Blanket Jet Grouting for Uplift Prevention in Deep Excavations for Bangkok MRT Purple Line Project
DOI:
https://doi.org/10.64862/Keywords:
Rapidjet method, Blanket jet grouting, Deep excavationAbstract
The jet grouting method is widely used in deep excavations to control uplift pressure, but challenges often arise in projects such as MRT tunnels with significant depths. At Intervention Shaft 05 (IVS05) of the Purple Line Project (Contract 3: Phan Fa–Memorial Bridge Section) in Bangkok, a 36.2 m deep excavation supported by a 44.3 m diaphragm wall was implemented. Groundwater was encountered at 15 m depth, with the base comprising a 2.5 m sand layer over a 7.5 m stiff clay layer. Jet grouting using 2.8 m diameter columns and the Rapidjet technique was applied to stabilize the base. The factor of safety was 1.6 when frictional resistance was included but dropped to 0.65 without it. Laboratory and field pumping tests validated the design parameters, confirming that Rapidjet grouting improved ground stability, reduced permeability, and achieved significant savings in both construction time and cost.
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