— The uniaxial compressive strength of the rock specimens was tested using a SHT4106 microcomputer-controlled electro-hydraulic servo universal testing machine with a maximum load of 1000 kN, which ...

Point Load test is an alternate method that can be used to adequately predict the uniaxial compressive strength of a rock material using a portable and simpler equipment. Schmidt Hammer Rebound test is also a technique used for this purpose but, it is admitted that its results are far more variable and affected by testing methods. ...

 — The compressive strength is one of the most important parameters for the analysis of mechanical response and instability in many geological and geotechnical applications [1], [2], [3], [4].Over the years, a number …

where σ ci is the uniaxial compressive strength, m i is a constant based on the rock type, σ 1 and σ 3 are the principal stresses. After conducting at least 3 triaxial tests in different lateral pressures, the best-fit envelopes of the criterion selected are plotted and the parameters of each one (cohesion, friction angle in M-C and m i, σ ...

 — 1. Introduction. The determination of basic mechanical properties of rocks is crucial to a specific engineering project. Several mechanical properties, including uniaxial compressive strength (UCS), have become widely accepted parameters for rock design projects (Baskerville, 1987).From past to present, direct and indirect methods have been …

 — The uniaxial compressive strength (UCS) of rocks is one of the key parameters for evaluating the safety and stability of civil and mining structures. In this study, 386 rock samples containing four properties named the load strength (PLS), the porosity (Pn), the P-wave velocity (Vp), and the Schmidt hardness rebound number (SHR) are …

 — Uniaxial compressive strength (UCS) of rock is an essential parameter in geotechnical engineering. Point load strength (PLS), P-wave velocity, and Schmidt hammer rebound number (SH) are more easily obtained than UCS and are extensively applied for the indirect estimation of UCS. This study collected 1080 datasets consisting of SH, P …

 — Data acquisition Compressive strength data of rocks are collected from a wellbore drilled in a sandstone reservoir in Iran, and analysis is performed between the data of input parameters chosen to predict rock strength for near field area by constructing a new relationship for rock strength estimation.

 — The strength of rock under different stress states satisfies the following law: triaxial compressive strength>biaxial compressive strength>uniaxial compressive strength>shear strength>tensile strength. Usually, if the load reaches the instantaneous strength (commonly known as uniaxial compressive strength) of rock, the rock is broken.

 — The uniaxial compressive strength (UCS) of rocks is a vital geomechanical parameter widely used for rock mass classification, stability analysis, and engineering design in rock engineering. Various UCS testing methods and apparatuses have been proposed over the past few decades. The objective of the present study is to summarize …

 — The unconfined compressive strength (UCS) of rocks is one of the most significant parameters for stability analysis and design of many rock engineering projects, particularly when the rocks are subjected to compressive stresses with low confining pressure [].There are generally two types of methods for determination of the UCS: (a) …

 — In order to establish an optimal model for reasonably predicting the uniaxial compressive strength (UCS) of rocks, a method based on feature optimization and SSA-XGBoost was proposed. Firstly, the UCS predictor system of rocks, considering petrographic and physical parameters, was determined based on the systematic …

 — It is also an established fact in the literature that the tensile strength of rock is related to its compressive strength. According to Sheorey (), the compressive strength of rock is ten times higher than its tensile strength.A study by Kahraman et al. shows a linear correlation between UCS and BTS for different rock types.This proposed correlation is in …

 — Uniaxial compressive strength (UCS) is one of the most widely used rock mechanical parameters in rock engineering like design and construction of foundations, …

 — The compressive strength of a rock mass can be determined by in situ testing. Such tests are used in civil engineering and involve among others, plate bearing, hydraulic pressure chamber, flat ...

 — Uniaxial compressive strength (UCS) has become a highly essential strength parameter in the mining, civil and geomechanical industries. Estimating the exact value of the strength of rock has become a matter of great concern in real life. Despite this, there have been many works to indirectly/directly estimate the UCS of rocks. This study …

 — The uniaxial compressive strength (UCS) is an important parameter for rock mass classification and rock engineering designs. This study proposes a novel method for predicting the UCS of rocks using X-ray computed tomography and convolutional neural networks. First, X-ray CT scanning was conducted on five mudstone specimens. The …

 — The uniaxial compressive strength of rock is one of the most significant parameters required for analysis of rock mass, its characterization, and design of foundations. Direct determination of the uniaxial compressive strength of rock is time-consuming, expensive, and requires destructive laboratory or field testing. Therefore, …

 — Rock engineering tasks like tunnelling, dam and building construction, and rock slope stability rely heavily on properly estimating the rock's uniaxial compressive …

 — The uniaxial compressive strength (UCS) of rocks is a vital geomechanical parameter widely used for rock mass classification, stability analysis, and engineering …

The strength of rocks and soil is a crucial design parameter in engineering projects, and it can be determined through various test methods such as uniaxial compressive strength, tensile strength ...

 — Keywords: uniaxial compressive strength, rock, BP neural network, swarm intelligence optimization algorithm, normalized mutual information. Citation: Lei Y, Zhou S, Luo X, Niu S and Jiang N (2022) A Comparative Study of Six Hybrid Prediction Models for Uniaxial Compressive Strength of Rock Based on Swarm Intelligence Optimization …

 — Uniaxial compressive strength (UCS) of rock is crucial for any type of projects constructed in/on rock mass. The test that is conducted to measure the UCS of rock is expensive, time consuming and having sample restriction. For this reason, the UCS of rock may be estimated using simple rock tests such as point load index (I s(50)), …

 — The rock compressive strength (Li et al., 2018; Gao et al., 2022; Meng et al., 2021), tensile strength (Liu et al., 2022b), and fracture toughness (Liu et al., 2022a; Zhang et al., 2023a) of frozen-thawed rocks when subjected to dynamic impacts have garnered substantial attention in recent years. Dynamic compressive strength (DCS) is a crucial ...

 — The strength characteristics of a rock is a criterion for its ability to be drilled and fractured. The uniaxial compressive strength (UCS) is the most commonly used strength index in construction industry and in rock engineering projects. Therefore, a comprehensive knowledge on the factors that could influence the value of the …

 — Uniaxial compressive strength (UCS) is one of the most widely used rock mechanical parameters in rock engineering like design and construction of foundations, tunneling, slope stability investigations, etc. UCS is also the only parameter to assess rock material strength in Rock Mass Rating (RMR) proposed by Bieniawski (1989).However, …

 — Kulhawy and Goodman (1987) suggested that, as a first approximation, the unconfined compressive strength σ cm of rock masses be taken as 0.33σ c when RQD is less than about 70% and then linearly increase to 0.8σ c when RQD increases from 70% to (see Fig. 8), where σ c is the unconfined compressive strength of the intact rock.

 — The uniaxial compressive strength and tensile strength of rock are important parameters for rock classification, tunnel engineering and so on (Ozturk and Nasuf 2013; Milne 2007).During excavation in mining and tunnel engineering projects, the surrounding rock may experience tensile failure due to construction impacts; hence, the BTS of rock …

In particular, the Uniaxial Compressive Strength is re-calculated as: σ c = σ UCS / (0.88 + 0.222*(D/L) ) Where σ c is the corrected uniaxial compressive strength. Rock characterization and typical range of UCS …

 — Rock tensile strength is one of the critical mechanical properties governing the stability of rock structures, such as tunnels, caverns, and slopes. The tensile strength of rocks is usually ten times lower than the compressive strength (Hoek 1968), making underground openings vulnerable under tensile stress conditions (Diederichs and Kaiser …