【摘 要】
：
Double torsion specimens were applied to study the subcritical crack growth of flabby and intricate ore in Jinchuan Ⅲ Mine. The relation between the subcritica
【机 构】
：
School of Resources and Safety Engineering
论文部分内容阅读
Double torsion specimens were applied to study the subcritical crack growth of flabby and intricate ore in Jinchuan Ⅲ Mine. The relation between the subcritical crack velocity v and the stress intensity factor KI is obtained, and the fracture toughness KIC and the lower limit of stress corrosion K0 are determined respectively. The results of test show that the curves of lgKI-lgv and KI-lgv can be well linear, and the high discretion of data are caused by mineral composition, particle size and mechanical property of rock itself. In addition, the subcritical crack growth with stress corrosion of the ore is caused by the united function of two mechanisms, one is the tensile stress and the other is the material at the crack tip. Chemical reaction takes place between the materials and the corrosion medium in the environment and makes the chemical bond break. So, the obtained results provide reliable for predicting the block caving velocity of the ore in Jinchuan Ⅲ Mine under high horizontal stress condition.
其他文献
The flow stress at elevated temperatures for magnesium alloy AZ31 was studied using isothermal compression testing. The effect of deformation parameters on the
Cathode meterial LiMn2O4 thin films were prepared by solution deposition followed by conventional thermal annealing (CTA) and rapid thermal annealing (RTA) usin
The Fe3O4 films were prepared by in-situ oxidative hydrolysis on chitosan. The structures and characteristics of the prepared Fe3O4 films were investigated by X
The effect of rare earths (RE) ranging from 0.1% to 1.2%(mass fraction) on hot cracking resistant property of Mg-Al alloys was investigated. The results show th
农产品安全问题关系到百姓能否吃得安心、吃得舒心、吃得放心。近日，江苏省泰州市质监、农委、史志档案办制定下发了《泰州市农产品质量安全建挡办法（试行）》（以下简称《办法》）。
工程机械液压系统的故障有80%与液压油污染有关。我公司针对叉车液压油污染问题进行了调查研究,并提出了预防污染措施,实施后取得了很好效果,下面进行简要介绍。1.污染原因和
Cathode material LiMn2O4 thin films were prepared through solution deposition followed by rapid thermal annealing. The phase identification and surface morpholo
Ribbons of amorphous Cu-Ti-Ni alloys were prepared by the melt spinning method. The amorphous structure of these ribbons was confirmed by X-ray diffractametry a
目前,建筑节能成为我国可持续发展战略的一部分,社会对建筑节能的意识也在逐渐增强.建筑围护结构的节能是建筑节能的主要部分,而通风双层玻璃幕墙是提高现代建筑围护结构节能
船渡南湖卷赤飚，冲天烈焰九州烧。三山划却丹华碧，红雨随心弄海潮。雷奔禹甸赤旗飘，凤翥龙翔颂海潮。有幸江山崇舵手，三声柳笛上云霄。万重红紫拥京华，焰火干霄入彩霞。朗朗乾坤生