某铜矿主矿、废石溜井双井效应研究

某铜矿矿石溜井自建成投入使用以来,断面由圆形变为不规则形状,尺寸由3 m变为超过20 m,最大面积接近300 m2,矿、废石井井壁由建成初期的距离25 m,到修复前距离约13 m,如果继续塌方将有垮通的危险,而根据矿山生产计划,该溜井还要有较长的服务年限。采用数值仿真的方法对溜井的稳定性进行了分析,对溜井垮塌过程相互影响机理做了研究。以莫尔-库伦强度准则为依据,重点分析围岩应力状态在sig3-sig1坐标平面内变化,得到了溜井在垮塌过程围岩应力变化规律,初步确定了目前溜井的运行状态,为进一步分析溜井稳定性和溜井支护、加固提供了依据。

Transient Intersubband Optical Absorption in Double Quantum Well Structure

The microscopic equations of motion including many-body effects are derived to study the intersubband polarization in the double quantum well structure induced by an ultrafast pumping infrared light. Based on the selfconsistent field theory, the transient probe absorption coefficient is calculated. These calculations are beyond the previous steady-state assumption. Transient probe absorption spectra are calculated under different pumping intensity and various pump probe delay.