含水率对普朗铜矿自然崩落法覆盖层散体抗剪强度影响研究  

Study on the Effect of Moisture Content on the Shear Strength of the Overburden Covered by the Block Caving Method at Pulang Copper Mine

作　　者：文义明 牛向东 文瑶 程涌 聂琪 卢萍 WEN Yiming;NIU Xiangdong;WEN Yao;CHENG Yong;NIE Qi;LU Ping(Faculty of Metallurgy and Mining Engineering,Kunming Metallurgy College,Kunming 650033,Yunnan,China;Faculty of Public Security and Emergency Management,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Key Laboratory of Critical Minerals Metallogeny in Universities of Yunnan Province,School of Earth Sciences,Yunnan University,Kunming 650500,Yunnan,China)

机构地区：[1]昆明冶金高等专科学校冶金与矿业学院,云南昆明650033 [2]昆明理工大学公共安全与应急管理学院,云南昆明650093 [3]云南大学地球科学学院,云南省高校关键矿产成矿学重点实验室,云南昆明650500

出　　处：《矿产保护与利用》2024年第4期93-101,共9页Conservation and Utilization of Mineral Resources

基　　金：云南省科技厅科技计划项目(202401AT070047);云南省教育厅基金(2022J1304);昆明冶金高等专科学校科研基金(2022xjy23)。

摘　　要：覆盖层的物料特性是自然崩落法能否顺利进行的重要因素,普朗铜矿自然崩落法的覆盖层为高原冰碛物散体,其抗剪强度参数与含水率密切相关。以高海拔环境下的冰碛物为研究对象,采用散体直剪实验方法,获得不同含水率条件下的高原冰碛物散体抗剪强度参数,探索含水率对高原冰碛物散体抗剪强度参数的规律关系。研究结果表明:高原冰碛物散体物质的黏聚力和内摩擦角均随着含水率的增加而减小,黏聚力与含水率之间呈现较强的对数关系,而内摩擦角与含水率之间呈现较强的指数关系;根据冰碛物散体抗剪强度参数随含水率的变化程度,黏聚力对含水率的变化较为敏感,而内摩擦角对含水率的变化敏感性较低,说明黏聚力对含水率的敏感性要强于内摩擦角,含水率对高原冰碛物散体抗剪强度的影响主要是通过黏聚力变化来体现的。研究成果可为自然崩落法高原冰碛物覆盖层研究提供一定的理论依据。The material characteristics of the overburden layer is an important factor for the success of the natural caving method.The overburden of the natural caving mining method in Plan copper mine is a granular body of plateau moraine,whose shear strength parameters are closely related to moisture content.Based on the direct shear test method,the shear strength parameters of moraine at high altitude were obtained under different water content conditions,the relationship between moisture content and shear strength parameters of moraine debris was also discussed.The results were as follows:the cohesion and internal friction angle of plateau moraine particles decreased with the increase of moisture content.There was a strong logarithmic relationship between cohesion and moisture content,and an exponential relationship between internal friction angle and moisture content.Based on the law of variation between shear strength parameters and water content of moraine,cohesion was more sensitive to the change of water content,while internal friction angle was less sensitive to the change of water content.The results showed that the sensitivity of cohesion to water content was stronger than that of internal friction angle.The effect of moisture content on the shear strength of moraine debris was mainly reflected by the change of cohesion.The research results in this paper can provide some theoretical basis for the study of glacial till cover layers in high−altitude areas.

关 键 词：自然崩落法 含水率 冰碛物散体 抗剪强度 黏聚力 内摩擦角 

分 类 号：TD853.36[矿业工程—金属矿开采]