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坑洞边界周围坑洞干扰带(EDZ)的存在可能会严重地影响坑洞的施工作业和人员及设备的日常安全。因此,在不同岩石处的挖掘工程中,它已成为一项重要的研究课题。坑洞干扰带通常定义为坑洞边界外围的岩石带,由于坑洞作用和压力的重新分配,该处岩石的物理、力学和液压性质受到巨大影响。为了优化岩石支撑设计,对瑞典LKAB基律纳瓦拉的地下铁矿来说,了解坑洞干扰带是必要的。针对这一主要目的,我们运用地震测量技术在矿山进行了坑洞干扰带的调查研究。研究主要采用的是井间地震和面波频谱分析(SASW)技术,再辅以井下图像处理系统(BIPS)作为地震测量技术的补充。结果表明:在采矿平巷边界的后面存在厚度为0.5～1.0m的坑洞干扰带。该带的杨氏模量大小是未受干扰岩石的50%～90%。
The presence of a pit interference zone (EDZ) around the perimeter of the pit can have a significant impact on the pit construction work and the day-to-day safety of personnel and equipment. Therefore, it has become an important research topic in excavation projects at different rocks. Pothole interference zone is usually defined as a rock zone around the periphery of a pothole whose physical, mechanical and hydraulic properties are greatly affected by the potholes and redistribution of pressure. In order to optimize the design of rock bracing, it is necessary to understand the pits of the pits for the underground mine in Kiryuvalla, LKAB, Sweden. In response to this main purpose, we conducted a survey of pit interference zones in the mine using seismic surveying techniques. The study mainly uses cross-well seismic and surface wave spectrum analysis (SASW) techniques, complemented by a borehole image processing system (BIPS) as a supplement to seismic measurement techniques. The results show that there is a pits interference zone with a thickness of 0.5-1.0 m behind the boundary of mining lane. The band’s Young’s modulus is 50% to 90% of the undisturbed rock.