In Situ Experiments on Supporting Load Effect of Large-span Deep Tunnels in Hard Rock  

作　　者：HE Ben-guo ZHU Yong-quan SUN Ming-lei LIU Hong-yan ZHANG Zhi-qiang 

机构地区：[1]School of Civil Engineering, Shijiazhuang Tiedao University [2]Department of Civil and Environmental Engineering, Colorado School of Mines [3]School of Civil Engineering, Southwest Jiaotong University

出　　处：《Journal of Mountain Science》2013年第6期1125-1136,共12页山地科学学报（英文）

基　　金：sponsored by projects (Grant Nos. 50978172, 51078318) of the National Natural Science Foundation of China;Project (Grant No. 10-0667) supposed by the New Century Excellent Talents in University

摘　　要：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 was300 m2and 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.

关 键 词：Large-span tunnel Railway tunnel Surrounding rock pressure Load distribution In situ experiment 

分 类 号：U451.5[建筑科学—桥梁与隧道工程]