Tunneling in weak rock mass with high water content may cause large ground movements and cracks, which may cause heavy damage to adjacent buildings and overlying facilities. During the construction of Beigang Tunnel, a railway tunnel buried in highly fractured and completely weathered rock mass rich in groundwater, serious collapse occurred. Taking the Beigang Tunnel as a prototype, model tests were conducted to study the pattern and law of ground subsidence and cracks when tunneling in weak rock mass. It was found that (1) water flow, which induced soil erosion, took the main responsibility for the tunnel's collapse, (2) before the appearance of the cracks, the distribution of surface settlements at the transverse section can be well described by Peck's Normal Probability Curve, (3) collapse happened first at the top of the tunnel and then developed upwards to form an arch shaped bearing structure; (4) the two largest cracks on the ground surface occurred at the early stage of collapse and were located on the either side of the tunnel axis, and settlements and cracks on ground surface developed mainly in the region between the two largest cracks.
Model Test Studies on Ground Subsidence and Cracks Induced by Tunneling in Weak Rock Mass with High Water Content
Ninth Asia Pacific Transportation Development Conference ; 2012 ; Chongqing, China
Sustainable Transportation Systems ; 455-463
2012-06-28
Conference paper
Electronic Resource
English
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