Isotopic and hydro-geochemical surveys were carried out to identify the source of mine inrushing water at the #73003 face in the Laohutai Mine. Based on the analysis of isotopes and hydro-chemical features of surface ...Isotopic and hydro-geochemical surveys were carried out to identify the source of mine inrushing water at the #73003 face in the Laohutai Mine. Based on the analysis of isotopes and hydro-chemical features of surface water, groundwater from different levels and the inrushing water, a special relationship between water at the #73003 face and cretaceous water has been found. The results show that the isotopic and hydro-chemical features of the inrushing water are completely different from those of other groundwater bodies, except for the cretaceous water. The isotopic and hydrochemical characteristics of cretaceous water are similar to the inrushing water of the #73003 face, which aided with obtaining the evidence for the possible source of the inrushing water at the #73003 face. The isotope calculations show that the inrushing water at the #73003 face is a mixture of cretaceous water and Quaternary water. Water from the cretaceous conglomerate is the main source, accounting for 67% of the inrushing water, while the Quaternary water accounts for 33%. The conclusion is also supported by a study of inrushing-water channels and an active fault near the inrushing-water plot on the #73003 face.展开更多
露天煤矿长时间大流量疏排降水导致矿区地下水资源严重浪费、井田周围生态环境急剧退化、生产运行成本大幅增加,截水帷幕技术为露天矿山地下水控制提供了新的思路。槽段稳定性直接关系到截水帷幕施工安全、成槽效率及防渗效果。为探讨...露天煤矿长时间大流量疏排降水导致矿区地下水资源严重浪费、井田周围生态环境急剧退化、生产运行成本大幅增加,截水帷幕技术为露天矿山地下水控制提供了新的思路。槽段稳定性直接关系到截水帷幕施工安全、成槽效率及防渗效果。为探讨矿山截水帷幕砂卵石地层在成槽时长幅槽段的稳定性,以我国内蒙古东部某露天煤矿为例,采用二维和三维水平条分法对砂卵石地层长幅槽段稳定性影响因素及规律进行研究,并对比分析二维与三维水平条分法在安全系数计算结果上的差异;借助FLAC^(3D)软件模拟分析砂卵石地层分别开挖17.5、22.5 m 2种长度时槽段的稳定性;结合上述分析结果给出砂卵石地层长幅槽段稳定性控制措施;再通过超声波测试手段验证长幅槽段稳定性及控制效果。研究结果表明:影响槽段稳定性的主要因素有地层岩土体性质、槽段开挖深度、泥浆液面、泥浆密度、泥浆液面与地下水位高差及单幅槽段长度;调整泥浆参数、提高泥浆液面、降低地下水位、优化成槽次序及控制成槽时间等措施可以增加长幅槽段的稳定性;该地层条件下单幅槽段长度不超过21 m时,槽段可以保持直立稳定,长幅成槽技术可行。展开更多
基金financially supported by the Xi'an Branch of the Coal Research Institute
文摘Isotopic and hydro-geochemical surveys were carried out to identify the source of mine inrushing water at the #73003 face in the Laohutai Mine. Based on the analysis of isotopes and hydro-chemical features of surface water, groundwater from different levels and the inrushing water, a special relationship between water at the #73003 face and cretaceous water has been found. The results show that the isotopic and hydro-chemical features of the inrushing water are completely different from those of other groundwater bodies, except for the cretaceous water. The isotopic and hydrochemical characteristics of cretaceous water are similar to the inrushing water of the #73003 face, which aided with obtaining the evidence for the possible source of the inrushing water at the #73003 face. The isotope calculations show that the inrushing water at the #73003 face is a mixture of cretaceous water and Quaternary water. Water from the cretaceous conglomerate is the main source, accounting for 67% of the inrushing water, while the Quaternary water accounts for 33%. The conclusion is also supported by a study of inrushing-water channels and an active fault near the inrushing-water plot on the #73003 face.
文摘露天煤矿长时间大流量疏排降水导致矿区地下水资源严重浪费、井田周围生态环境急剧退化、生产运行成本大幅增加,截水帷幕技术为露天矿山地下水控制提供了新的思路。槽段稳定性直接关系到截水帷幕施工安全、成槽效率及防渗效果。为探讨矿山截水帷幕砂卵石地层在成槽时长幅槽段的稳定性,以我国内蒙古东部某露天煤矿为例,采用二维和三维水平条分法对砂卵石地层长幅槽段稳定性影响因素及规律进行研究,并对比分析二维与三维水平条分法在安全系数计算结果上的差异;借助FLAC^(3D)软件模拟分析砂卵石地层分别开挖17.5、22.5 m 2种长度时槽段的稳定性;结合上述分析结果给出砂卵石地层长幅槽段稳定性控制措施;再通过超声波测试手段验证长幅槽段稳定性及控制效果。研究结果表明:影响槽段稳定性的主要因素有地层岩土体性质、槽段开挖深度、泥浆液面、泥浆密度、泥浆液面与地下水位高差及单幅槽段长度;调整泥浆参数、提高泥浆液面、降低地下水位、优化成槽次序及控制成槽时间等措施可以增加长幅槽段的稳定性;该地层条件下单幅槽段长度不超过21 m时,槽段可以保持直立稳定,长幅成槽技术可行。
