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Investigation of Dimension Stone on the Island Bra?—Geophysical Approach to Rock Mass Quality Assessment

机译：岛屿文胸尺寸石头的调查 - 岩石质量评估

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A site located on the island of Bra? is known in history for world-famous architectural stone and stone mining, dating all the way back to ancient Greek and Roman times. The most famous building constructed from the stone from Bra? is the Diocletian Cesar Palace in the town Split. Prospective new locations for quarries are still required because the demand for the stone from the island is still high. This paper presents a review of undertaken geophysical investigations, as well as engineering geologic site prospection, with the purpose of determining if the rock mass quality is suitable for the mining of massive blocks needed for an architectural purpose—dimension stones. Several surface noninvasive geophysical methods were applied on the site, comprising of two seismic methods, multichannel analysis of surface waves (MASW) and shallow refraction seismic (SRS) electrical methods of electrical resistivity tomography (ERT), as well as electromagnetic exploration with ground penetrating radar (GPR). Results of geophysical investigations were compared to the engineering geologic prospection results, as well to the visible rock mass structure and observed discontinuities on the neighboring existing open mine quarry. Rock mass was classified into three categories according to its suitability for dimension stone exploitation. Each category is defined by compressional and shear seismic velocities as well as electrical resistivity. It has been found that even small changes in moisture content within the large monolithic rock mass can influence measured values of electrical resistivity. In the investigated area, dimension stone quarrying is advisable if the rock mass has values of resistivity higher than 3000 Ωm, as well as compressional seismic velocities higher than 3000 m/s and shear wave velocities higher than 1500 m/s. Georadar was found to be a good tool for the visual determination of fissured systems, and was used to confirm findings from other geophysical methods.
机译：位于胸罩岛的网站？在历史上是世界着名的建筑石和石头挖掘的历史，一直追溯到古希腊和罗马时代。从胸罩的石头建造了最着名的建筑？是镇上的Diocletian Cesar Palace Split。潜在的采石场的新位置仍然需要，因为岛上石头的需求仍然很高。本文提出了对所承担的地球物理调查以及工程地质现场展望的审查，目的是确定岩石质量是否适合建筑用途维度石头所需的大规模块的开采。在现场施加几种表面非侵入性地球物理方法，包括两种地震方法，表面波（MasW）和浅折射地震（SRS）电阻率断层扫描（ERT）电气方法的多通道分析，以及地面穿透的电磁勘探雷达（GPR）。将地球物理研究结果与工程地质展望结果相比，以及可见岩体结构，观察了邻近现有的开放式采石场的不连续性。根据尺寸石头开发的适用性，岩体被分为三类。每个类别由压缩和剪切地震速度以及电阻率定义。已经发现，大型整体岩体内的水分含量变化甚至可能影响电阻率的测量值。在调查区域中，尺寸石采石是可取的，如果岩石质量有高于3000Ωm的电阻率值，以及高于3000米/秒的压缩地震速度，剪切波速度高于1500米/秒。发现雄咯地区是一种良好的视觉测定裂缝系统的工具，用于确认来自其他地球物理方法的结果。

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