Novel application of β/γ autoradiography and collimated γ-spectrometry to study in situ radionuclide migration paths in fractured rock

We report on a new mobile γ-spectrometry system (AMESOS) developed at the University of Athens. The system aims at carrying out in situ measurements to study distributions of NORM and TENORM at harsh environments or where sampling is difficult. AMESOS has been characterized by using standard calibration sources and minerals of known, independently determined, U and Th concentrations. Simulations of the system have been performed with MCNP and Geant4. As a proof of good field operation, AMESOS was deployed in a series of measurements at Mt. Kithaeron, near Athens, extending earlier data and estimating absorbed dose rates that concern the public.

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Fractured rock stress-permeability relationships from in situ data and effects of temperature and chemical-mechanical couplings

Crustal Permeability ◽

10.1002/9781119166573.ch8 ◽

2016 ◽

pp. 65-82

Author(s):

Jonny Rutqvist

Keyword(s):

Fractured Rock ◽

Rock Stress ◽

In Situ Data ◽

Effects Of Temperature

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In situ field method for evaluating biodegradation potential of BTEX by indigenous heterotrophic denitrifying microorganisms in a BTEX-contaminated fractured-rock aquifer

Environmental Technology ◽

10.1080/09593330.2019.1668482 ◽

2019 ◽

pp. 1-10

Author(s):

Kyungjin Han ◽

Uijeon Hong ◽

Sunhwa Park ◽

Sooyoul Kwon ◽

Young Kim

Keyword(s):

Fractured Rock ◽

Field Method ◽

Denitrifying Microorganisms ◽

Fractured Rock Aquifer

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Study on Support of Roadways in Fractured Rock Mass under Mining-Induced Stresses

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.807-809.2332 ◽

2013 ◽

Vol 807-809 ◽

pp. 2332-2339

Author(s):

Qiang Wang ◽

Jin Yu Chen

Keyword(s):

Rock Mass ◽

Abutment Pressure ◽

Underground Mining ◽

Fractured Rock ◽

The State ◽

In Situ Monitoring ◽

Initial Stresses ◽

Induced Stresses ◽

The Stability

One of the difficult issues in underground mining is the ground control of roadway subject to mining induced stresses. As a longwall face advances, the state of initial stresses dramatically changes. Accordingly, lateral abutment pressure forms on the pillar and frontal abutment pressure on the roof and lateral sides of the roadway. These pressures will lead to severe deformation and deterioration of the rock mass surrounding the entries. In this paper, a systemic study on this issue is proposed using the combination of numerical modeling and in-situ monitoring which was carried out at a coal mine in the Lu.An Group, China. The condition of stress redistribution caused by mining-induced stresses and the state of the surrounding rock mass of the roadway situated in front the work face are systematically investigated. Different patterns of support and reinforcement as well as their effects on the stability of the roadway are also presented.

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