Mapping fracture zones in salt: High‐resolution, cross‐gallery seismic tomography

Jung, Yong‐Bok; Ibrahim, Abdelwahid; Borns, David James

doi:10.1190/1.1436816

Cited by 5 publications

(3 citation statements)

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“…Elbring et al, 1989), para estudo de depósitos de rejeitos radiativos (e.g. Jung et al, 1991) ou mesmo para fins de engenharia (e.g. Sassa, 1988).…”

Section: Determinação De Constantes Elásticas In Situunclassified

Fonte sísmica de pequeno diâmetro para ensaios entre furos de sondagens ("Crosshole")

Taioli¹

2001

Rev. Bras. Geof.

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Em aplicações ligadas à área de engenharia civil, o ensaio "crosshole" (entre furos) é o método mais utilizado para determinação das propriedades elásticas dos maciços por intermédio da medida das velocidades de propagação das ondas P e S. Por outro lado, seu uso tem sido limitado somente a grandes obras, devido principalmente, aos custos envolvidos na sua execução. Isto é devido, principalmente, à necessidade da perfuração de furos especiais para acomodar os equipamentos utilizados. Com vistas a diminuir tais custos, foi desenvolvida uma fonte sísmica, de pequeno diâmetro e de baixo custo, possível de ser utilizada nos furos de sondagem normalmente executados para os ensaios SPT (Standard Penetration Test), durante a fase de investigação em solos. O diâmetro externo máximo desta fonte é de 40 mm, o que permite instalá-la em revestimentos com 50 mm de diâmetro externo (46 mm interno). Dessa forma, o revestimento pode ser facilmente instalado em furo com 75 mm (3") de diâmetro máximo, permitindo, também, o preenchimento do espaço anelar com calda de cimento. A fonte sísmica é fixada na parede do revestimento por meio de um sistema pneumático e, por meio de um êmbolo deslizante gera principalmente ondas S. O uso dessa fonte em diversas obras tem evidenciado sua praticidade devida mormente ao seu pequeno tamanho e baixo peso.Palavras-chave: Fonte sísmica; Ensaio entre furos; Estudo geotécnico. SMALL SIZE SHEAR WAVE SOURCE FOR CROSSHOLE TESTS -In civil engineering applications, the crosshole test is the most utilized method to determine the propagation velocities of in situ P and S waves of the different

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“…Elbring et al, 1989), para estudo de depósitos de rejeitos radiativos (e.g. Jung et al, 1991) ou mesmo para fins de engenharia (e.g. Sassa, 1988).…”

Section: Determinação De Constantes Elásticas In Situunclassified

Fonte sísmica de pequeno diâmetro para ensaios entre furos de sondagens ("Crosshole")

Taioli¹

2001

Rev. Bras. Geof.

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“…To increase confidence in estimates of time-to-collapse, it is useful to consider (1) measuring load deformation properties for threaded rebar under combined axial and lateral loading conditions and (2) evaluating pillar stability through analyses of stress (Maleki and Hollberg 1995), strain, or possibly wave propagation characteristics (Jung 1991;Maleki and Hollberg 1995).…”

Section: Anticipated Time For Transferring Roof Loads To the Wastementioning

confidence: 99%

Mine stability evaluation of panel 1 during waste emplacement operations at WIPP

Maleki¹

1998

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EEG performs independent technical analyses of the suitability of the proposed site; the design of the repository, its planned operation, and its long-term integrity; suitability and safety of the transportation systems; suitability of the Waste Acceptance Criteria and the generator sites' compliance with them; and related subjects. These analyses include assessments of reports issued by the DOE and its contractors, other federal agencies and organizations, as they relate to the potential health, safety and environmental impacts from WIPP. Another important fhction of EEG is the independent environmental monitoring of background radioactivity in air, water, and soil, both Since there are 10 panels in the repository (two of them in the N-S access drifts), and the total CH-TRU waste capacity of the repository is 168,500 m3, each panel will have about 17,000 m3 of waste. Thus, 2,364 shipments are required to fill a panel, including the drifts north and south of the rooms. The shipments in Table 5 The limitations and uncertainties not considered in this projection include the delay in RCRA certification, limitations imposed by the DOE having only 15 TRUPACTS on 5 trailer trucks at this time until more are ordered, and the delay from the anticipated lawsuits. This can easily add one year to the schedule for Room 7, and perhaps another year or two to the schedule for panel 1 as a whole.In summary, therefore, we suggest that you assume one year for Room 7, and 4 years for the full Panel 1 as the optimistic schedule, and 7 years for the full panel as an alternate schedule.The EEG requested Dr. Maleki to address specific questions related to the stability of the Panel 1 rooms in his evaluation this year and what should be done to make operations in these rooms safe given the DOE decision to not abandon these rooms. Dr. Maleki's analysis shows that after a tertiary roof support system is emplaced in a room of Panel 1, the potential for roof falls is expected to be low during the first year, but will increase significantly two years after the installation of such a system. The postulated failure mechanism is the shear failure of the roof bolts due to lateral movement along Clay G approximately 7 ft above the roof of the room. During the waste vi emplacement operations it will not be possible to replace the failing bolts in areas containing waste, resulting in a domino effect of failing roof bolts, which will lead to roof instability. Room # 7 was outfitted with a tertiary roof support system in April 1998, when the one or two year clock for that room began.Dr. Maleki recommends using the external support system, e.g. columns of timber called "cribs", in addition to the internal support system of roof bolts to be instailed just before waste emplacement in a given room, to increase confidence in the stability of these rooms. He calculates that ifboth the internal and the external support systems are used and the rate of convergence of the roof does not accelerate, then the roof loads will most likely not be transferred to th...

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“…[1][2][3][4][5][6][7][8][9]) and the mining industry (e.g. [10][11][12][13][14][15][16][17]). These include the detection of fractures in rocks, monitoring the changing conditions of reservoirs, delineating mineralisation, among others.…”

Section: Introductionmentioning

confidence: 99%

The potential of seismic cross-hole tomography for geotechnical site investigation

Danovan

2019

E3S Web Conf.

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Seismic cross-hole tomography has been commonly used in oil and gas exploration and the mining industry for the detection of precious resources. For near-surface geotechnical site investigation, this geophysical method is relatively new and can be used to supplement traditional methods such as the standard penetration test, coring and sampling, thus improving the effectiveness of site characterization. This paper presents a case study which was carried out on a reclaimed land in the Eastern region of Singapore. A seismic cross-hole test was performed by generating both compressional waves and shear waves into the ground. The signals were interpreted by using first-arrival travel time wave tomography and the arrival times were subsequently inverted using Simultaneous Iterative Reconstruction Technique (SIRT). A comparison with the borehole logging data indicated that P-wave velocity model cannot provide sufficient information about the soil layers, especially when the ground water table is near the surface. The S-wave velocity model seemed to agree quite well with the variation in the SPT-N value and could identify to a certain extent the interface between the different soil layers. Finally, P-wave and S-wave velocities are used to compute the Poisson's ratio distribution which gave a good indication of the degree of saturation of the soil.

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Mapping fracture zones in salt: High‐resolution, cross‐gallery seismic tomography

Cited by 5 publications

References 0 publications

Fonte sísmica de pequeno diâmetro para ensaios entre furos de sondagens ("Crosshole")

Fonte sísmica de pequeno diâmetro para ensaios entre furos de sondagens ("Crosshole")

Mine stability evaluation of panel 1 during waste emplacement operations at WIPP

The potential of seismic cross-hole tomography for geotechnical site investigation

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