目的探讨初始含水率对重塑黏性土压缩性状的影响,建立土结构性对天然沉积黏性土力学性状影响的定量评价基准.方法设计加工了适用于高初始含水率重塑黏性土固结试验的轻型固结仪,针对具有不同初始含水率的连云港黏性土重塑样进行了大量的一维固结试验.结果对连云港黏性土而言,当固结压力低于约25kPa时,采用孔隙指数不能将不同压缩曲线归一化;而超过25kPa后,各压缩曲线均可以较好的进行归一化至重塑土的固有压缩曲线上,且固有压缩参数e100、Cc与W0/wL之间存在良好的线性关系.结论得到了一簇对应不同初始含水率连云港重塑土样的压缩曲线,初始含水率高的重塑样压缩曲线位于含水率低的压缩曲线之上,表明初始含水率对重塑土压缩性状有着显著影响.
In order to investigate the initial water contents on compressive behavior of reconstituted clays and establish a reference framework for quantitatively assessing the effects of soil structure on mechanical behavior for naturally sedimentary soils, extensive oedometer tests were conducted on reconstituted Lianyungang clays with different initial water contents using the designed light oedometer. The test results suggest that initial water content does have a remarkable effect on compression behavior of reconstituted clays. The higher the initial water content is, the higher the position of the compression line is. When consolidation stress is less than 25 kPa, the compression line with different initial water contents can not be normalized with the void index proposed by Burland. When consolidation stress is larger than 25 kPa, different compression line can well be normalized to the intrinsic compression line with void index. The intrinsic compression index e100 and Cc* have a good liner relationship with W0/WL for reconstituted Lianyungang clays.