Prediction of Rock Mass Squeezing of T4 Tunnel in Iran

被引:19
作者
Ajalloeian R. [1 ]
Moghaddam B. [1 ]
Azimian A. [2 ]
机构
[1] Department of Geology, Faculty of Science, The University of Isfahan, Isfahan
[2] Department of Geology, Faculty of Science, Ferdowsi University of Mashhad (FUM), Mashhad
关键词
Contact zone of Iran and Arabic plates; Major Young Zagros fault; Squeezing phenomena; T4 tunnel of water conveyance;
D O I
10.1007/s10706-016-0139-y
中图分类号
学科分类号
摘要
One of the most important steps in designing underground structures is the evaluation of ground conditions in terms of squeezing potential and behavior of the geological structures. Generally, constructing a tunnel in the squeezing condition is a very slow and difficult task. Therefore, recognition and evaluation of the squeezing potential is very important in selecting a suitable excavation method and support, especially in weak rocks. This research is concerned with the assessment of squeezing potential along tunnel T4 of water conveyance system from Azad dam to Ravansar plain with the length of 11,380 m, located between Kurdistan and Kermanshah provinces, west of Iran. This tunnel is in an almost NS direction and flows through the contact zone of Iran and Arabic plates. According to the engineering geological investigations, the squeezing potential has been recognized as the most important difficulty in the excavation of tunnel T4. This conclusion can be explained by the several indicators including lithology, high disintegration of rock masses, alteration of rocks on the border of Iran and Arabic plates’ contact zone, low rock mass quality, high overburden, and highly jointed rock masses in a shuffle tectonic condition. This paper deals with the engineering geological and geomechanical properties of rock masses. Then, it evaluates squeezing intensity using empirical, semi-empirical, and analytical properties methods. The analysis conducted in these work shows that the tunnel excavation would encounter squeezing problems, which is most severe in region 2 due to the effects of the major young Zagros fault. © 2017, Springer International Publishing Switzerland.
引用
收藏
页码:747 / 763
页数:16
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