Soil grouting: Full scale injection test North/South metro line Amsterdam

This paper deals some aspects of the design of the North/South metro line Amsterdam. When using the shield tunnelling method for construction of the metro tunnels, complications with some historical buildings founded on pile foundations, due to settlements, will most probably occur. In order to increase the strength and stiffness properties of the soil by means of injection, mitigating measures are planned at these places. In general, the lack of experience with injection in the vicinity of pile foundations, in combination with the fact that the non homogeneous, stratified soil in Amsterdam has been injected only limited, has led to the development of the "Full Scale Injection Test". This paper will outline the injection techniques, geophysical survey and soil investigations planned for the test. Information has to be gained concerning amongst others: injection pressures, grout-take and dimensions and physical properties of the injection body.