Tunnelling underneath the existing tunnels are very common these days. It is obvious that the under-crossing tunnelling will affect and even damage the existing tunnels. An analytical method is proposed in this paper to better understand the effects of the under-crossing tunnelling on the existing tunnel. The existing tunnel is modeled as a Timoshenko beam lying on a Kerr foundation. The validi…
LOKASI: Ruang Koleksi Umum Rak 3
Karst is a common geological condition in engineering construction. In order to study the influence of karst cave and boundary condition on the analysis of free field ground motion in karst area, viscoelastic artificial boundary was studied in free field ground motion analysis of karst region, a three-dimensional finite element model whose dimension is 1000 m × 1000 m × 500 m was set up, ch…
Trr No. 1311 Pavement Design, Management And Performance, pp. 79-84 Modern photoelectric sensors ussually consist of a light emitting diode (LED) source and a phototransistor receiver with associated lenses and electronic signal-processing circuits. The LEDs are operated in the infrared wavelengths for efficiency, and are pulse modulated to overcome the adverse effects of ambient light, slight…
Second International Conference On Road & Airfield Pavement Technology, Volume 1