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.
作者
张树东
Zhang Shudong(Sijiaying Yanshan Iron Mine Co., Ltd., Hebei Iron & Steel Group)
出处
《现代矿业》
CAS
2018年第12期190-193,196,共5页
Modern Mining
关键词
风化岩体
边坡稳定性
滑坡
锚索格构梁
综合加固
Weathered rock mass
Slope stability
Landslide
Cable-stiffened latticed beam
Synthetic reinforcement
