高含水率连云港重塑土压缩性状试验研究  

Research on Compression Behaviour of Lianyungang Reconstituted Clay at High Initial Water Contents

作　　者：骆凉平[1,2] 吴学春 丁建文[4] 

机构地区：[1]岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程研究所,南京210098 [3]南水北调东线江苏水源有限责任公司,南京210029 [4]东南大学交通学院岩土工程研究所,南京210096

出　　处：《科学技术与工程》2013年第25期7580-7584,共5页Science Technology and Engineering

基　　金：国家自然科学基金(51178107)资助

摘　　要：运用改进型的轻型固结仪对不同初始含水率的连云港重塑黏土进行初始荷载为0.5 kPa的一维固结压缩试验,以探讨不同初始含水率的连云港重塑土的压缩性状。试验发现重塑土的e-logσv’压缩曲线呈倒"S"形,这表明重塑土也存在类似于天然沉积土的固结屈服压力,Hong将其定义为重塑屈服压力并给出经验公式,试验结果验证了该公式的合理性。根据Burland提出的重塑土固有压缩理论对连云港重塑土压缩曲线进行归一化,试验结果表明,在固结压力大于重塑屈服压力时,不同初始含水率重塑土归一化效果较为理想,而在固结压力小于重塑屈服压力时,采用孔隙指数不能对重塑土e-logσv’曲线进行归一化。Oedometer tests starting from 0. 5 kPa were performed on Lianyungang reconstituted clay at different initial water contents to investigate the compressibility of reconstituted clay. It is observed that the e-lgo-v＇ compres- sion curves of reconstituted clay show a inverse ＂S＂ shape similar to that of soft natural clays, indicates that there should be a particular stress similar to consolidation yield stress for natural soils. Hong defined it as remoulded yield stress and suggested a empirical equation to estimate the stress, the test results verified the equation. Bur- land＇ s concept of intrinsic compression line is adopt for correlating the compression curves of Lianyungang clay at different initial water contents. It has been found that the compression curves can be well nomalised when the verti- cal stress is larger than remoulded yield stress while not the case for vertical stress lower than remoulded yield stress.

关 键 词：重塑土 压缩曲线 轻型固结仪 重塑屈服压力 

分 类 号：TU411.5[建筑科学—岩土工程]