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[an error occurred while processing this directive]Seepage Characteristics of Damaged Rock Under Stress-Seepage Coupling
Received date: 2020-11-29
Revised date: 2021-03-08
Online published: 2021-07-14
During the mining of underground mineral resources,the deep hard rock will be damaged by the frequent stress disturbances.Its internal pores and fissures will rapidly expand and penetrate under the state of high ground stress and high osmotic pressure,which seriously threatens the safety and stability of rock mass engineering.The damage degree D is defined by the ratio of axial stress σ to compressive strength σ c.Pre-damaged rock samples with different damage degrees (0%,25%,40%,50%,65%,75%,100%) were prepared by uniaxial compression test.A series of stress-seepage coupling tests were carried out for 75% damaged granite.Combined with CT scanning,considering the influence of seepage pressure,confining pressure and damage degree,the mechanical and seepage characteristics of damaged rock under stress-seepage coupling was comprehensive analyzed.The research results show that with the increase of damage degree,the number and size of pore and fracture of rock sample increase significantly,and changes of the volume of pore and fracture of rock sample shows a trend of increase gently and increase steadily to increase sharply.Under the same confining pressure,the peak strength of the rock sample shows a linear decrease with the increase of osmotic pressure,the osmotic pressure has a significant weakening effect on the strength of damaged granite,and the degree of weakening is independent of the confining pressure.The permeability of pre-damaged rock samples is closely related to the volume of pores and fractures.The variation trend of permeability with damage percentage confirms the evolution law of pores in different development stages.The greater the degree of damage,the higher the degree of fracture development and the greater the permeability.At the same time,the permeability can be characterized by the degree of development of pores and fractures.With the same degree of fracture development,the greater the confining pressure,the smaller the permeability.
Jianhua HU , Zhezhe DONG , Shaowei MA , Yaguang QIN , Xiao XU , Zhuan Dai . Seepage Characteristics of Damaged Rock Under Stress-Seepage Coupling[J]. Gold Science and Technology, 2021 , 29(3) : 355 -363 . DOI: 10.11872/j.issn.1005-2518.2021.03.204
俄罗斯极地黄金公司估算其黄金储备约为2 950 t,为全球最大
据2021年5月21日报道,俄罗斯最大的黄金生产商极地黄金公司宣布了其根据JORC标准评估的资源储量结果。截至2020年12月31日,俄罗斯极地黄金公司探明的和控制的储量增加了71%,达到1.04亿盎司(约2 948.35 t)黄金,原因是大型金矿床苏霍伊洛克(Sukhoi Log)的储量纳入其中。
俄罗斯极地黄金公司的首席执行官在一份声明中表示,根据最新的资源储量评估结果,可以确认该公司目前拥有全球最大的黄金储备基地。
该公司计划于2022年对西伯利亚的苏霍伊洛克项目做出最终投资决定。截至2020年12月底,该公司测算控制的和推断的矿产资源量为2.04亿盎司(约5 783.30 t)黄金;而在2019年12月31日这一数字为1.88亿盎司(约5 329.71 t)。资源量增加的原因是在拟定新的采矿计划和资源模式后,对奥林匹克金矿床、布拉卡达特矿床、维尔宁矿床、库拉纳赫矿床和苏霍伊洛克矿床等进行了重新评估。
http://www.goldsci.ac.cn/article/2021/1005-2518/1005-2518-2021-29-3-355.shtml
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