FIELD TESTS ON IMPROVEMENT OF SEA-LAND INTERACTION LIQUEFIABLE GROUND THROUGH INTELLIGENT VIBRATORY PROBE COMPACTION METHOD

The Yangtze River delta region displays distinctive engineering geological features characterized by sea-land interaction liquefiable ground, comprised of chalk, silt, and soft clay layers. As China's highway infrastructure advances rapidly, there is a pressing need to address the challenges posed by this type of ground. The Yangtong Highway project successfully utilized the innovative vibratory probe compaction method to enhance the sea-land intersection liquefiable ground. A comprehensive assessment of this method's effectiveness was conducted through a series of tests including indoor experiments, in-situ assessments, and settlement monitoring throughout the filling process, with a comparative analysis against traditional stone columns method. Results from the study revealed a significant enhancement in the density, internal friction angle, and compression modulus of the test area, accompanied by notable reductions in water content and void ratio. Furthermore, key soil properties such as cone resistance, sleeve friction, and SPT blow counts exhibited an increase exceeding 80% post-treatment, while surface wave velocity saw a 15% boost. The projected settlement after completion stood at 10.36 mm, meeting the required standards for highway construction. Notably, the vibratory probe compaction method proved to be 38.0% more cost-effective than the stone columns approach, boasting a streamlined and visualized construction process that is both automated and efficient, showcasing promising economic viability and future application prospects.