上海莲花路浅部土层超固结特性试验研究
发布时间:2018-03-25 09:23
本文选题:上海黏土 切入点:超固结度 出处:《上海交通大学学报》2016年03期
【摘要】:对上海2~6层原状土样进行了一系列室内试验,得到了整个浅层土基本物理参数,并由标准固结和三轴试验综合分析了上海浅部土层超固结度(OCR)的分布规律.研究认为上海浅层黏土天然含水率、初始孔隙比、液塑限、液性指数与塑性指数沿深度具有与OCR相反的变化规律.上海浅部土层的弱结构性导致一维压缩曲线无明显拐点,引用Becker能量法得到:2层土的OCR最大,达到8.0左右,之后急剧减小;3、4和5层土的OCR=1.15~1.40;6层土的OCR2.0.三轴排水试验结果体现了浅部各土层超固结性的差异,与标准固结试验的结果基本一致.这种固结试验与三轴试验相结合的研究方法为进一步准确得到原位土体尤其是弱结构性土的应力历史提供了新的途径.
[Abstract]:In this paper, a series of laboratory tests were carried out on the undisturbed soil samples of 2 layers in Shanghai, and the basic physical parameters of the whole shallow soil were obtained. Based on standard consolidation and triaxial tests, the distribution of OCRs in Shanghai shallow soil layer is comprehensively analyzed. It is considered that the natural water content, initial void ratio, liquid plastic limit of Shanghai shallow clay are natural. The variation of liquid index and plastic index along the depth is contrary to that of OCR. The weak structure of shallow soil layer in Shanghai leads to no obvious inflection point of one-dimensional compression curve. The maximum OCR of the two-layer soil is obtained by using the Becker energy method, which is about 8.0. The results of triaxial drainage test showed the difference of overconsolidation in shallow soil layers. The results are in good agreement with the results of standard consolidation test, which provides a new way to obtain the stress history of in-situ soil, especially the weakly structured soil, by combining the consolidation test with triaxial test.
【作者单位】: 上海交通大学土木工程系;济南轨道交通集团有限公司;
【基金】:国家自然科学基金(41372284) 上海市科学技术委员会科研项目(12231200703) 山东省自然科学基金(ZR2014EEM029) 山东省住房和城乡建设厅科技项目计划(KY053) 住房和城乡建设部科技项目计划(2015-K5-004)资助
【分类号】:TU411
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本文编号:1662505
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