Yazarlar: Atilla Horoz, Hasan Özaslan, İsmail Hakkı Baydur
Yayın Yeri : International Conference on Underground Space Use
Yayın Yılı : 2002
Açıklama : A 120 m long stretch of the Kızılay Tunnel belonging to the Ankara Light Rail Transit System (ANKARAY) is partly formed of alluvial units overlying the Ankara Clay. The alluvium is represented by varved layers of clay, silt, sand and gravel. Jet grouting was employed in this section of the tunnel passing through the alluvial deposits below the groundwater table. In this method, periphery of the tunnel was stabilized and groundwater leakage into the tunnel was minimized by forming vertical grout columns in the crown and sidewalls of the tunnel. It was observed that the soil parameters have been improved following the implementation according to the results of the lab testing. The grout columns taking place and spreading of the grout material particularly along the coarse grained levels of the alluvium have contributed to the tunnel stability and water tightness to a greater extent, and consequently the tunnel excavation has been completed without any significant problem. Prior to the implementation, it was estimated that the tunneling would not interfere so much with the groundwater flow in the alluvium, which was crossed by the Kızılay tunnel longitudinally. Following the construction, results of the periodic observation of the groundwater level confirmed that the groundwater table has been maintained almost at the same level