METHODS FOR IN SITU CONSTRUCTION OF DEEP SOIL-CEMENT STRUCTURES

摘要

METHODS FOR IN SITU CONSTRUCTION OF DEEP SOIL-CEMENT STRUCTURES Methods are provided for the constructing of subterranean soilcement structures in situ. The methods utilize techniques designed to prolong the period of time in which an auger machine can operate in a bore hole without encountering difficulty due to the hardening of the soil-cement mixture. The techniques utilized include a preparatory drilling phase during which a lubricating slurry may be injected. This preparatory drilling serves to break up the soil and particularly if a lubricating slurry isused, reduce friction so that final drilling may progress more quickly. After preparatory drilling, final drilling takes place. Final drilling is divided into a downward and an upward phase. Either hardening or nonhardening slurry may be introduced and consolidated with the soil during the downward phase, but only hardening slurry is typically utilized during the upward phase of final drilling. These techniques result in a quicker and more homogenous mixture of slurry and soil and allow the bore hole to be deeper.