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We present a cosmic ray muon tomographic experiment for measuring the muonflux and imaging the tunnel overburden structures in Changshu, China. Thedevice used in this study is a tracking detector based on the plasticscintillator with SiPM technology, which can be conveniently operated in fieldworks. The compact system with sensitive area of $6400 cm^2$ can measure theangular distribution of cosmic muons. It's able to image the overburden densitylength from the surface of overburden to the detector along the muon tracks.The open sky muon flux measurement outside the tunnel has a good agreement withthe modified Gassier Formula model. The distributions of muon flux at threepositions inside the tunnel are very similar to that of open sky. Assuming theaverage density of overburden compact sandstone is $2.65 g/cm^3$, theoverburden thickness can be obtained from the density length derived from thedifference of muon flux inside and outside the tunnel. Moreover, for knownpenetrated lengths (i.e., topography of overburden), the density anomalies ofthe overburden can also been obtained. This study suggests a potentialapplication for imaging and detecting subsurface structures in civilengineering, tunnels or caverns with the cosmic ray muon telescope.

Cosmic muon flux measurement and tunnel overburden structure imaging