Preliminary Design of a Trench Cutter System for Deep-Sea Mining Applications Under Hyperbaric Conditions

Spagnoli, Giovanni; Miedema, S.A.; Herrmann, Christian; Rongau, Johann; Weixler, Leonhard; Denegre, Julien

doi:10.1109/joe.2015.2497884

Cited by 25 publications

(15 citation statements)

References 14 publications

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“…Other discrete element-based methods have been considered too time consuming and resource demanding, as each block would require a separate study for itself (examples of such studies in [28][29][30]). In addition, Miedema's model gives results similar to hyperbaric rock cutting experiments [24] and has been used for the preliminary design of trenching equipment [31]. Using Miedema's convention, the E sp can be expressed as a function of the horizontal cutting forces, F h , the depth of cut trench, h i , and the width of the blade, w:…”

Section: Specific Energymentioning

confidence: 97%

Economic Block Model Development for Mining Seafloor Massive Sulfides

2018

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To support open-pit studies related to seafloor massive sulfides mining projects, an economic block-model is required. A modular framework is proposed to produce economic block models accommodating various levels of data. The framework is illustrated on a site of interest located on the Arctic Mid-Ocean Ridge. Random sampling based on literature datasets is performed to assign grades, porosity and grain density to the model. Other required parameters are produced using relationships found in the literature. Revenues are estimated using literature values within a net smelter return methodology. Mining costs are determined using the cost of a mining system and the estimated time required for excavating the ore. The excavating time is assessed through the specific energy for the ore and the mining machines. The specific energy is calculated with a hyperbaric rock-cutting model. An economic block value of each mining block is then provided. The mining block database resulting from the study constitutes a valuable input into further studies on resource development. The framework has also been used to support a sensitivity study. The availability of the marine assets has been found as having the greatest influence on the economic value of the study case.

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Section: Specific Energymentioning

confidence: 97%

Economic Block Model Development for Mining Seafloor Massive Sulfides

2018

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“…The SMS are distributed in the depth range of 1500-3600 m under the sea water [30,31], and the high confining pressure of its surroundings is different from that in the air. Under the condition of high hydrostatic pressure, the rocks are in the high-pressure state of three-dimensional stress, and a ductile cutting process usually occurs in the rock fracture [19,30,32].…”

Section: Tcs Simulationmentioning

confidence: 99%

Mechanical Tests and Numerical Simulations for Mining Seafloor Massive Sulfides

Dai

Zhu

et al. 2019

JMSE

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With the decrease of primary resources in recent years, deep seabed mineral resources, especially the massive sulfides, are of extensive research significance. In this paper, firstly, the uniaxial compressive strength (UCS) test and triaxial compressive strength (TCS) test on the seafloor massive sulfides (SMS) samples from three different segments are conducted to obtain the key mechanical properties, including the cohesive force, internal friction angle, compressive strength, elastic modulus and Poisson’s ratio. Then, by leveraging the PFC3D code, the uniaxial and triaxial numerical simulations of SMS are performed. During this process, the micro properties in the simulation are altered through a calibration process until they match the macro properties of the SMS samples measured in the laboratory tests. Finally, the micro properties are applied to simulate the cutting process of single cutting pick and two adjacent cutting picks; meanwhile, the cutting force in the fragmentation process of SMS is monitored and collected. This research can provide some guidance for the mining simulation of SMS and effectively predicting the maximum force on the cutting pick.

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“…In literature, different methods of excavation and rising techniques have been introduced. For the excavation part, [11] has designed a vertical mining approach using a trench cutter and a hydraulic grabber has been designed by [12]. In addition to the ongoing research activities, a few companies have been working on this concept.…”

Section: Deep-sea Mining Processmentioning

confidence: 99%

Investigation of AC and DC power distributions to seafloor mining equipment

Fard

Tedeschi

2017

OCEANS 2017 - Aberdeen

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The main goal of this paper is to study and compare different power distribution alternatives for subsea electrical components for deep-sea mining in the Norwegian Sea. Such application requires power delivery in the multi-MW range at water depth of more than 3000 m. Hence, AC (50Hz), DC, high frequency AC and low frequency AC can be possible options to transfer electrical power to the mining equipment. Comparing them at the preliminary stages of projects is beneficial in order to select the most suitable alternative. Minimizing voltage drop and distribution losses, in addition to reducing the number of components, their weight and cost are critical and often conflicting aspects, to design the electrical system appropriately. In this paper, the basic processes of deepsea mining (regarding Seafloor Massive Sulfides) will be described briefly. In addition, an estimation of the amount of required power to feed the subsea mining equipment for the Norwegian Sea case will be given and finally, different power distribution schemes will be analyzed and compared, using the PowerFactory/DIgSILENT software for simulations.

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Preliminary Design of a Trench Cutter System for Deep-Sea Mining Applications Under Hyperbaric Conditions

Cited by 25 publications

References 14 publications

Economic Block Model Development for Mining Seafloor Massive Sulfides

Economic Block Model Development for Mining Seafloor Massive Sulfides

Mechanical Tests and Numerical Simulations for Mining Seafloor Massive Sulfides

Investigation of AC and DC power distributions to seafloor mining equipment

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