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  • Open Access

    ARTICLE

    Uniaxial Compressive Strength Prediction for Rock Material in Deep Mine Using Boosting-Based Machine Learning Methods and Optimization Algorithms

    Junjie Zhao, Diyuan Li*, Jingtai Jiang, Pingkuang Luo

    CMES-Computer Modeling in Engineering & Sciences, Vol.140, No.1, pp. 275-304, 2024, DOI:10.32604/cmes.2024.046960

    Abstract Traditional laboratory tests for measuring rock uniaxial compressive strength (UCS) are tedious and time-consuming. There is a pressing need for more effective methods to determine rock UCS, especially in deep mining environments under high in-situ stress. Thus, this study aims to develop an advanced model for predicting the UCS of rock material in deep mining environments by combining three boosting-based machine learning methods with four optimization algorithms. For this purpose, the Lead-Zinc mine in Southwest China is considered as the case study. Rock density, P-wave velocity, and point load strength index are used as input variables,… More > Graphic Abstract

    Uniaxial Compressive Strength Prediction for Rock Material in Deep Mine Using Boosting-Based Machine Learning Methods and Optimization Algorithms

  • Open Access

    ARTICLE

    Experimental Study of Thermal-Hydraulic-Mechanical Coupling Behavior of High-Performance Concrete

    Wei Chen1,*, Wenhao Zhao1, Yue Liang1, Frederic Skoczylas2

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.9, pp. 2417-2430, 2023, DOI:10.32604/fdmp.2023.030028

    Abstract The design of an underground nuclear waste disposal requires a full characterization of concrete under various thermo-hydro-mechanical-chemical conditions. This experimental work studied the characterization of coupled thermo-hydro-mechanical effects using concretes made with cement CEM I or CEM V/A (according to European norms). Uniaxial and triaxial compression under 5 MPa confining pressure tests were performed under three different temperatures (T = 20°C, 50°C, and 80°C). The two concretes were dried under relative humidity (RH) to obtain a partially saturated state of approximately 70%. The results showed that the effects of water saturation and confining pressure are… More >

  • Open Access

    ARTICLE

    Study on Strength Reduction Law and Meso-Crack Evolution of Lower Layered Cemented Tailings Backfill

    Huazhe Jiao1,2,3, Wenxiang Zhang1,2,3,*, Yunfei Wang1,2,3,*, Xinming Chen1,2,3, Liuhua Yang1,2,3, Yangyang Rong1,2,3

    Journal of Renewable Materials, Vol.11, No.3, pp. 1513-1529, 2023, DOI:10.32604/jrm.2023.026008

    Abstract The green disposal of tailings solid waste is a problem to be solved in mine production. Cemented tailings filling stoping method can realize the dual goals of solid waste resource utilization and mined-out area reduction. However, the volume of the mined-out area of the open-pit method is larger than the filling capacity, resulting in the complex stratification of the underground backfill, and the strength of the backfill cannot meet the requirements. In this paper, according to the delamination situation, the specimens of horizontal and inclination angle layered cemented tailings backfill (LCTB) is made for a… More >

  • Open Access

    ARTICLE

    Study on Acoustic Emission Characteristics of Self-Compacting Concrete under Uniaxial Compression Test

    Yongshuai Sun1,*, Guihe Wang2, Yixuan li2

    Journal of Renewable Materials, Vol.10, No.8, pp. 2287-2302, 2022, DOI:10.32604/jrm.2022.019660

    Abstract To study the relationship between acoustic emission characteristic parameters of self-compacting concrete(SCC) and its destruction evolution, under uniaxial compression, acoustic emission(AE) tests are performed on C30 selfcompacting concrete test blocks that are preserved for 7 days and 28 days, the corresponding relationship among energy, amplitude, ring count and different failure stages of the specimens are analyzed by AE experiment, and the spatial distribution of AE in each stage is described by introducing location map. The test shows that there are two rules for the failure of SCC specimens cured for 7 days and 28 days:… More >

  • Open Access

    ABSTRACT

    Buckling Behavior of Elastic Kelvin Open-Cell Foams Subjected to Uniaxial Compression

    N. Ohno1, D. Okumura1, A. Okada1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.2, pp. 73-80, 2008, DOI:10.3970/icces.2008.008.073

    Abstract This paper describes buckling modes and stresses of elastic Kelvin open-cell foams subjected to uniaxial compressions. Cubic unit cells and cell aggregates in model foams are analyzed using a homogenization theory. The analysis is performed on the assumption that the struts in foams have a non-uniform distribution of cross-sectional areas as observed experimentally. By performing the analysis based on the uniformity of strut cross-sectional areas, it is shown that the non-uniformity of cross-sectional areas is an important factor for the buckling behavior of open-cell foams. More >

  • Open Access

    ARTICLE

    Confinement Effect of Woven Roving Glass Fabric on Concrete Specimen

    Smitha Gopinath1,2, A. Ramachandra Murthy1, Bhaskar Srivastava1, V. Ramesh kumar1, Nagesh R. Iyer1

    CMC-Computers, Materials & Continua, Vol.27, No.1, pp. 73-100, 2012, DOI:10.3970/cmc.2012.027.073

    Abstract The present study investigates the behavior of concrete specimens confined with woven roving glass fabrics under uniaxial compression. The fabric made up of 360G.S.M. woven roved E-glass is embedded in a polyester resin before application. Experimental investigations have been carried out on confined and unconfined concrete specimens of size 150 mm (diameter) X 300 mm (height) under a displacement controlled loading. The effect of number of layers on confinement has also been investigated. Load versus deflection plots have been obtained for all the specimens. Numerical studies have been performed on the confinement effect of the… More >

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