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以一种黏土为研究对象,对其压实样和预固结样进行一系列的持水特性试验和压汞试验,研究了不同制样方法对持水特性和内部孔隙结构分布的影响及在不同各向等应力作用下的持水特性。结果表明:预固结样的内部孔隙分布为单峰孔隙结构,孔隙大小分布较为均匀;压实样则为双峰孔隙结构,但压实样在20 k Pa的竖向压力作用下浸水饱和后,其内部孔隙分布变为单峰孔隙结构。此外,在相同各向等应力条件下初始孔隙比相近的预固结样和压实样的持水特性试验结果表明,预固结样的进气值要比压实样的大,其原因是前者孔隙分布较均匀;其次,受各向等应力越大的预固结样其进气值越大。最后,利用压汞试验的结果对预固结样和压实样的脱湿段的持水曲线进行了推算,并与实测值进行了对比。
Taking a kind of clay as the research object, a series of water-holding characteristics tests and mercury intrusion tests were carried out on the compacted and pre-consolidated samples. The effects of different sample preparation methods on the water-holding characteristics and the distribution of internal pore structures were studied. Water-holding characteristics under different isotropic stresses. The results show that the pre-consolidated inner pore distribution is a single-peaked pore structure with a uniform distribution of pore size and a bimodal pore structure in the compacted sample. However, under the saturated pressure of 20 kPa , Its internal pore distribution into a single peak pore structure. In addition, the test results of pre-consolidation and compaction-like water holding characteristics with similar initial void ratio under the same isotropic stress show that the pre-consolidation-like intake value is larger than the compacted sample due to The former pore distribution is more uniform; secondly, the larger the pre-consolidation rate is, the larger the inflow value is. Finally, the results of mercury injection test were used to calculate the water retention curve of pre-consolidated and compacted dehumidification sections and compared with the measured values.