Rapid urbanization has led to the utilization of underground spaces for effective and efficient flow of traffic. Tunneling has become an important component of transportation infrastructure. In some cases, tunnel has to go through unfavorable conditions like soil of very poor shear strength or high permeability, low overburden, etc. In these cases, tunneling operation becomes very sensitive to changing geological conditions; therefore, face pressure, grout pressure and other parameters need to be maintained precisely in order to prevent any adverse situation like soil collapse, blow out, ground water seepage through TBM cutter head and tail skin, etc. In the present ongoing project, TBM was launched in close proximity to sea shore line, hence water table is closer to ground surface. Soil profile consists of mainly very loose to dense silty sand. Depth of overburden is about 4.0 m at the launching zone. Utmost precautions have been taken and ground improvement technique has been adopted to enhance tunnel face stability, to reduce soil permeability and ground settlement during the tunneling operation. Groutability of soil has been calculated and based on that TAM grouting with the application of suitable admixtures has been adopted. In this paper, ground improvement scheme adopted to prevent any negative situation and to facilitate smooth tunneling operation, comparison of results obtained from 2 and 3D numerical modeling with Field instrumentation and monitoring data have been presented and discussed.