ABSTRACT
This paper presents a case study using chemical churning pile (CCP) grouting and micropiles to mitigate surface settlement and building tilting due to nearby deep foundation excavation. The CCP grouting method is a process of injecting liquid cement material into soil or rock to change its physical properties. Micropiles are then installed beneath the tilted building in an attempt to lift the building up to its original position. For this case study, ten control points along the edge of the tilted building were installed, so that construction crews could closely monitor, better understand, and control the mitigation process. After completion of CCP grouting, a series of standard penetration tests (SPT) were performed to evaluate the effectiveness of CCP grouting in the improvement of soil strength. Based on soil test results and surveying records, it was concluded that the construction method of using CCP grouting and micropiles were successful in mitigating surface settlement and building inclination.
