期刊论文

Experimental Investigation on Strength and Size Effect of the Gypsum Sample in Different Height to Diameter Ratios

中文

地下空间与工程学报

1673-0836

2016

12

6

1464-1470

51374129:国家自然科学基金 :南华大学校级创新团队项目

本校为第一机构

确定合理的矿柱尺寸及其强度是保障石膏矿安全生产与长期稳定的关键因素。采用RMT-150B岩石力学试验机,对不同高径比石膏试样进行了单轴压缩试验。利用力学试验结果,建立了石膏试样强度与尺寸效应的理论模型及其表达式,采用FLAC~(3D)模拟了不同高跨比石膏矿柱的承载能力。研究结果表明:石膏试样的峰值应力、残余强度、弹性模量随高径比的减小而增大;初始应力和峰值应力所对应的轴向应变和横向应变随高径比的减小而减小;峰值应力后的轴向应变随高径比的减小而急剧减小,而横向应变则与之相反,且高径比越小横向应变越容易产生扩容破坏,呈现出软岩特性;变形模量与高径比之间的关系不明显,不能用其表...

Determining reasonable pillar parameters and strength are the key factor to ensure the gypsum mine safety production and long term stabilization. The uniaxial compressive tests of gypsum samples in different height to diameter ratios were measured by RMT-150B rock mechanics testing machine. Based on the test results,a theoretical model and an expression of strength and size effect of gypsum sample were established. In addition,the bearing capacity of gypsum samples in different height to diameter ratios were simulated by FLAC~(3D). The results show: The peak stress,residual strength and elasti...