Analytical study of ground motion caused by seismic wave propagation across faulted rock masses

Li, J.C.; Li, N.N.; Chai, Shaobo; Li, H.B.

doi:10.1002/nag.2716

Cited by 22 publications

(5 citation statements)

References 25 publications

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“…Технологии комбинируемых по критериям надежности и стоимости управления состоянием массива способствуют восстановлению промышленного потенциала Садонских месторождений [Дмитрак и др., 2006, 2019 [Feng, 2017;Jianju et al, 2017;Li, 2017;.…”

Section: K = (E м -E о ) /E о =E Y /E о unclassified

Geophysical monitoring of the development of stress-deformed ore massives

Голик¹,

Бурдзиева²,

Дзеранов³

2021

Геология И Геофизика Юга России

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Рассмотрены актуальные вопросы рационализации природопользования, включающие в себя установление величины и закономерностей экологического риска технологических процессов, оценку процессов коммуникации техногенных продуктов и прогнозирование экологической зависимости биоты от горного производства при подземной разработке месторождений Садонского рудного узла. Целью исследований является определение форм взаимодействия природных и технических систем, определяющих параметры геомеханики участка земной коры в районе освоения недр путем исследования напряженно-деформированного состояния массивов для разработки приемлемых вариантов добычи металлических руд. Методы исследования. Приведены результаты моделирования состояния рудовмещающих массивов на оптически активных материалах. Предложен коэффициент надежности для оценки безопасности горных технологий по развитию критических напряжений и деформаций. Результаты работы. Установлена адекватная зависимость между характером силового воздействия на природные и искусственные массивы и их устойчивостью с корреляцией между напряженностью массива и сохранностью земной поверхности, как гаранта безопасности экосистем биосферы. Даны результаты моделирования напряженности массива методом конечных элементов, распределения давления по контуру выработки на крепь и исследования фильтрационной неоднородности руд. Обобщены результаты анализа ретро-и перспектив развития способов управления состоянием массивов при разработке месторождений. Сделан вывод о возможности обеспечения оптимального соотношения напряжений в элементах геомеханической системы геофизическими методами в рамках мониторинга состояния горного массива и подземных выработок. В совокупности рекомендации представляют собой программу выхода горных предприятий региона из затяжного кризиса и восстановления былого потенциала одного из флагманов цветной металлургии, реализация которой формирует экономический, экологический и социальный эффект в условиях депрессивного промышленного региона. Topical issues of rationalization of nature management are considered, including the establishment of the magnitude and regularities of the ecological risk of technological processes, the assessment of the communication processes of technogenic products and the prediction of the ecological dependence of biota on mining during the underground development of the deposits of the Sadonsky ore cluster. The Aim of the research is to comprehensively study the interaction of natural and technical systems that ensure the geomechanical balance of massifs in the area of subsoil development by systematic monitoring of the stress-strain state of the massifs using the methods of complex generalization, analysis of practical experience and scientific achievements in the field of underground ore mining in the massifs. Complex structure, theory and practice of destruction of solid media by means of continuum mechanics and mathematical statistics with the development of economically and environmentally acceptable options for the extraction of metal ores. Methods. The results of modeling the state of ore-bearing massifs on optically active materials are presented. A reliability factor is proposed for assessing the safety of mining technologies for the development of critical stresses and deformations. Results. An adequate relationship has been established between the nature of the force impact on natural and artificial massifs and their stability with the correlation between the strength of the massif and the safety of the earth's surface, as a guarantor of the safety of biosphere ecosystems. The results of modeling the tension of the massif by the finite element method, the distribution of pressure along the contour of the excavation on the support and the study of the filtration heterogeneity of ores crushed for leaching purposes according to the propagation velocity of stress waves are given. The results of the analysis of retro- and prospects for the development of methods for managing the state of rock mass in the development of fields are generalized. A conclusion is made about the possibility of ensuring the optimal stress ratio in the elements of the geomechanical system by geophysical methods within the framework of monitoring the state of the rock mass and underground workings. Taken together, the recommendations represent a program for the recovery of the region's mining enterprises from a protracted crisis and the restoration of the former potential of one of the flagships of non-ferrous metallurgy, the implementation of which creates an economic, environmental and social effect in a depressed industrial region.

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Section: K = (E м -E о ) /E о =E Y /E о unclassified

Geophysical monitoring of the development of stress-deformed ore massives

Голик¹,

Бурдзиева²,

Дзеранов³

2021

Геология И Геофизика Юга России

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“…Most used parameter, which is fixed experimentally and determined theoretically, is the velocity of oscillations (landslides) in the mass of protected object [9]. However, it is known that duration of different dynamic or other loads on mine workings, civil and industrial objects has a significant impact on the ultimate strength characteristics [11], [12], as well as degree of deformation and destruction of rocks influenced by seismic blast waves [13].…”

Section: Introductionmentioning

confidence: 99%

Blast wave interaction during explosive detonation in a variable cross-sectional charge

Ishchenko,

Novikov,

Ponomarenko

et al. 2024

Min. miner. depos.

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Purpose. The research aims to assess the efficiency and performance of solid media destruction in directed blasting of a charge with variable cross-sectional shape. Methods. Numerical modelling of the blast wave interaction process is performed using the finite element method based on the Euler-Lagrange algorithm. The Johns-Wilkins-Lee equation of state is used to determine the pressure-volume dependences of medium destruction. Assessment of solid medium destruction mechanism during a directed blasting of a charge with variable cross-sectional shape is carried out based on polarization-optical method on models made of optically active material. Findings. Experimental studies of solid medium destruction by the action of directed blasting with a variable cross-section charge made it possible to determine the direction of blast wave propagation and its amplitude in stress wave, influencing the intensity of radial crack network formation in superposition areas, and directed perpendicularly to explosive cavity. At the same time, the average peak pressure in collision zone of two shock waves in centre of spherical cavity is approximately 1.48 and 1.84 times higher than that in weakly blast-loaded areas. It has been found that when two shock waves collide and superimpose on each other, the intensity of their impact increases. Moreover, the shock wave velocity in collision zone is higher than that of the radial shock wave. Originality. It has been determined that the maximum pressure values on the explosive cavity wall at the initiation points sharply increase and then gradually stabilize as the blast stress waves propagate and have an arbitrary distribution pattern. Three areas should be considered: not superimposed, weakly superimposed, and strongly superimposed. At each point of detonation, the pressure on explosive cavity wall will be minimal, while in the charge centre in the spherical insert zone, on the contrary, it will be maximal. In this case, the pressure in the central superposition area is about 2.84 times greater than at the initiation ends, and the nature of distribution changes according to a linear dependence. Practical implications. The performed research findings can serve as a basis for development of effective parameters of resource-saving methods for stripping hard rocks of complex structure in the conditions of ore mines.

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“…After exposure to high temperatures, the rock structure, basic mechanical behavior characteristics, and engineering response have undergone fundamental changes. The disasters induced by high temperatures bring great challenges to rock engineering. − The drilling and blasting method is often used for rock excavation, so it is inevitable to consider the propagation and attenuation of stress wave in rock mass and the deformation and failure of rock mass under dynamic load. − The wave impedance reflects the ability of the material medium to prevent a wave from passing through. It is an important physical quantity to characterize the dynamic properties of the medium.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Influence of Wave Impedance on Dynamic Mechanical Response of Granites undergone High Temperature

Li,

Fang,

Gao

2023

ACS Omega

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Wave impedance is an important physical quantity to characterize the dynamic properties of materials. To explore the influence of wave impedance on the dynamic mechanical response of rock, the granite samples with a wave impedance gradient change are obtained by changing the heating temperature, and the impact compression test is carried out by using a split Hopkinson pressure bar (SHPB) device. The stress wave propagation law, dynamic stress−strain relationship, and fracture characteristics of rocks with different wave impedances are studied comparatively, and the influence mechanism of wave impedance on the dynamic mechanical response of rocks is comprehensively analyzed from two aspects of material properties and dynamics. The results show the following: (1) Under the action of the same incident wave, the reflected wave amplitude, transmission wave takeoff time, peak stress, peak strain, and equivalent average size of fragments of granite samples with different wave impedances are significantly different. ( 2) As the heating temperature increases, the wave impedance of granite continuously decreases and the degree of damage intensifies. Within the high-temperature treatment range of 400 to 600 °C, there is a damage wave impedance threshold between 7854 and 3081 g•cm −3 •m•s −1 . Below this wave impedance, granite will appear to have significant damage deterioration. (3) Under the same incident wave, the strain rate and loading rate of granite samples show negative correlation and positive correlation with wave impedance, respectively. There is a progressive relationship between rock wave impedance, stress wave propagation, strain rate history/stress history, and dynamic mechanical response.

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Analytical study of ground motion caused by seismic wave propagation across faulted rock masses

Cited by 22 publications

References 25 publications

Geophysical monitoring of the development of stress-deformed ore massives

Geophysical monitoring of the development of stress-deformed ore massives

Blast wave interaction during explosive detonation in a variable cross-sectional charge

Experimental Investigation on the Influence of Wave Impedance on Dynamic Mechanical Response of Granites undergone High Temperature

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