水泥与生石灰处理吹填土对比试验研究

吹填土是由水力吹填形成的,颗粒很细,固结性能差,吹填以后要经过很长时间才能自然沉积固结,待表面形成硬壳后方可进行加固处理,因此,缩短沉积固结时间,使吹填土尽快地从泥浆状态转变为具有一定承载力的地基,是亟待解决的问题。在室内进行模拟加固方法的沉降柱试验,对吹填土加添固化剂以加速其沉积固结。固化剂主要选用水泥和生石灰,对两种添加方式的机理及固结效果进行详尽的分析和研究,初步找出加固效果产生差异的原因,从而揭示其固化机理,为吹填土地基的加固提供一种更加经济可行的方法。

LABORATORY MODEL TESTS ON CONSOLIDATION OF HYDRAULIC FILLS TREATED WITH LIME OR CEMENT ADDITIVES

The dredger fill is formed under the hydraulic filling,which consists of fine particles and has a poor consolidation capability.Its natural sedimentation and consolidation after dredger filling is a very slow process,and only when the surface duricrust has formed,the ground improvement can be started.So it is urgently necessary to accelerate the consolidation process,and transform the dredged mud into a solid ground which has a certain bearing capacity.Laboratory model tests were carried out to simulate the effect of consolidation agent.Lime and cement were chosen as the consolidation agents to be added into the dredger fill to accelerate the consolidation process respectively.The solidifying mechanism and consolidation performance of the two materials have been studied carefully.The reason for their different consolidation behavior is tentatively concluded,and the consolidation mechanism is correspondingly put forward.A more economical and feasible method for consolidating foundation of dredger fill has been provided in this paper.