Considering the Effect of Block-to-Matrix Strength Ratio on Geomechanical Parameters of Bimrocks
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ORIGINAL PAPER
Considering the Effect of Block-to-Matrix Strength Ratio on Geomechanical Parameters of Bimrocks Saeed Mahdevari . Parviz Moarefvand . Danial Mohammadzamani
Received: 7 March 2019 / Accepted: 5 April 2020 Springer Nature Switzerland AG 2020
Abstract The implementation of geomechanical projects is very challenging in rocks composed of rock blocks positioned in a weak matrix due to their complex structure. These types of rocks are called Block in matrix rocks or Bimrocks. Evaluating the geomechanical parameters of Bimrocks is significantly difficult. In this research, through fabricating large-scale physical samples, the effect of block size and volumetric block proportion (VBP) on compressive strength, deformation modulus, and velocity of S-wave and P-wave in Bimrocks were investigated. Using a 3D numerical simulation, the effect of variation in geomechanical parameters of matrix and rock blocks on strength and deformation modulus of the Bimrocks has been evaluated. The results show that the geomechanical parameters of rock blocks have a minor effect on the strength of Bimrocks; however, their effect becomes more when VBP is risen. The deformation modulus of Bimrocks is mostly affected by deformation modulus of matrix and the strength of Bimrocks is affected more by the cohesion of matrix.
S. Mahdevari (&) D. Mohammadzamani Department of Mining Engineering, Isfahan University of Technology, Isfahan 8415683111, Iran e-mail: [email protected] P. Moarefvand Department of Mining and Metallurgical Engineering, Amir Kabir University of Technology, Hafez 424, Tehran 15875-4413, Iran
Keywords Bimrock 3D numerical simulation Block-to-matrix strength ratio
1 Introduction Estimating the geomechanical parameters of particular rocks such as Conglomerates and Agglomerates, which consist of rock blocks in a fine-grain matrix, is very difficult due to their heterogeneous and complex structure. Moreover, achieving an undisturbed representative sample of these rocks is also demanding. Such rocks are called block in matrix rocks or Bimrocks (Mahdevari and Moarefvand 2017a). Bimrocks have been considered in myriads of studies such as Huang et al. (2015), Zhang et al. (2015), Zhou et al. (2015), Zhang and Li (2015), Jiang et al. (2015) and Tsesarsky et al. (2016); yet, their geomechanical properties have been rarely noticed due to difficulties associated with preparation of their undisturbed samples. Bimrocks forming under high pressure and heat conditions are called ‘‘welded-Bimrocks’’ (Altinsoy 2006). It is usually possible to provide samples of welded-Bimrocks. Providing an intact sample of unwelded-Bimrocks, however, is challenging regarding their weak matrix. In general, it can be noted that the geomechanical properties of Bimrocks is mostly affected by their matrix, volumetric block proportion (VBP), mechanical properties of blocks, shape and distribution
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Geotech Geol Eng
function of blocks and direction of blocks with respect to the fracture pl
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