Experimental study on performance optimization of inert slurry and time-varying law of consolidation
Aiming at the problems of formation subsidence and segment floating control caused by the long setting time and low early strength of inert slurry in water-rich silty-fine sand strata,the preparation and consolidation test of cement-modified inert slurry was carried out.The results show that with the increase of cement content from 0 to 40 kg/m3,the setting time of the slurry is shortened from 24 h to 14 h,and the 3 d strength is increased from 35 kPa to 180 kPa,which significantly shortens the setting time of the slurry and improves the early strength.But at the same time,the fluidity of the slurry is reduced.In addition,when no cement is added,the polycarboxylate superplasticizer has no effect on the properties of the inert slurry,but after adding cement,the polycarboxylate superplasticizer can improve the fluidity of the slurry,delay the setting time,and improve the strength.When the cement content increases from 0 to 30 kg/m3,the permeability coefficient of the slurry decreases,which in turn reduces the consolidation drainage rate,prolongs the pore water pressure dissipation time,reduces the consolidation drainage volume,and reduces the consolidation axial strain.Under the same cement content,increasing the consolidation pressure increases the consolidation drainage,reduces the water-binder ratio of the slurry,and increases the unconfined compressive strength.
万方数据
维普
