... Underground tunneling with tunnel boring machine (TBM) in Singapore faces challenges related to the rheological behavior of the rock mass and possible changes in the hydrogeological conditions within the tunnel environment. Conventional geotechnical methods only measure surface changes or tunnel...

... educational setting university figure north america government alaska crrel tunnel permafrost tunnel permafrost tunnel engineering laboratory applied geoscience exploration geophysicist american association society united states government crrel permafrost tunnel gravel...

... Unlike the long-term geology changes in the environment, the subsoil condition in the urban area changes much more rapidly because of human activities like tunnel line building and other construction actions. The sudden changes may induce potential risks like sinkhole collapse and severe...

... The advance geological prediction of the shield machine is the guarantee of the safety and efficiency of tunnel construction, and the location of unfavorable geological bodies is a difficult problem in the advance geological prediction technology of tunnel seismic method. This paper proposes...

... giammanco upstream oil & gas muon telescope exploration geophysicist 10 configuration structural geology applied geoscience setup muography resistivity reservoir characterization exploration geophysics tunnel detector strips radiography scintillator A portable muon telescope...

... seismic-data experiment for tunnel detection demonstrates that it is superior to the conventional FWI workflow especially in shallow settings. Presentation Date: Wednesday, October 14, 2020 Session Start Time: 1:50 PM Presentation Time: 1:50 PM Location: 362C Presentation Type: Oral initial...

... dependent and is based on maximizing correlation coefficients to an averaged pilot trace. This alternative filtering technique in the common offset domain was compared to the conventional implementation, along with a variety of static shift parameters on data collected over a known tunnel. Slope filtering...

... ABSTRACT A multichannel surface wave approach proved very effective at detecting voids or tunnels using scattered and/or converted surface waves. In addition to conventional backscatter analysis of surface waves (BASW), we propose an imaging method developed to target a forward-propagating...

... ABSTRACT We developed an efficient method to image near-surface buried tunnels using back-scattered surface wave waveform inversion (BSWI). In this study, 2D seismic data were acquired over a manmade concrete tunnel located on the main campus of the University of Kansas (KU). A back-scattered...

... ABSTRACT We present the results of two surveys showing that shear wave seismic reflection can image a sewage tunnel buried at 17 m in marine clay, and coalmine tunnels close to the bedrock surface beneath about 30 m of recent fluvial sediments. The SH shear wave seismic reflection method...

... – R302 , 10.1190/geo2014-0461.1 . low-v anomaly shot record envelope seg international exposition tunnel detection reservoir characterization geometry true location annual meeting tunnel anomaly waveform upstream oil & gas land streamer data fwi dispersion inversion record...

... At the Captain Jack Superfund site located four miles southwest of Ward, Colorado, acid mine drainage is trickling in to Left Hand Creek, which flows in to Boulder, Co (Figure 1). The water needs to be treated and monitored. The proposed solution is to use the mine tunnels for in-situ water...

... , and J. R. McKenna , 2015 , Detecting clandestine tunnels using near-surface seismic techniques : Geophysics , 80 , no. 5 , EN127 – EN135 , 10.1190/geo2014-0529.1 . Tromp , J. , C. Tape , and Q. Liu , 2005 , Seismic tomography, adjoint methods, time...

...Tunnel detection by Full-waveform Inversion at Yuma Proving Ground, Arizona Yao Wang*, Richard D. Miller, Shelby L. Peterie, Kansas Geological Survey, University of Kansas; Steven D. Sloan, Mark L. Moran, and Harley H. Cudney, U.S. Army Engineer Research & Development Center Summary Tunnel...

... ABSTRACT Tunnel excavation engineering involves high risk due to the complexity and particularity of surroundings rock, and geophysical prospecting systems can play an important role for prediction of geological anomaly in this field. Tunnel Seismic Prediction (TSP) has been applied widely...

... ABSTRACT Focusing on tunnels, we review several surface-wave method (SWM) innovations used in the hunt for near-surface anomalies. We primarily examine a recent publication in that detailed several advancements of the classical backscatter analysis of surface waves (BASW) technique that has...

.... , 2013 , How significant is the cavity halo effect? Near Surface Geophysics Asia Pacific Conference , 476 – 479 . Llopis , J. L. , J. B. Dunbar , L. D. Wakeley , M. K. Corcoran , and D. K. Butler , 2005 , Tunnel detection along the southwest U.S. border...

... ABSTRACT A group of Han Dynasty tombs were found in Nanchang, Jiangxi Province, China, close to Poyang Lake. To investigate the coffin chambers, tunnels, burial pits, and remains of the tomb, a reconnaissance survey was carried out using integrated geophysical methods, including a ground...

...-component surface wave seismic data were acquired and analyzed as part of an ongoing feasibility study to observe a man-made tunnel at the Yuma Proving Ground in Arizona. Shear-wave velocity profiles were extracted using vertical and horizontal-inline component geophones. Those data were used to estimate...

... to the axis of the cylinder. The electromagnetic wavefield induced by this source is found analytically based on modal expansion of the wavefield both inside and outside of the tunnel. A new recursive scheme is introduced to overcome the numerical instabilities particularly at high frequencies corresponding...