Series No．468June一2015一一一一一一一一一一一一一一一金一一属一一矿一一山METAL MINE 一一一一一一一一一一一一一一一
总第468期
2015年第6期
收稿日期一2015-02-24
作者简介一张树东(1982 ),男,工程师,硕士研究生三
研山铁矿边坡稳定性影响因素分析及控制技术
张树东1,2
(1.华北理工大学矿业工程学院,河北唐山063009;2.河北钢铁集团矿业公司司家营研山铁矿,河北唐山063700)摘一要一露天边坡的稳定是决定矿山安全生产的关键因素三基于研山铁矿边坡工程地质特征现场调查结果,得出边坡岩性二水以及开采扰动是影响矿区边坡稳定性的三大主要因素三综合考虑边坡岩土体破碎情况将边坡自西向东划分为3个分区,根据各区边坡实际状况,分别采用了全长黏结锚杆支护二预应力锚索二挂网喷射混凝土等防护治理措施三基于预裂爆破技术原理,对研山铁矿进行了预裂爆破参数设计及现场试验,结果表明,设计的爆破参数不仅大幅度降低了爆破震动,减小了对台阶损伤破坏,极大地增强了边坡的稳定性,为矿山安全生产奠定了基础三关键词一露天矿边坡一边坡稳定性一边坡加固一预裂爆破
一一中图分类号一TD854.6一一一文献标志码一A一一一文章编号一1001-1250(2015)-06-139-05
Affecting Factor Analysis and Control Technique of Open-pit Slope Stability in Sijiaying Iron Mine
Zhang Shudong 1,2
(1.College of Mining Engineering ,North China University of Science and Technology ,Tangshan 063009,China
2.Shijiaying Yanshan Iron mine ,Hebei Iron Steel Group Mining Company ,Tangshan 063700,China )
Abstract 一The stability of open pit slope is the key factor affecting the mine production security.Based on the results of
field investigation,it shows that slope lithology,water,and mining disturbance are the main three factors affecting the stability of Mine.The slope is divided to three areas by comprehensively considering the slope stability of rock and earth mass and the re-inforcement measures of whole-length bonding bolt,anchor wire technology,steel mesh +spray anchor net are taken to strengthen the slope stability.Based on the actual situation of the slope,some treatment measures are taken,such as full-length grouted bolt,pre-stressed cable,hanging shotcrete.Based on the pre-blasting technology theory,the pre-blasting parameter of the Yans-han Iron Mine was designed and brought into the field operations.The results show that the parameters greatly reduced blasting vibration and damage to the slope step,and then significantly improve the slope stability.The research lays a good foundation
for the safety production of the mine.
Keywords 一Open-pit slope,Slope stability,Slope reinforcement,Pre-splitting blasting
一一露天边坡的稳定性是影响矿山能否安全生产的重要因素,也是矿山地质环境保护对象三影响边坡的稳定性的影响因素主要可以分为主观因素和客观因素两大类三主观因素包括边坡角度设计大小二开采扰动以及人为破坏;客观因素主要包括边坡体的岩性如矿物组成二成分类型二以及边坡的地质构造如断层二节理等[1-2]三河北钢铁集团下属的研山铁矿边坡上部主
要为黏土和碎石的混合散体,具有风化易崩解二遇水易泥化等特点,矿山在正常开采过程中,采场东北帮的不同部位均出现失稳破坏三针对以上工程实际情况,对研山铁矿露天边坡失稳破坏的影响因素进行分析,并结合矿山条件提出有效治理措施三
1一工程概况
研山铁矿Ⅰ采场东北边帮坡顶为采场+30m 永久固定公路,公路下方边帮目前已开挖到6~18m 水平,由于揭露出的台阶边坡岩体节理裂隙发育二风化破碎,且台阶上部有第四系残坡积覆盖层,受风化二雨水冲刷及开挖卸荷等不利因素影响,边坡部分坡体出现张裂滑塌破坏,导致现有台阶坡不能按设计靠界并段三由于岩体破碎带及雨水冲刷作用,现有边坡出现多处冲沟破坏,对坡顶固定公路的安全运营形成隐患三为保证采场边帮正常靠界二台阶安全稳定,保证下方生产台阶的正常推进,确保坡顶固定运输公路安全,对北帮6m 平台以上边坡进行了现场踏勘,分析
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