Publications
224 results found
Latham JP, Munjiza A, Lu Y, 2002, On the prediction of void porosity and packing of rock particulates, POWDER TECHNOLOGY, Vol: 125, Pages: 10-27, ISSN: 0032-5910
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- Citations: 62
Latham JP, 2002, Porosity and Packing Simulations of Particles with any Shape or Size – Dynamic 3D results from Combined Discrete Finite Element Models, International Conference on Coastal Engineering, Publisher: ASCE
Munjiza A, Latham JP, 2002, Grand challenge of discontinuous deformation analysis, 5th Int. Conf. on Analysis of Discontinuous Deformation
Newberry SD, Latham JP, Stewart TP, 2002, The effect of rock “blockiness”, aspect ratio and construction methods on the properties of rock armour layers, International Conference on Coastal Engineering, Publisher: ASCE
Stewart TP, Newberry SD, Latham JP, et al., 2002, The Hydraulic Performance Of Tightly Packed Rock Armour – Results From Random Wave Model Tests Of Armour Stability And Overtopping., International Conference on Coastal Engineering, Publisher: ASCE
Latham J-P, Lu Y, Munjiza A, 2001, A random method for simulating loose packs of angular particles using tetrahedra, Géotechnique, Vol: 51, Pages: 871-879, ISSN: 0016-8505
Latham JP, Lu Y, Munjiza A, 2001, A random method for simulating loose packs of angular particles using tetrahedra, GEOTECHNIQUE, Vol: 51, Pages: 871-879, ISSN: 0016-8505
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- Citations: 44
Latham JP, Newberry SD, Mannion M, et al., 2001, The void porosity of rock armour in coastal structures with reference to measurement and payment issues, International Conference on Coastal Engineering, Publisher: ASCE
Munjiza A, Latham JP, Andrews KRF, 2000, Detonation gas model for combined finite‐discrete element simulation of fracture and fragmentation, International Journal for Numerical Methods in Engineering, Vol: 49, Pages: 1495-1520, ISSN: 0029-5981
Munjiza A, Latham JP, Andrews KRF, 2000, Detonation gas model for combined finite-discrete element simulation of fracture and fragmentation, International Journal for Numerical Methods in Engineering, Vol: 49, Pages: 1495-1520, ISSN: 0029-5981
The equation of state for expansion of detonation gas together with a model for gas flow through fracturing solid is proposed and implemented into the combined finite-discrete element code. The equation of state proposed enables gas pressure to be obtained in a closed form for both reversible and irreversible adiabatic expansion, while the gas flow model proposed considers only ID compressible flow through cracks, hence avoiding full 2D or 3D gas flow through the fracturing solid. When coupled with finite-discrete element algorithms for solid fracture and fragmentation, the model proposed enables gas pressure to be predicted and energy balance to be preserved. Copyright © 2000 John Wiley & Sons, Ltd.
Munjiza A, Latham JP, John NWM, 2000, Detonation gas model for the combined finite-discrete element simulation of fracture and fragmentation, International Journal for Numerical Methods in Engineering, Vol: 49, Pages: 1495-1520
Lu Y, Munjiza A, 2000, Element assembly of angular particles for packing simulations, 8th Annual UK Conference of the Association for Computational Mechanics in Engineering
Latham JP, Lu P, 1999, Development of an assessment system for the blastability of rock masses, International Journal of Rock Mechanics and Mining Sciences, Vol: 36, Pages: 41-55, ISSN: 1365-1609
Intact rock properties and the discontinuity structure of a rock mass are among the most important variables influencing blasting results. This influence is considered to be a composite intrinsic property of a rock mass and is referred to as the blastability of a rock mass. It represents the ease with which a rock mass can be fragmented by blasting. This paper outlines an energy-block-transition model, recently proposed by the authors for characterising the blast process. A preliminary validation of this model using two sets of field data from the literature is briefly outlined. The model is comparable or better than Bond's comminution theory at predicting blasting results for cases where intrinsic rock properties are relatively constant. To generate a predictive capability for the model, a blastability designation BD, is designed which reflects the intrinsic resistance of the rock mass to blasting. The quantification of BD, based on rock engineering systems approaches and consideration of a comprehensive range of intact rock properties and discontinuity structures is illustrated. A case study is given which applies the model and the associated assessment system to a highway cutting site. Confidence as to the potential value of the assessment system and the model is obtained since refinement and improvement on pre-existing models can be seen from the new preliminary results.
Latham JP, Munjiza A, Lu P, 1999, Rock fragmentation by blasting - a literature study of research in the 1980's and 1990's, Fragblast, Vol: 3, Pages: 193-212, ISSN: 1385-514X
When blasting rock, interactions occur between rock mass properties, explosives properties, blasting geometry and the detonation timings. A more optimized use of resources requires a better understanding of these interactions. Innovative algorithmic tools for use in complex numerical models are required and the results of such models are needed to inform us of both the physics of blasting and the modelling method limitations. Many further refinements and 2D to 3D generalizations are required for isotropic rock properties before the complexity of realistic rock mass properties can be introduced. The recognized importance of better rock structure characterization and assessment of in-situ block size distributions has promoted promising new empirical approaches. In this broad context, the paper will attempt to chart recent research in the understanding of rock blasting processes drawing upon the work of researchers worldwide. The authors' own contributions to: numerical modelling of dynamic fracture and fragmentation with coupled detonation gas expansion, swell and muckpile formation, in-situ block size and rock mass characterization, blastability and empirical energy-based blast design models, will also be highlighted.
Munjiza A, Latham J-P, Andrews KRF, 1999, Challenges of a coupled combined finite-discrete element approach to explosive induced rock fragmentation, FRAGBLAST - Intl. J. Fragmentation and Blasting, Vol: 3-4, Pages: 237-250
Latham JP, Lu P, 1999, Development of an assessment system of blastability for rock masses, International Journal of Rock Mechanics and Mining Sciences, Vol: 36, Pages: 41-55
Latham JP, Munjiza A, 1999, Components in an understanding of rock blasting, KEYNOTE ADDRESS, 6th International Symposium for rock fragmentation by blasting, Publisher: SIAMM, Pages: 173-182
Lu P, Latham JP, 1999, Developments in the assessment of in-situ block size distributions of rock masses, Rock Mechanics and Rock Engineering, Vol: 32, Pages: 29-49
Munjiza A, Latham JP, Andrews K, 1999, Detonation gas model for coupled analysis of explosive induced rock fragmentation, 6th International Symposium for rock fragmentation by blasting, Pages: 183-186
Latham JP, Munjiza A, Lu P, 1999, Rock fragmentation by blasting - a literature study of research in the 1980's and 1990's, The International Journal for Fragmentation and Blasting, Vol: 3, Pages: 1-20
Lu P, Latham JP, 1999, Investigation into the relation between fractal dimension and the blastability of rock masses, 6th International Symposium for rock fragmentation by blasting, Publisher: SIAMM, Pages: 191-198
Munjiza A, Latham JP, Andrews A, 1999, Rock fracture and fragmentation model in coupled analysis of explosive induced rock fragmentation, 6th International Symposium for rock fragmentation by blasting, Publisher: SIAMM, Pages: 187-190
Latham JP, Hoad JP, Newton M, 1998, Abrasion of a series of tracer materials on a gravel beach, Slapton Sands, Devon, UK, Advances in Aggregates and Armourstone Evaluation. Geological Society Engineering Geology Special Publication No.13., Pages: 121-135
While increased attention is being paid to the use of quarried rock in groynes, revetments and breakwaters, and to beach recharge, the large volumes of materials and the associated environmental costs of obtaining these resources has begun to focus minds. Interest in the possible future use of a wider range of material sizes and qualities for beach recharge and in the use of smaller armour block sizes which move during profile adjustment has been growing. Deployment of these dynamic materials for coastal protection structures has focussed research on the long-term performance of these materials and the implications for design life. This reflects a growing concern about the more intelligent use of finite material resources. The vast range in intrinsic resistance of different rock types to laboratory mill abrasion is well reported and these results, when presented as the QMW mill abrasiion resistance index, can give relative lifetimes of differing shingle types. However, field studies and/or degradation models of the type discussed in this paper are needed to convert these relative laboratory lifetimes to prototype environmental lifetimes in years so that they are appropriate for predicting the long-term changes in beach material volumes. The author's 1991 rock degradation model, which gives an absolute prediction of weight loss rates was proposed for armourstone placed within structures designed for static stability. It encorporates the mill abrasion test result for the rock type in question. However, it also attempts to embrace dynamically stable rock protection structures from gravel beaches up to berm breakwaters, depending on the mobility parameter. Before this laboratory and field study, no prototype data was available to check its applicability to gravel-sized material. This paper presents the field results for pebbles consisting of three rock types. Their rates of weight loss with respect to interactions with indigenous beach materials in both laboratory and f
Latham JP, 1998, Assessment and specification of armourstone quality: From CIRIA/CUR (1991) to CEN (2000), Geological Society Engineering Geology Special Publication, Vol: 13, Pages: 65-85, ISSN: 0267-9914
As a typical by-product to normal quarrying, armourstone has many attributes that make its objective specification and testing less straightforward than most producers would wish. Neither, it appears, has the market forces principle and tendering practices in the UK construction industry, leading to minimal forward planning of armourstone testing, helped to enhance quality control of materials. The undoubted advances heralded by the standardizing approach of the CIRIA/CUR Manual on the Use of Rock in Coastal and Shoreline Engineering and its model specification have done much to rationalize a previously over-simplistic view of armourstone specification. However, recent practical experience with many coastal contracts which have adopted the CIRIA/CUR specification has exposed a number of problems with the detailed implementation of the rock quality testing part of the model specification. In particular, this experience draws attention to a lack of published correlation studies between the various abrasion tests and between strength tests. Rock suppliers are reporting that designers are continuing to specify using the BS812 suite of aggregate tests. The potential for bias in the taking and preparation of representative test portions has also remained a problem. The manual specification's rationale, its strengths and weaknesses, are outlined. Correlation analysis of new research data from a suite of rocks is presented. A re-examination of the manual specification's acceptance criteria for resistance to wear and to breakage is presented. A way forward is offered for the continued use of the manual specification until its supersedence by the European CEN specification for armourstone. Improvements in the 16th draft of the CEN standard are briefly discussed, and it is found that certain problems that the manual began to address remain unsolved.
Lu P, Latham JP, 1998, A model for the transition of block sizes during fragmentation blasting of rock masses, Fragblast, Vol: 2, Pages: 341-368, ISSN: 1385-514X
The fragmentation blasting of a rock mass is looked upon as a process of transition from in-situ to blasted block size resulting from the application of explosive energy. The intrinsic material resistance to blast fragmentation offered by the rock mass determines the amount of energy required for the transition and thus determines its blastability. A simple Energy-Block-Transition model with an associated Energy-Block-Transition coefficient Bi reflecting the blastability of the rock mass is proposed. According to the model, the required explosive energy multiplied by Bi is given by the difference between the means of in-situ and blasted block sizes divided by an objective size characterizing the fineness of blocks associated with the overall transformation process. A preliminary evaluation of the model using two sources of published data where intrinsic rock properties are considered to be relatively constant shows the new model to be comparable with or better than Bond's Comminution Theory at predicting blasting results. To generate a predictive capability for the Energy-Block-Transition model, Bi associated with different rock mass is required. A blastability designation BD, which is devised to quantify the influence of a comprehensive range of intact rock and discontinuity properties based on Rock Engineering Systems approaches is briefly outlined. A tentative relation between Bi and BD is presented which enables a comparison to be made between various blast prediction models and the Energy-Block-Transition model for full-scale blasts on a highway cutting in N Wales.
Latham JP, Hoad JP, Newton M, 1998, Abrasion of a series of tracer materials on a gravel beach, Slapton Sands, Devon, Advances in Aggregates and Armourstone Evaluation, Editors: Latham, Pages: 121-135
Lu P, Latham JP, 1998, A model for the transition of block sizes during blasting, The International Journal for Fragmentation and Blasting, Vol: 2, Pages: 341-368
Latham JP, 1998, Assessment and specification of armourstone quality - from CIRIA/CUR (1991) to CEN (2000), Advances in Aggregates and Armourstone Evaluation, Editors: Latham, Pages: 65-85
Latham JP, Lu P, 1997, Blastability in terms of the transition of block sizes during blasting, Fifth Int. Symposium on Rock Fragmentation by blasting – Fragblast '5
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