Abstract Using the Nanjing Weisan Road river-crossing tunnel, which is a large-diameter shield-driven tunnel in mixed ground with very high water pressure, as an example, the rational overburden thickness and anti-floating requirements for a tunnel structure during the construction and operation phases were studied in order to address such problems as unfavorable mixed ground, great depth and length of the entering rock layer and very high water pressure in the original design option. An optimized profile scheme is presented by combining the permanent weight scheme in the tunnel with the predicted and observed river-bed erosion data. Fewer construction difficulties and risks, a shorter construction period and easier driving can be achieved by adopting this optimization scheme while meeting the requirements for the tunnel plane and longitudinal profile index and assuring tunnel safety during construction and operation.
Abstract：
Using the Nanjing Weisan Road river-crossing tunnel, which is a large-diameter shield-driven tunnel in mixed ground with very high water pressure, as an example, the rational overburden thickness and anti-floating requirements for a tunnel structure during the construction and operation phases were studied in order to address such problems as unfavorable mixed ground, great depth and length of the entering rock layer and very high water pressure in the original design option. An optimized profile scheme is presented by combining the permanent weight scheme in the tunnel with the predicted and observed river-bed erosion data. Fewer construction difficulties and risks, a shorter construction period and easier driving can be achieved by adopting this optimization scheme while meeting the requirements for the tunnel plane and longitudinal profile index and assuring tunnel safety during construction and operation.
.Study of the Longitudial Profile Optimization of Large-Diameter Shield Tunnels in Mixed Ground with Very High Water Pressure[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(4): 7-14
2015, Vol. 52 