研山铁矿风化岩体边坡稳定性分析及综合加固

详细信息    查看全文 | 推荐本文 |

英文篇名：Stability Analysis and Synthetic Reinforcement of Weathered Rock Mass Slope in Yanshan Iron Mine 作者：张树东 英文作者：Zhang Shudong;Sijiaying Yanshan Iron Mine Co.,Ltd.,Hebei Iron & Steel Group; 关键词：风化岩体 ; 边坡稳定性 ; 滑坡 ; 锚索格构梁 ; 综合加固 英文关键词：Weathered rock mass;;Slope stability;;Landslide;;Cable-stiffened latticed beam;;Synthetic reinforcement 中文刊名：KYKB 英文刊名：Modern Mining 机构：河北钢铁集团司家营研山铁矿有限公司; 出版日期：2018-12-25 出版单位：现代矿业 年：2018 期：v.34;No.596 语种：中文; 页：KYKB201812057 页数：5 CN：12 ISSN：34-1308/TD 分类号：198-201+204

摘要

为了治理研山铁矿东帮N26线风化岩体边坡的滑坡区域,通过识别地质灾害体特征及滑坡诱发因素,发现第四系、强风化黑云变粒岩及白云母片岩等低强度、强风化层位失稳破坏是诱发滑坡的主要因素,边坡结构面与边坡倾向一致、河水涌入、爆破震动、人工开挖等加剧了灾害发生。通过边坡稳定安全系数验算,发现治理前边坡安全系数无法满足安全要求,治理后滑坡区域抗滑安全系数需达1. 22。在此基础上,提出以锚索格构梁为核心,采用危岩清理、边坡内部放水孔和地表截排水沟等措施的边坡综合加固技术。现场治理结果表明,治理15个月后,预应力锚索的锚固体强度损失小于14%,岩质边坡抗滑安全系数为1. 264,边坡岩体内部基本无积水,风化岩体区域的滑坡得到有效治理。
        In order to manage the landslide at N26 area of eastern weathered slope in Yanshan Iron Mine,geological hazard characteristics and landslide inducing factors are analyzed. The results show that the main influence factor is the instability of low strength and strength weathering strata,which lithology is mainly for Quaternary,strongly weathered biotite granulite and dolomite schist,the slope structure plane is consistence to slope tendency,the landslide disaster is caused by river inflow,blasting vibration and artificial excavation. Through the calculation of safety coefficient of slope stability,which show that the slope safety coefficient before governance can not meet the safety requirements,the safety coefficient in landslide area should be reached to 1. 22. Based on the above discussion results,the slope synthetic reinforcement technique based on dangerous rock cleaning,slope internal drainage holes and surface drainage intercepts is proposed,besides that synthetic reinforcement technique is mainly composed of cable-stiffened latticed beam. The actual practice results indicated that the loss rate of anchor strength of pre-stressed anchor cable is lower than 14%,anti-slide stability coefficient of rock mass slope is 1. 264,there is basically no water accumulation inside the rock mass slope,the landslide in weathered rock mass area is effectively controlled.

引文

[1]关晓锋,李如忠,黄佳强,等.中国露天铁矿开采发展趋势展望[J].现代矿业,2012(6):53-55.
    [2] HASSAN B,HANI M. Application of rock mass classification systems to rock slope stability assessment:A case study[J]. Journal of Rock Mechanics and Geotechnical Engineering,2017,9(6):993-1009.
    [3]姚颖康,周传波,郭廖武,等.深凹露天矿山岩质高陡边坡稳定性预测[J].金属矿山,2008,38(3):42-45.
    [4] HAN XUE,HE MANCHAO,ZHANG BIN. Sensitivity analysis for parameters of a monitoring system for steep slopes of open-pit mines[J]. Mining Science and Technology(China),2009,19(4):441-445.
    [5]韩斌,仪海豹,郑禄璟,等.低强度易风化破碎露天边坡综合加固与排水技术[J].金属矿山,2013,43(3):14-17.
    [6]牟春梅,邱建国,何永超,等.预应力锚索格构梁与锚索抗滑桩在滑坡治理中的比选分析[J].路基工程,2014(4):28-32.
    [7]张树东.研山铁矿边坡稳定性影响因素分析及控制技术[J].金属矿山,2015(6):139-143.