首页|In Situ Experiments on Supporting Load Effect of Large-span Deep Tunnels in Hard Rock
In Situ Experiments on Supporting Load Effect of Large-span Deep Tunnels in Hard Rock
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A section of the Nanliang high speed railway tunnel on Shijiazhuang-Taiyuan high-speed passenger railway line in China was instrumented and studied for its mechanical properties and performances.The cross section for the tunnel was 300 m2 and is classified as the largest cross section for railway tunnels in China.Through in situ experimental studies,mechanistic properties of the tunnel were identified,including the surrounding rock pressure,convergences along tunnel perimeter and safety of primary support and lining structure.Based on the field measured data,the surrounding rock pressure demand for large-span deep tunnel in hard rock is recommended as double peak type in the vertical direction and fold line type was recommended for horizontal pressure.The results suggested that Promojiyfakonov's theory was most close to the monitored value.Specific recommendations were also generated for the use of bolts in tunnel structures.Numerical simulation was used to evaluate the safety of the tunnel and it confirmed that the current design can satisfy the requirement of the current code.
Large-span tunnelRailway tunnelSurrounding rock pressureLoad distributionIn situ experiment
HE Ben-guo、ZHU Yong-quan、SUN Ming-lei、LIU Hong-yan、ZHANG Zhi-qiang
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School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401, America
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
国家自然科学基金国家自然科学基金New Century Excellent Talents in University
NETL
NSTL
万方数据
维普
