金属矿山硐室发生岩爆的数学判据的研究

近年来,金属矿山发生岩爆的事故愈来愈多,对预测此类岩爆的发生也日益重要.通过对金属矿山岩爆的分析,建立了一种岩爆与临界深度有关的数学判据,以此来判别金属矿山硐室中是否有岩爆发生,并通过实例验证了其可行性,对有效预测预防金属矿山岩爆的发生具有一定的参考意义.     

一维六方准晶中直位错的弹性场

目的研究准晶中的位错弹性理论. 方法通过将位错分解为刃型和螺型分量,该位错引起的整个弹性场可由两个分量所引起的弹性场叠加得到. 结果与结论获得了平行于准周期轴的直位错的弹性场及两个平行的直螺型位错之间的广义Peach-Koehler力.     

Uniaxial tension and tensile creep behaviors of EPS

The mechanical behavior of EPS(Expanded polystyrene) with three densities at room temperature and under tension loading was studied.The results show that EPS material is characterized by brittle behavior in the tension tests,and tensile properties of EPS increase with the increase of density.Volume fraction has no a significant effect on the modulus of these foams.The tensile creep strain increases with stress for EPS with same density,indicating that the creep behavior is of the stress dependency.And the creep behavior of EPS exhibits density dependency,which the creep strain decreases with densities for a fixed stress value.Moreover the creep behavior under the constant tension load is well in coincidence with the three-parameter solid model.