摘要
为了研究矿壁在复杂荷载作用下的稳定性,根据矿壁-充填体的联合承载机理,并基于受纵横荷载共同作用的弹性薄板小挠度弯曲理论,建立矿壁稳定性分析模型。将模型运用于冬瓜山铜矿54线隔离矿柱采场矿壁稳定性分析,分析结果与实际工程探测情况一致,验证了模型在工程中的实用性和可靠性;研究充填体弹性模量E2、黏聚力c和矿壁结构参数对矿壁内部极限应力的影响,以及矿壁临界宽度随壁面尺寸和充填体力学参数的变化规律。研究表明:随着E2增大,σmax与σmin均逐渐增大,随着c增大,σmax减小,σmin增大;随着长高比值由小增大,矿壁从趋向于受拉破坏转变为趋向于受压破坏,临界宽度由主要受长度控制过渡为主要受高度控制;临界宽度随c增大而迅速减小,随E2增大而缓慢增大。研究结论为冬瓜山铜矿及类似开采条件的矿山提供了隔离矿柱开采设计优化的新方法、新思路。
In order to study the stability of the ore wall under complex loads,according to the joint bearing mechanism of the ore-filling body and the theory of small deflection bending of the elastic thin plate subjected to the longitudinal and transverse loads,stability analysis model of the ore wall has been established.And the model has been applied to the stability analysis of the 54-line isolated pillar of the Dongguashan Copper Mine.The analysis results have been consistent with the actual engineering detection.The applicability and reliability of the model in the project has been verified.The effects of the elastic modulus E2,the cohesion c and the structural parameters of the ore wall on the internal limit stress of the ore wall,and the law of the critical width of the ore wall with respect to wall size and mechanical parameters of the filling body have been studied.The results have shown that with the increase of E2,bothσmax andσmin increase gradually;as c increases,σmax decreases andσmin increases;as the aspect ratio increases,the ore wall changes from the tendency toward tensile failure to the tendency toward compressive failure,and the critical width transitions from being mainly controlled by the length to being mainly controlled by the height;the critical width decreases rapidly with the increase of c,and increases slowly with the increase of E2.The research conclusion provides a new method and new idea for the design optimization of isolated pillar mining for the Dongguashan copper mine and mines with similar mining conditions.
作者
谢学斌
李德玄
孔令燕
XIE Xuebin;LI Dexuan;KONG Lingyan(School of Resources and Safety Engineering,Central South University,Changsha,Hunan 410083,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2020年第4期698-706,共9页
Journal of Mining & Safety Engineering
基金
中央高校基本科研业务费专项资金项目(2018zzts715)
关键词
薄板理论
矿壁
复杂荷载
系统稳定性
联合承载
临界宽度
设计优化
thin plate theory
ore wall
multidirectional load
system stability
joint bearing
critical width
design optimization
作者简介
谢学斌(1968—),男,湖南省长沙市人,博士,教授,主要从事岩土工程、采矿工程、安全工程方面的研究。E-mail:912035278@qq.com,Tel:13117314357
