Abstract The stratum passed by the Lanzhou-Chongqing railway is mainly loess, tertiary mudstone and sandstone, slate, carbonaceous slate and phyllite rock with regional faults, developed folds and high or extremely high geostress; therefore, the geological conditions are very complicated. In light of the technical problems during construction of the Lanzhou-Guangyuan section of the Lanzhou-Chongqing railway, this paper emphatically describes the construction problems encountered in tertiary weak consolidated pelitic fine water-rich siltstone, adopts countermeasures and analyzes characteristics of the soft rock squeezing deformation and stress state regarding tunnels in soft rock with high geostress. The grading standards and major control measures are presented for the large deformation of soft rock tunnels on the Lanzhou-Chongqing railway.
Abstract：
The stratum passed by the Lanzhou-Chongqing railway is mainly loess, tertiary mudstone and sandstone, slate, carbonaceous slate and phyllite rock with regional faults, developed folds and high or extremely high geostress; therefore, the geological conditions are very complicated. In light of the technical problems during construction of the Lanzhou-Guangyuan section of the Lanzhou-Chongqing railway, this paper emphatically describes the construction problems encountered in tertiary weak consolidated pelitic fine water-rich siltstone, adopts countermeasures and analyzes characteristics of the soft rock squeezing deformation and stress state regarding tunnels in soft rock with high geostress. The grading standards and major control measures are presented for the large deformation of soft rock tunnels on the Lanzhou-Chongqing railway.
LI Guo-Liang
.Construction Difficulties and Countermeasures for the Lanzhou-Chongqing Railway Tunnels in Complicated Geological Conditions[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(5): 10-15
2015, Vol. 52 