地应力影响下钠长岩-片岩物理力学特征随赋存深度变化规律研究  

Variation of Physical and Mechanical Characteristics of Albitite and Schist with Occurrence Depth Based on In - situ Stress

作　　者：付俊 蔡君 郁华嘉 何名声 周罕 吴灿萍 FU Jun;CAI Jun;YU Hua-jia;HE Ming-sheng;ZHOU Han;WU Can-ping(Kunming Prospecting Design Institute of China Nonferrous Metals Industry Co.,Ltd.,Kunming 650051,China;Yunnan Key Laboratory of Geotechnical Engineering and Geohazards,Kunming 650051,China;Liangshan Mining Industry Co.,Ltd.,Huili 615141,China)

机构地区：[1]中国有色金属工业昆明勘察设计研究院有限公司,昆明650051 [2]云南省岩土工程与地质灾害重点实验室,昆明650051 [3]凉山矿业股份有限公司,会理615141

出　　处：《科学技术与工程》2024年第16期6674-6680,共7页Science Technology and Engineering

基　　金：云南省科技厅省重点实验室科技计划项目(科技人才与平台计划202105AG070006);四川省凉山州重点研发项目(22ZDYF0006);中国铝业集团有限公司科技人才“明星计划”培养对象项目(中铝人才字[2022]622-3号);中国有色金属工业昆明勘察设计研究院有限公司科技创新项目(2020YN10)。

摘　　要：以西南地区凉山州拉拉铜矿的钠长岩-片岩物理力学特征为研究对象,研究物理力学特征随赋存深度变化规律,在标高+1 890~1 760 m共开展54个点的工程地质调查工作,标高+1 880~1 760 m 10次地应力测试,并在标高+1 984~1 760 m进行钠长岩、片岩的岩块取样,完成岩样的物理性质、单轴抗压强度、单轴压缩变形试验,获取各标高岩样的密度、孔隙率、单轴抗压强度、弹性模量、泊松比及岩体的节理间距、地应力测试数据。结果表明:该矿山钠长岩和片岩的单轴抗压强度、弹性模量、密度及泊松比均随赋存深度增加而增加,孔隙率及节理间距随赋存深度增加而减小。随着岩石的赋存深度增加,地应力值随之增加,直接改变了岩石的应力环境,岩体节理间距的变化同时反映了应力环境的改变。这也引起岩石孔隙率、密度的改变,进而组成岩石的矿物颗粒受到挤压,导致岩石的结构逐渐致密,岩石力学强度特性提高。The physical and mechanical characteristics of albitite and schist in Lala Copper mine,Liangshan,southwest China were taken as the research object,the variation of physical and mechanical characteristics with occurrence depth was studied.54 engineering geological surveys were completed at elevations of+1890~1760 m,10 geostress tests were conducted at elevations of+1880~1760 m,and samples of albitite and schist were sampled at elevations of+1984~1760 m,and tests of physical properties,uniaxial compressive strength and uniaxial compression deformation of rock samples were completed.The density,porosity,uniaxial compressive strength,elastic modulus,Poisson's ratio of rock samples,joint spacing in-situ stress of rock mess of each elevation were obtained.The results show that the uniaxial compressive strength,elastic modulus,density and Poisson's ratio of albitic and schist increase with depth,porosity and joint spacing decrease with depth.With the increase of rock depth,the in-situ stress increases,which directly changes the stress environment of rock mass.The joint spacing of rock mass also reflects the change of stress environment.It also changes the porosity and density of rock mass.Then the mineral particles of the rock are squeezed,resulting in the gradual densification of the rock structure,and the improvement of the mechanical strength characteristics of rock.

关 键 词：赋存深度 物理力学特征 钠长岩 片岩 

分 类 号：TD862[矿业工程—金属矿开采]