Seismic Tomography and Monitoring in Underground Structures: Developments in the Freiberg Reiche Zeche Underground Lab (Freiberg, Germany) and Their Application in Underground Construction (SOUND)

Bohlen, Thomas; Giese, Rüdiger; Heider, S.; Hock, Silke; Jetschny, Stefan; Polom, Ulrich; Wadas, Sonja; Rechlin, Aissa

doi:10.1007/978-3-319-04205-3_7

Cited by 6 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A feature of the EMR field recorded in underground workings using the Angel equipment is that in most cases the registration is carried out under conditions of natural and man-made interference and in the so-called nearest zone of the radiation source, which extends from the source to a distance of up to three wavelengths. A direct analogy here is acoustic emission (AE) technology, a method that has long been used for geophysical monitoring of underground structures [30], as well as sound metering in the form of seismic tomography when monitoring underground structures with a signal generated by a tunnel boring machine [31].…”

Section: Other Possible Causes Of Emr Cyclingmentioning

confidence: 99%

Integrated Interpretation of the Results of Long-Term Geotechnical Monitoring in Underground Tunnels Using the Electromagnetic Radiation Method

et al. 2022

View full text Add to dashboard Cite

Electromagnetic radiation (EMR) technology makes it possible to evaluate changes in the stress-strain state (SSS) in the “tunnel lining-enclosing rock mass” system at a high level of interference, and to create schemes of long-term EMR control in tunnels (geotechnical monitoring systems). The issues of the variations in EMR signals are extremely important for monitoring systems: based on anomalous deviations from the normal regime one can draw conclusions about changes in the SSS, leading to geodynamic phenomena (e.g., rock bursts). This article presents data obtained during laboratory studies on samples and field studies in transport tunnels. Also, some results of long-term geotechnical monitoring by a set of methods is presented: EMR and tensometry of the tunnel lining, both methods are in the automatic mode. The ability of an EMR control system to respond to earthquakes affecting tunnel structures is shown. An analysis of long-term EMR studies was conducted, which showed the periodic oscillation of the “tunnel lining-enclosing rock mass” system. In a stable compressed state, minima of EMR pulses are recorded; when the rock mass and lining material are stretched, charges are separated on the edges of micro-defects and EMR increases; complete separation of the edges of micro-defects leads to the termination of intense EMR. The same occurs in the opposite direction during the compression of micro-defects and micro-fractures in the rock mass and concrete lining. The periods of compression and expansion are closely related to temperature fluctuations. The results differ in detail and, therefore, in to be more confident, additional studies are needed in various host rock massifs and types of tunnel lining.

show abstract

Section: Other Possible Causes Of Emr Cyclingmentioning

confidence: 99%

Integrated Interpretation of the Results of Long-Term Geotechnical Monitoring in Underground Tunnels Using the Electromagnetic Radiation Method

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Experiments to analyze the application of full waveform inversion methods have been performed to detect and locate changes in rock conditions while drill and construction works within the lab Krauß et al (2014) (Krauß et al, 2014). An alternative approach to identify changes in rock condition is the application of coda wave interferometry Lüth et al (2014) (Lueth et al, 2014. Meanwhile several thousands of measurements with permanently xed magnetostrictive actuators were used to transmit seismic waves through the gneiss block.…”

Section: Scienti C Objectivesmentioning

confidence: 99%

GFZ Underground Laboratory in the Research and Education Mine “Reiche Zeche” Freiberg

Giese

Jaksch

2016

JLSRF

Self Cite

View full text Add to dashboard Cite

The GFZ Underground Laboratory is operated by the Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences. It is located in the research and education mine “Reiche Zeche” in Freiberg, Germany allows testing of geophysical and geotechnical tools and methods in boreholes and galleries. The lab is ideally suited for seismic system components such as receivers and sources for three-dimensional high resolution seismic imaging and tomography surveying. The lab layout of a basement rock block surrounded by galleries around a vertical as well as two horizontal boreholes enables the realization of various underground survey geometries e.g. well-to-well and well-to-gallery. The galleries are equipped with thirty 3-component geophone anchors installed in 1 m and 2 m depths for tomographic measurements or the recording of radiation pattern of seismic borehole sources.

show abstract

“…Therefore, the construction of underground complexes with extended tunnels of tens kilometer long and more than 10 m in diameter, machine halls of 50-60 m high and some hundreds meters long, and concrete dams of some hundreds meters high require to monitor their stability during construction works (Savich and Kujundjich 1990). Such monitoring based on geophysical parameters using seismic geotomography, ultrasonic and acoustic emission methods have been carried out during the constructions of the high concrete dam Ingury Hydro Power Station (HPS) (Savich et al 1983), large underground openings (Acrimony et al 1987, Ezersky et al 1991a, 1992, 1993b, Yamamoto and Ito 1993, Yu et al 2005, Philips et al 2015, repositories (Barta et al 2014(Barta et al , 2016 and tunnels (Ezersky et al 1993a, Luth et al 2014, Maghsoudi and Kalantari 2014. This monitoring is based on exact knowledge of the regularity of geophysical parameters at all stages of rock deformation process from elastic deforming to failure (Pacher 1970).…”

Section: Introductionmentioning

confidence: 99%

Geophysical Monitoring of Underground Constructions and its Theoretical Basis

Ezersky

Eppelbaum

2017

IJGE

View full text Add to dashboard Cite

Abstract:To avoid damage of rock mass, their collapse into underground space, danger for equipment and risks for human life, during construction and exploitation of large engineering projects (e.g. underground spaces, tunnels, machine halls, etc.) in-situ geotechnical and geophysical monitoring is carried out. Geophysical monitoring is based on observations of the elastic shear-and longitudinal wave velocities (Vs and Vp, respectively) and Acoustic Emission (AE). The behaviors of the elastic velocities and parameters of AE during rock deformation depend on the types of the future failure that, in turn, are defined by the structure and properties of the medium and characteristics of stress state 3/1 and hydrostatic pressure. These velocity variations are defined by difference in effective parameters of forming microfractures, whose geometry is distinguished at different modes of stress state. At that character of interaction between microfractures determines the types of the macrofailure. In this study, we discuss the behaviors of longitudinal wave velocities and acoustic emission during loading of large rock blocks and underground opening orienting measurements along maximum (1) and minimum (3) stresses. It is shown that velocity variations along the maximum stress is more informative at elastic phase of rock deformations (velocity increases), whereas velocity variations along axis of the minimum stress is more informative at the stage of nonlinear rock deformation (velocity begins to decrease during microfractures occurrence). These regularities are well observed at unloading rock mass in the Zhinvali tailrace tunnel where geophysical monitoring assisted in the construction. This knowledge could be used in planning and monitoring the stability of underground structures.

show abstract

Seismic Tomography and Monitoring in Underground Structures: Developments in the Freiberg Reiche Zeche Underground Lab (Freiberg, Germany) and Their Application in Underground Construction (SOUND)

Cited by 6 publications

References 15 publications

Integrated Interpretation of the Results of Long-Term Geotechnical Monitoring in Underground Tunnels Using the Electromagnetic Radiation Method

Integrated Interpretation of the Results of Long-Term Geotechnical Monitoring in Underground Tunnels Using the Electromagnetic Radiation Method

GFZ Underground Laboratory in the Research and Education Mine “Reiche Zeche” Freiberg

Geophysical Monitoring of Underground Constructions and its Theoretical Basis

Contact Info

Product

Resources

About