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在露采矿山地质环境调查成果的基础上，分析了南京市露采矿山环境现状，指出了矿山存在的环境问题，提出了矿山环境保护与整治建议，为科学有序地开展矿山环境整治及制定相关政策提供了依据。 相似文献
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2001年度世界上有4个露采、2个地浸、1个地下常规方法开采的铀矿山要投产，本文将介绍这些铀矿山的基本情况。 相似文献
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在露采矿山,块段原矿品位和开采生产品位的预测是生产中经常的、大量的工作之一,矿石品位预测的正确与否,对矿产资源的充分利用、矿石质量的控制及矿山生产门稳定性有着十分重大的意义。本文拟以内蒙某露采铁矿为例,就矿石品位的预测问题作些讨论。一、块段原矿品位的预测问题露采矿山生产勘探的主要手段之一是槽探,即在开采台阶上以较密的线距(约25~50米)布置探槽,在槽中连续取样,以槽探的资料用算术平均法或加权平均法来预测块段原矿的品位。这种估计方法的精度及可靠性如何,过去缺乏实际对比资料。近年来,国外多采用估计 相似文献
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《矿产与地质》2018,(6)
图木尔廷-敖包锌矿是蒙古国一处大型在产矿山。近年来,通过不断调整找矿思路,矿山深部找矿终获突破,在原Ⅰ号主矿体深边部发现了Ⅱ号矿体。在总结矿床地质特征的基础上,利用3DMine软件构建了矿床三维地质模型,运用距离幂次反比法对最终露采境界外资源量进行了估算。结果表明:利用3DMine估算的资源量与Micromine估算的结果基本一致,与传统方法估算的结果也在误差范围之内。由此说明:使用三维地质建模软件估算的资源储量是可靠的,最终露采境界外地质资源储量模型的建立,直观地揭示了深部矿体的空间展布与形态,为矿山露天转地下开采可研和设计提供了基础操作平台,建议矿山露天转地采阶段将该地质资源模型与采掘井巷工程集成在一起,实现资源储量的动态管理。 相似文献
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江西富家坞矿区露采基建剥离工程于1991年底开始施工，6年以后，于1997年11月发生露采边坡大垮塌，导致即将竣工投产的“坑改露”工程彻底失败。本文研究分析了造成该矿区露采边坡垮塌的主要原因，针对露采边坡垮塌后的现状，提出了今后恢复生产的治理措施。对以后类似工程的设计及生产矿山有一定的参考价值。 相似文献
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在调查露采宕口现状的基础上,采用定性与定量相结合的层次分析法,建立系统评价的结构模型和数学模型.通过计算分级,确定矿山地质环境极差区、较差区和一般区的范围和面积.结果表明,该区山体地质环境质量总体较差,地质灾害隐患多.但经过适当的恢复治理,大多数宕口和矿山废弃土地可得到利用. 相似文献
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露采矿山是江苏的主体矿山，占用并破坏大量的土地资源，资源禁采后，采矿宕口的复垦给土地资源紧缺的江苏带来了增量土地资源的广阔前景，尤其是城市规划区内，土地复垦的环境、社会和经济效益十分显著。在分析全省露采矿山占用与破坏土地资源不同特征的基础上，初步估算全省露采矿山可复垦的土地资源面积及可复垦土地资源类型，并对土地复垦产生的经济、环境和社会效益进行分析评估，为露采矿山环境治理奠定基础。 相似文献
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Nan Jiang Chuanbo Zhou Shiwei Lu Zhen Zhang 《Geotechnical and Geological Engineering》2018,36(3):1475-1489
Investigating the propagation and attenuation of blast vibration in rock slopes is the key point to assess the influence of underground mine blasting on overlaying open pit slopes stability and determining the potential risk. In this paper, Daye Iron Mine in China has been chosen as the case to study the effect of blast vibrations on overlaying open pit slopes due to underground mine blast. Firstly, the characteristics of blast loadings are analyzed by the dynamic finite element method. Then, a three dimensional (3D) numerical model of the open pit and the underground mine is made, which is verified by the field monitoring data to prove its reliability. The effect of blast vibration on overlaying open pit slope due to underground mine blasting are discussed based on the peak particle velocity (PPV) and the peak effective tensile stress (PETS) distribution characteristics which are calculated and analyzed by inputting the obtained blast vibration data into the numerical model. The results show that the effect of present mining blasting on the stability of pit slopes are limited because the simulated maximum PPV and PETS of monitoring point on slopes are all < 0.747 cm/s and 0.738 MPa. At last, according to numerical simulations of the underground mine blasting, the PPV predicting formulas for the slopes in Daye Open Pit Iron Mine is proposed based on the classic Sadaovsk formula. 相似文献
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基坑工程是典型的三维空间问题,只有在一定条件下才能简化为平面应变问题。针对基坑工程的空间效应问题,首先采用离心模型试验建立基坑工程三维模型,分析承压水位变动条件下基坑变形规律;然后,进一步开展三维数值模拟,与离心模型试验结果进行对比验证,并开展基坑长度、开挖深度、承压水位高度和基坑面积等因素对基坑三维空间效应的影响研究。研究表明：三维基坑离心模型试验监测得到基坑中部和角部断面处的地连墙水平位移以及基坑外侧地表沉降,验证了角隅效应,且承压水位上升时角隅效应更显著;影响因素分析表明,长江I级阶地中当基坑长度大于6倍开挖深度时,基坑中间断面基本为平面应变状态;随开挖深度逐渐增大时平面应变比显著增大,而当深度大于25 m时增大速率减缓;承压水位升高时角隅效应更显著,承压水位超出地表3 m时平面应变比为0.46。该研究成果为长江I阶地典型二元结构地层深大基坑的设计和施工提供依据。 相似文献
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Marzieh Shademan Khakestar Hossein Hassani Parvizz Moarefvand Hassan Madani 《Journal of the Geological Society of India》2016,87(1):97-104
Almost all collapses of rock slopes especially in open pit mines are related to discontinuities such as bedding planes, faults and major joints.Geostatistical assessments can be used for understanding the distribution of regionalized variables in any spatial study. In this paper3D spatial dispersion of the fault planes in the Gole Gohar open pit iron mine, located in Kerman province, south east of Iran, is modeled. Then, regionalized variable theory is used to analyze and interpret spatial distribution of the following geotechnical parameters: Geological strength index (GSI), Rock quality designation (RQD), Cohesion (C) and angle of internal friction (f). In order to define regionalized variable distribution, variogram functions were determined for identifying the regional behavior. Structural analysis of variograms showed that the mentioned parameters have spatial structures that make it possible to set up a geostatistical model to predict their values for each non-sampled block on the pit wall. Results showed that there is a relation between the low values of geotechnical parameters and the existence of discontinuities around the pit area. The role of discontinuities in the occurrence of collapses in the area was clearly demonstrated by comparing the estimated parameters models and the model of discontinuities dispersion. 相似文献
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随着智能钻机的研发和使用,能够准确地获得爆破钻孔的岩性数据.通过建立炮孔数据库对智能识别的炮孔数据进行存储和管理;以炮孔岩性数据为样本,使用距离平方反比法对爆破区域范围内的实体单元进行插值,生成爆破岩体三维实体模型;使用爆破区域范围多边形和采场三角网先后对岩体三维实体模型进行裁切,得到裁切后的爆破岩体三维实体模型.使用... 相似文献
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在有、无内排土条件下,对6个均质边坡模型和伊敏一露天矿边坡模型的端帮边坡角进行了数值模拟计算与分析。结果表明,在安全系数不变的前提下内排土可以提高露天矿端帮边坡的最大稳定边坡角,从而减少了剥离量或增加采出矿石量,降低剥采比,提高矿山经济效益。 相似文献
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《Geomechanics and Geoengineering》2013,8(3):189-199
Numerical models are useful in the evaluation of the interaction between groundwater systems and mining activities. They can be successfully used to predict the quantity of inflow into open pits and to design an appropriate dewatering system. In this paper, a two-dimensional axi-symmetric finite element model called SEEP/W has been used to predict the groundwater inflow into Sangan open pit mine (anomaly north C). The Sangan iron mine is located at 280 km south-east of Mashhad, Iran, in arid and warm climate conditions wherein precipitation is generally limited. The water inflow to the pit is mainly from a confined aquifer, mainly by horizontal flow in the upper layers and vertical flow at the pit bottom. The results of the numerical model of the ground water inflow are presented and compared with those obtained from Theis, Cooper-Jacob and Jacob-Lohman analytical solutions. Ground water inflow monitoring was also carried out in a trial excavation at the Sangan mine in order to calibrate the model. The model was then used to predict groundwater inflow into Sangan open pit mine during its advancement. This model provides valuable information for designing an appropriate dewatering system. 相似文献
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Fan Yongbo Li Shihai Zhou Yang Fan Zhiyong Liu Xiaoyu 《Geotechnical and Geological Engineering》2016,34(2):425-435
The locations of the 2013 eastern ShengLi open pit mine landslide and the 2010 northern ShengLi open pit mine landslide were both in the XilinHot city of Inner Mongolia province, in areas with similar geographical, regional geological, geomorphic conditions and excavation depth. There are so many similar characteristics, such as landslides triggered by the rain storms, landslides occurred many times, landslides with long time deformation, but there are also some differences between the two landslides, such as the scale and failure mode. Field investigations showed that the two landslides were both occurred several days after the rain storms, the eastern ShengLi open pit mine landslide body with the volume of 85 million m3 has been in persistent deformation with an observed maximum horizontal displacement of 58 m in August 2013, Furthermore the implemented check dams at east open pit mine had not formed an efficacious blocking system to resist the flow because of incorrect judgment regarding the landslide style. The northern ShengLi open pit mine landslide body with 0.5–1 million m3 occurred several times after each rain storm. In the whole, the time of persistent deformation about the eastern ShengLi open pit mine was much longer than that of the northern ShengLi open pit mine because of the difference of the filling material of fault and space combination between the faults and the slope. Field investigation, physical model experiments, real-time displacement monitoring and numerical simulation were implemented to investigate the characteristics, mechanism, and retaining measures of the two landslides. The insights gleaned herein may be valuable for the understanding of the mechanisms of landslides and improving preventative measures against these types of events in north China in the future. 相似文献
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