A 37 m deep ground treatment by jet grouting has been recently completed in relation to MRT Blue Line Extension Project in Bangkok. Scope of the work was the improvement of the mechanical and hydraulic characteristics of different soil strata to allow the safe (mined) excavation of two short tunnels connecting Intervention Shaft No. 2 (IVS.2) with the adjacent twin bored tunnels. After a brief description of the nature and characteristics of the different formations to be treated, the paper deals with the results of a preliminary 43.5 m deep trial field performed in the area aimed to define and optimize jet grouting procedures and parameters. The main equipment utilized and the specific logistic constraints characterizing the intervention are also described here with.
Subjects: underground, metro, jet grouting, soft clay, Bangkok
Author: Bruno Vingiani, Technical Manager and Maurizio Siepi
Publisher: DFI, EFFC