Full-scale filed tests of jet-vibratory probe compaction method for collapsible soil-rock mixtures

Abstract

Soil-rock mixtures (SRM) are abundant worldwide and often used as foundations. However, their heterogeneity, inherent weakness, and collapsibility present significant challenges in stabilization. This study introduces a novel approach to foundation treatment, combining ''shallow drainage'' and ''deep sealing'' techniques. Comprehensive on-site vibratory reinforcement trials were conducted using a gas-vibration coupling method called jet-vibratory probe compaction (JVPC). The method successfully created an oriented particle distribution and a dual-layer system within the depth. The effectiveness of this reinforcement and its mechanisms were thoroughly assessed through various in-situ tests, including triaxial vibration testing (TVT), multi-channel analysis of surface waves (MASW), dynamic penetration test (DPT), sand cone method (SCM), and plate doad test (PLT). The findings reveal that JVPC eliminated the collapsibility of the SRM and significantly enhanced the bearing capacity of foundations. A notable outcome was the formation of a distinct stratification within the foundation, characterized by a coarser upper section, a finer lower section, and a watertight boundary at the base. This innovative approach demonstrates a promising advancement in foundation engineering, particularly for challenging SRM-based constructions.

Keywords

• Soil-rock mixtures
• Collapsible
• Gas-vibration
• Compaction
• Dual-layer