摘要
以大冶铁矿为工程背景,采用相似材料模型实验和数值模拟计算相结合的方法,对深凹露天转地下开采高陡边坡的变形和破坏规律进行了系统研究.首先,模型相似实验中,采用百分表、压力传感器和近景摄影测量等手段监测模型的应力应变和破坏特征,对围岩位移和破坏裂纹进行系统分析,揭示了高陡边坡的变形和破坏基本规律.其次,采用有限差分软件,从地表沉降量、应力值变化和塑性区分布等方面与相似材料实验结果进行了对比分析.结果表明,高边坡竖向最大沉降为28.2mm,围岩破坏程度随着开采深度的增加递增,塑性区范围不断扩大,剪切破坏主要集中在两侧边坡的边脚部位.相似模型实验和数值模拟相结合可以较好地揭示深凹露天转地下开采过程中高陡边坡的变形和破坏基本特征,是一种较好的理论研究方法.
The deformation and failure law of a high steep slope during transformation from deep open-pit to underground mining using similar material physical models and numerical simulation was researched with Daye Iron Mine as an example. The similar material physical model was monitored with stress sensors, dial-gauge displacement sensors, and close-range photogrammetry methods to obtain the failure and stress-strain characteristics. Systematic analysis was made on displacement and crack failure of surrounding rock to discover the basic deformation and failure law of the high steep slope. The stress distributions, surface subsidence, and plastic zones predicted by a finite-difference numerical model were compared with those measured from the similar material model experiment. The results indicate that the maximum vertical settlement of the high steep slope is 28.2 mm. The extent of damage and the plastic zone in- crease with the mining depth increasing. The shear failure of the rock mass mainly appears at the foot of the two sides slopes. The combination of similar modeling and numerical modeling is a good solution for research on the basic characteristics of rock mass deformation and failure of high-steep slopes during transformation from deep open-pit to underground mining.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第2期145-151,共7页
Journal of University of Science and Technology Beijing
基金
"十一五"国家科技支撑重大计划资助项目(No.2006BAB02A02)
关键词
地下开采
露天矿
高陡边坡
变形与破坏
模型实验
underground mining
open pit, steep slope
deformation and failure
model experiment
