Position estimates for existing trenchless installations

The position and alignment of existing cables and ducts, previously installed by trenchless technologies, has not always been recorded with sufficient accuracy for new works to be safely conducted close to existing installations. Inaccurate or missing registration in the past, manual data entry, previous activities in the same areas, can all...

Geo-engineering: A co-production of applied earth sciences and civil engineering - 2nd phase

Horizontal Cone Penetration Testing

It has been proposed to use horizontal cone penetration tests froma tunnel boringmachine to obtain additional information on the soil in front of the TBM. This article gives an overviewof various investigations into the feasibility of such a technique. The execution of the test as well as the interpretation of the measurements are considered....