Underground tunnels detection and location by high resolution seismic reflection

Piwakowski, Bogdan; Tricot, J. C.; Delannoy, B.

doi:10.3997/2214-4609.201409844

Cited by 2 publications

(1 citation statement)

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“…Several research groups have studied practical applications of seismic methods for cavity and buried objects detection. Piwakowski et al (,) and Gochioco () applied the reflection seismic method for detecting old gypsum and coal mines. Herman et al () showed that Rayleigh waves are suitable for shallow object imaging.…”

Section: Introductionmentioning

confidence: 99%

Investigation of underground cavities in a two‐layer model using the refraction seismic method

Engelsfeld

Šumanovac

Pavin

2008

Near Surface Geophysics

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This paper presents a new approach to the investigation of underground cavities. Our technique is based on the refraction seismic method. We have studied a two‐dimensional, two‐layer geological model. In our model, the lower seismic velocity layer is situated above the higher seismic velocity layer, with a circular cavity positioned within the upper layer. We have investigated the influence exerted by the cavity on the first arrivals of seismic waves. The obtained traveltimes are solutions of the eikonal equation and are presented using the time‐distance graph. All refracted waves encountering the cavity have to circumvent it, as it represents an impediment to the propagation of seismic energy. This circumvention causes delays in the first arrivals of the seismic waves at the surface as compared to traveltimes with no cavity present. These delays create a characteristic shape of the time‐distance graph, characterized by the peak point in which the plot line has a discontinuous change. Using this graph and analysing the delays of the first arrivals, we have derived expressions for determining both the position and size of the circular cavity. The practical application of the derived relations has been tested on a model test site built in a natural rock setting. This simple method indicates the presence of the cavity. The accuracy of the calculated cavity parameters: the horizontal position x, the depth z and cavity radius r depends on the geophone spacing. For geophone spacing equal to or less than the cavity radius, the accuracy of the method is shown to be acceptable. The maximal estimated error is equal to a half geophone spacing. Finally, we have demonstrated that this method is also applicable in the detection of non‐circular cavities.

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Section: Introductionmentioning

confidence: 99%

Investigation of underground cavities in a two‐layer model using the refraction seismic method

Engelsfeld

Šumanovac

Pavin

2008

Near Surface Geophysics

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High resolution seismic investigation in salt mining context

2009

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The high resolution seismic (HRS) reflection survey was conducted on an experimental site in eastern France. Three profiles were designed in order to check the detectability of salt-mining cavities at depth range of 110-180 m. The detection and location of cavities on the HRS images are based on indirect symptoms corresponding to cavity-induced perturbations of lower markers. In most cases, the cavities were detected and the accuracy of estimation of horizontal extensions of the cavities was surprisingly good (of about 10 m). The accuracy of vertical positioning is difficult to establish when the detection is performed indirectly and the only information that could be derived is that a cavity is beyond the masked geological interface. The detection ability depends on the size of the cavity in regard to wavelength and depth. These factors are included in AN coefficient which was used in order to evaluate the detectability of a given cavity

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Underground tunnels detection and location by high resolution seismic reflection

Cited by 2 publications

References 0 publications

Investigation of underground cavities in a two‐layer model using the refraction seismic method

Investigation of underground cavities in a two‐layer model using the refraction seismic method

High resolution seismic investigation in salt mining context

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