can reach a considerable magnitude even for hard rock masses and eventually lead to the collapse of roof strata. As a case, the estimation of failure time was carried out for Xingtai Gypsum Mine in China, in which the feasibility of the proposed method was verified by acceptable agreement between the estimated data and actual field observations.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2011年第2期142-148,共7页
Journal of University of Science and Technology Beijing
基金
国家高技术研究发展计划资助项目(No.2008AA062104)
国家重点基础研究发展计划资助项目(No.2010CB731500)
关键词
矿业工程
顶板控制
岩石力学
蠕变
数学模型
mining engineering
mine roof control
rock mechanics
creep
mathematical models
