Application of the HF, DRA and DCDA technologies for in situ stress determination in Iron Quadrangle rock masses

IF 1.7 Q3 ENGINEERING, GEOLOGICAL

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-08-02 DOI:10.1080/17486025.2021.1955162

Henrique de Andrade Penido, A. Funato, H. Metsugi, V. F. Navarro Torres, Juan Manuel Girao Sotomayor, Phillip Dight, Rodrigo Peluci de Figueiredo, André Pacheco de Assis, A. Guimarães

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引用次数: 1

Abstract

ABSTRACT This study presents an unprecedented campaign of measurements (magnitudes and orientations) of the in situ stresses in itabirite rocks of the Brazilian Iron Quadrangle region using the hydraulic fracturing (HF), deformation rate analysis (DRA) and diametrical core deformation analysis (DCDA) methods. The previous studies of this rock mass consider estimated values of k, and the practice of using in situ stress tests to support geotechnical analyses of the rock mass of this region has not been adopted. The study site is located at a depth of up to 400 m around a pit. The rock mass under study shows the presence of different geological structures, which made performing the tests difficult. The DRA results show a marked difference compared to the HF and DCDA results; the horizontal stresses were greater than the vertical stresses, which is a finding that may occur due to local geodynamic influences. The results contribute to the understanding of the strains and stresses induced by mining activities in the Brazilian Iron Quadrangle. For a better determination of the regional in situ stresses in the rock mass of the Brazilian Iron Quadrangle, new HF tests, as well as hydraulic testing of pre-existing fractures are recommended.

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HF、DRA和DCDA技术在铁四边形岩体地应力测定中的应用

摘要本研究采用水力压裂（HF）、变形率分析（DRA）和径向岩心变形分析（DCDA）方法，对巴西铁四边形地区铁英岩的原位应力进行了前所未有的测量（大小和方向）。以前对该岩体的研究考虑了k的估计值，而使用现场应力测试来支持该区域岩体岩土工程分析的做法尚未被采用。研究地点位于一个坑周围400米深的地方。研究中的岩体显示出不同的地质结构，这使得测试变得困难。DRA结果显示出与HF和DCDA结果相比的显著差异；水平应力大于垂直应力，这可能是由于局部地球动力学的影响而出现的。研究结果有助于理解巴西铁象限采矿活动引起的应变和应力。为了更好地确定巴西铁象限岩体中的区域原位应力，建议进行新的HF试验以及对已有裂缝进行水压试验。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geomechanics and Geoengineering-An International Journal ENGINEERING, GEOLOGICAL-

CiteScore

3.80

自引率

0.00%

发文量

期刊介绍： Geomechanics is concerned with the application of the principle of mechanics to earth-materials (namely geo-material). Geoengineering covers a wide range of engineering disciplines related to geo-materials, such as foundation engineering, slope engineering, tunnelling, rock engineering, engineering geology and geo-environmental engineering. Geomechanics and Geoengineering is a major publication channel for research in the areas of soil and rock mechanics, geotechnical and geological engineering, engineering geology, geo-environmental engineering and all geo-material related engineering and science disciplines. The Journal provides an international forum for the exchange of innovative ideas, especially between researchers in Asia and the rest of the world.