Comparative study of the deformation modulus of rock mass

Panthee, Suman; Singh, Pankaj; Kainthola, Ashutosh; Das, Ratan; Singh, T. N.

doi:10.1007/s10064-016-0974-3

Cited by 19 publications

(4 citation statements)

References 14 publications

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“…On the other hand, under the same disturbance stress environment, the failure degree and failure mechanism of various types of rocks are considerably different, 31–34 and the above literature survey confirms this issue. Particularly for the rock mass which is commonly composed of multilayered rock layers.…”

Section: Introductionmentioning

confidence: 76%

“…[23][24][25][26][27] However, in practical engineering applications, the stress environment of rocks is complex, and it is more conducive to solving complex engineering problems with the help of a true triaxial test system to study rock mechanics problems. [28][29][30] On the other hand, under the same disturbance stress environment, the failure degree and failure mechanism of various types of rocks are considerably different, [31][32][33][34] and the above literature survey confirms this issue. Particularly for the rock mass which is commonly composed of multilayered rock layers.…”

Section: Introductionmentioning

confidence: 81%

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Analysis of damage characteristics of fine and medium‐fine cracked sandstones under a complex stress path

Xia

et al. 2022

Energy Science & Engineering

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In underground engineering such as mining and tunnel excavation, the rock mass is often subjected to repeated loading and unloading stress environments. Herein, true triaxial cyclic loading and unloading tests are carried out on fine sandstone and medium-fine sandstone specimens with cracks of different angles. The test results show that the mechanical properties of fine sandstone and medium-fine sandstone samples show obvious differences, and the crack angle has a significant effect on the mechanical properties of the sandstone specimen. During the experimentation, the expansion phenomenon of medium-fine sandstone is more obvious than that of fine sandstone, and its brittleness is also weaker. The damage law of the sample has nothing to do with the type of sandstone. The damage caused by the stress in the σ 1 direction varies linearly with the cumulative damage of the specimen, however, the damage caused by the directions of σ 2 and σ 3 grow nonlinearly in terms of the cumulative damage of the specimen. The hysteretic loop dissipated energy of the same type of sandstone specimens at different angles are dissimilar, and the dissipated energy increases with the increase of the crack angle. Based on the equivalent irreversible strain and the hysteretic loop dissipated energy, the damage law of the rock strength is analyzed. The obtained results reveal that the index based on the equivalent irreversible strain is helpful in exploring the damage degree of rock in the initial stage of cyclic loading and unloading. Furthermore, the damage index established based on the energy dissipation concept is beneficial to predicting the damage and failure law of rock in the advanced stage of loading.

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Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 81%

Analysis of damage characteristics of fine and medium‐fine cracked sandstones under a complex stress path

Xia

et al. 2022

Energy Science & Engineering

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“…However, the pattern of E m with rock mass quality was observed significantly for all equations. According to Kayabasi et al [23] and Panthee et al [43], significant results between E m calculated by using empirical equations and rock mass class were not observed but Hoek and Diederichs [7] revealed that E m values increases with an increase in rock mass class (Figure 4) by using exponentially or power function (Table 1) [21] show apositive correlation with Q values (R 2 = 0.96 and 0.98) as shown in Figure 8. Likewise, the calculated values of E m with equations suggested by Bieniawski [15], Read et al [20], Gokceoglu et al [22], Palmstrom [42] have been plotted against RMR values (Figure 9) that presented direct correlation (R 2 = 1, 0.99, 0.97 and 0.99).…”

Section: Estimation Of Rock Mass Deformation Modulusmentioning

confidence: 91%

Assessment of Rock Mass Quality and Deformation Modulus by Empirical Methods along Kandiah River, KPK, Pakistan

Akram¹,

Mirza²,

Zeeshan³

et al. 2018

OJG

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The pivotal aim of this study is to evaluate the rock mass characterization and deformation modulus. It is vital for rock mass classification to investigate important parameters of discontinuities. Therefore, Rock Mass Rating (RMR) and Tunneling quality index (Q) classification systems are applied to analyze 22 segments along proposed tunnel routes for hydropower in Kandiah valley, Khyber Pakhtunkhwa, Pakistan. RMR revealed the range of fair to good quality rocks, whereas Q yielded poor to fair quality rocks for investigated segments of the rock mass. Besides, E m values were acquired by empirical equations and computer-aided program RocLab, and both methods presented almost similar variation trend of their results. Hence, the correlations of E m with Q and RMR were carried out with higher values of the regression coefficient. This study has scientific significance to initially understand the rock mass conditions of Kandiah valley. 948Open Journal of Geology have been conducted by using RMR and Q schemes e.g. [2]-[12]. Among the rock mass parameters, deformation modulus (E m ) has very significance in rock mechanics because it provides the initial idea about mechanical behavior of rock mass before failure. In this regard, there are several direct procedures to determine the deformation modulus in the laboratory, but these methods are costly and time consuming. Therefore, empirical methods have been suggested for indirect estimation of deformation modulus [13] [14]. As a consequence, various researchers [7] [15]-[25] have been proposed different empirical relations for estimation of deformation modulus. Pakistan is facing a serious shortage of electricity, and Government is trying to develop hydropower, especially in Northern Pakistan to overcome the electricity disorder. In this regard, small hydropower is proposed along Kandiah River in Kandiah valley, KPK, Pakistan. Hence, the present study focuses on preliminary rock mass characterization with an assessment of required support and estimation of deformation modulus along proposed tunnel routes. Therefore, to achieve this goal, field observations including geological mapping, discontinuity surveys and sampling were conducted.

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“…These cracks created a water line and decreased the deformation modulus of rocks. Even though, according to [2], deformation modulus is a very significant parameter to measure the strength of rocks in rock sciences. Aside from the modulus, water condition is very influential in the discontinuity or rocks [3].…”

Section: Introductionmentioning

confidence: 99%

Rock slope stability analysis by approximation of geological strength index and finite element method

2019

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As a part of natural geography systems, rock slopes have treasured amount of natural resources potential. The rock materials could be utilized to fulfill several needs, especially to construct buildings. However, society sometimes have taken advantages from the slope’s existence in wrong ways. The exploitations toward rock materials, either through manual or modern way (blasting) have caused some cracks occurred. These cracks have reduced the stability of rock slopes and easily triggered failures on rock slopes. In this paper, the stability of a rock slope will be precisely discussed by using Geological Strength Index (GSI) and was analyzed by using finite element method. The rock samples were taken from Pangkalan (West Sumatera, Indonesia), which this location is also vulnerable to rock slope failures. Geological Strength Index was obtained by doing manual observations on rock sample’s properties, i.e. joint, cracks, and discontinuity. The result was consisted of rock’s properties. Meanwhile, the analysis by using finite element method produced an outcome in form of safety factor. This result could be made as a reference for pre-disaster mitigation in Pangkalan.

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Comparative study of the deformation modulus of rock mass

Cited by 19 publications

References 14 publications

Analysis of damage characteristics of fine and medium‐fine cracked sandstones under a complex stress path

Analysis of damage characteristics of fine and medium‐fine cracked sandstones under a complex stress path

Assessment of Rock Mass Quality and Deformation Modulus by Empirical Methods along Kandiah River, KPK, Pakistan

Rock slope stability analysis by approximation of geological strength index and finite element method

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