The detection of abandoned mineshafts by railway track bed using transmitted seismic waves using broadside shot gathers
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چکیده
منابع مشابه
Constrained Traveltime Inversion Using Reflected Waves of Surface Shot Gathers
We formulated an approach to estimate parameters of a layered earth model such as interval velocity, reflector depth, and dip by inverting reflected traveltime with constraints on dipping directions and depth to reflectors. We applied the “shooting method” (Lines, Bourgeois and Covey, 1984) to calculate modeled reflection time. We derived an explicit expression of the Jacobian matrix. The effic...
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When rails are laid in a railway track, small gaps are left between the ends of adjoining rails to allow for the expansion of the rails when the temperature rises. Rail joints are provided to form a continuous rail path which are normally laid in standard lengths bolted together by fishplates. When two rail joints are exactly opposing each other, they are called square (side by side) joints...
متن کاملSquare Joints in Railway Track Waves
When rails are laid in a railway track, small gaps are left between the ends of adjoining rails to allow for the expansion of the rails when the temperature rises. Rail joints are provided to form a continuous rail path which are normally laid in standard lengths bolted together by fishplates. When two rail joints are exactly opposing each other, they are called square 

(side by side) jo...
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ژورنال
عنوان ژورنال: Construction and Building Materials
سال: 2018
ISSN: 0950-0618
DOI: 10.1016/j.conbuildmat.2018.04.105