Abstract：Certain tunnel，the first special—long tunnel in North China，is 12. 78km long. It passes mainly through the purple—color soft sandrock and mudstone in Triassic or Dyas Sys?tems. The tunnel is obliquely crossed with gentle syncline. the tensile，tensile — twisting faults and structual joints are developed. Thus, its condition of hydrogeology is complicated.Themud surrounding rock has characteristic of expansibility. The gentle—slant rock may be landslip or drop, there may be some harmful gases, and the water and mud may ooze. At present，there is no well-considered and united method to appraise and forecast the expansi?bility of the mud surrounding rock and the complicated hydrogeology problems.
赵云恒,丰明海,程士俊,李长庆. 中国某特长隧道主要工程地质特征[J]. 铁道工程学报, 1996, 13(2): 120-128.
Zhao Yunheng Fen Minghai Cheng Shiun Li Changqing. STUDY ON MAIN PROBLEMS OF ENGINEERING GEOLOGY OF A SPEC AIL—LONG TUNNEL IN CHINA. Journal of Railway Engineering Society, 1996, 13(2): 120-128.
1996, Vol. 13 
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