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Monitoring of Strain and Temperature in an Open Pit Using Brillouin Distributed Optical Fiber Sensors

机译：使用布里渊分布式光纤传感器监控露天矿中的应变和温度

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Marble quarries are quite dangerous environments in which rock falls may occur. As many workers operate in these sites, it is necessary to deal with the matter of safety at work, checking and monitoring the stability conditions of the rock mass. In this paper, some results of an innovative analysis method are shown. It is based on the combination of Distributed Optical Fiber Sensors (DOFS), digital photogrammetry through Unmanned Aerial Vehicle (UAV), topographic, and geotechnical monitoring systems. Although DOFS are currently widely used for studying infrastructures, buildings and landslides, their use in rock marble quarries represents an element of peculiarity. The complex morphologies and the intense temperature range that characterize this environment make this application original. The selected test site is the Lorano open pit which is located in the Apuan Alps (Italy); here, a monitoring system consisting of extensometers, crackmeters, clinometers and a Robotic Total Station has been operating since 2012. From DOFS measurements, strain and temperature values were obtained and validated with displacement data from topographic and geotechnical instruments. These results may provide useful fundamental indications about the rock mass stability for the safety at work and the long-term planning of mining activities.
机译：大理石采石场是非常危险的环境，可能会发生岩石倒塌。由于许多工人在这些地点工作，因此有必要处理工作中的安全问题，检查并监视岩体的稳定状况。在本文中，显示了一种创新分析方法的一些结果。它基于分布式光纤传感器（DOFS），通过无人机（UAV）进行的数字摄影测量，地形和岩土监测系统的组合。尽管DOFS目前广泛用于研究基础设施，建筑物和滑坡，但它们在岩石大理石采石场中的使用代表了特殊性。该环境的特征是复杂的形态和强烈的温度范围，使该应用具有独创性。选定的测试地点是位于意大利阿普安阿尔卑斯山的洛拉诺露天矿；自2012年以来，这里已安装了由引伸计，裂缝计，斜度计和机器人全站仪组成的监控系统。通过DOFS测量，获得了应变和温度值，并使用了地形和岩土仪器的位移数据进行了验证。这些结果可能为岩体稳定性提供有益的基础指示，以确保工作安全和采矿活动的长期计划。

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