Identification of Karstic Features in Lateritic Soil by an Integrated Geophysical Approach

Anbazhagan, P.; Rohit, Divyesh; Prabhakaran, Athul; Vidyaranya, B.

doi:10.1007/s00024-018-1908-8

Cited by 11 publications

(1 citation statement)

References 15 publications

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“…Typical methods could be divided into three types: seismic method [11][12][13][14], electrical resistivity method [15][16][17][18], and electromagnetic method [19,20]. In addition, integrated geophysical exploration technology is also used in adverse geological detection to constrain geological models and improve the credibility of exploration results [21]. Because of its anti-electromagnetic interference properties and long detection distance, the seismic method is most widely utilized.…”

Section: Introductionmentioning

confidence: 99%

Double-shield TBM Mounted Seismic Ahead-prospecting System and its Application

Chen,

Li,

et al. 2024

Preprint

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Double-shield tunnel boring machine (TBM) has been widely used in tunnel construction. However, the unknown adverse geological conditions in front of the tunnel face can easily disturb the construction progress of the double-shield TBM. To ensure the construction safety of double-shield TBM, it is necessary to predict the geological information in front of the tunnel face in advance. However, the unique tunnel environment with a double-shield TBM makes it hard to predict geological conditions by conventional detection techniques. Therefore, this paper proposes a double-shield TBM-mounted seismic ahead-prospecting system. According to the special structure of double-shield TBM, a geological detection system mainly including the vibration source and rod-sensing elements was developed. The mounted vibration source is excited by high-pressure gas, and the excited seismic signal has strong energy, which can realize long-distance disaster prospection. The rod-sensing element can directly contact the surrounding rock mass through the grouting hole and collect reflected wave signals with a higher signal-to-noise ratio. The system can directly excite and receive seismic waves in the rock mass around the tunnel. The proposed system has been mounted on double-shield TBMs and verified based on field.

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Section: Introductionmentioning

confidence: 99%

Double-shield TBM Mounted Seismic Ahead-prospecting System and its Application

Chen,

Li,

et al. 2024

Preprint

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Not only the ‘Gold Train' – the ‘Underground Town' of Riese (Poland) – the ambiguity of interpretation ERT and GPR methods

Pasierb

Nawrocki²

2020

Archaeological Prospection

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This article presents the results of a geophysical survey conducted in the Sowie Mountains within the Walim commune (Poland) in order to verify the discovery of the 'Underground Town' of Riese. Project Riese was the biggest mining and construction project of Nazi Germany. The facility was designed as a convenient and secure location for a headquarters, an armaments factory, and warehouses for goods stolen during World War II. The discovery was made in 2015 with the application of the mysterious KS-700 apparatus, the same as was used to 'discover' the 'Gold Train', which is ground penetrating radar (GPR) according to the manufacturer. It was one of the reasons why the verification surveys of the underground sites and the KS-700 apparatus made use of the GPR method. The depth range of the GPR method was limited to 5 m due to the strong attenuation of electromagnetic waves. It was thus concluded that the underground structures detected by the 'discoverers' were probably a result of apparatus errors, in which near-surface reflections are received repeatedly and recorded as returning from a depth far greater than the actual object. Therefore, the electrical resistivity tomography (ERT) method proved to be conclusive. The three obtained characteristics and extremely high-resistivity anomalies indicated the existence of underground tunnels. A thorough analysis of the results and acquired data, as well as of the literature, has proven that it is impossible to interpret them unambiguously as data from the subsurface but as a result of the influence of the surrounding objects. At other sites where the KS-700 apparatus recorded numerous 'underground cavities', the ERT cross-sections did not yield a correlated image. Additionally, neither the analysis of the local geological structure with regard to the existence of an underground town nor the drilled boreholes confirmed the 'discoverer's' results. K E Y W O R D S 'Underground Town'-Riese, ambiguity of interpretation, archaeology, electrical resistivity tomography (ERT), geophysics, ground penetrating radar (GPR)

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