Study on the effect of overconsolidation ratio on dilatancy characteristics of Hefei hard clay

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Apr.2023, Vol.46 No.4: 529-534

DOI: 10.3969/j.issn.1003-5060.2023.04.015

Authors

CHEN Hexin $ ^{1} $, LU Guo $ ^{2} $, SHEN Yinbin $ ^{3} $, YANG Chengbin $ ^{1} $, WANG Jie $ ^{1} $

(1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 2. Zhejiang Company of Jinke Real Estate in East China, Hangzhou 311200, China; 3. Anhui Branch, China Jikan Research Institute of Engineering Investigation and Design Co., Ltd., Hefei 230051, China)

Abstract and Keywords

Abstract: In order to quantitatively explore the effect of overconsolidation ratio (OCR) on the dilatancy of Hefei hard clay, a triaxial dilatancy test was carried out on the undisturbed hard clay in Hefei area, and the results were compared with those of the remoulded soil. It shows that the maximum volume dilatancy rate of the undisturbed soil with an OCR of 2.7-4.68 is 1.1%-3.0%. Within a certain range, the OCR has a parabolic relationship with the maximum volume dilatancy rate. The maximum volume dilatancy rate of the remoulded soil is reduced by 33.3%-36.4% compared with that of the undisturbed soil, and some soil samples show the phenomenon of shear shrinkage before dilatancy. In addition, remoulded soils with OCRs of 1, 2, 4, and 8 were prepared for triaxial comparison tests. The test results show that the greater the OCR, the greater the reduction in the dilatancy of the remoulded soil, compared with that of the undisturbed soil. The maximum volume dilatancy rate of the remoulded soil is reduced by 5%-51%. Within a certain range, there is a strong linear relationship between the OCR and maximum volume dilatancy rate of the remoulded soil.

Keywords: Hefei hard clay; dilatancy; triaxial test; overconsolidation ratio (OCR); volume dilatancy rate

作者信息

陈贺欣 $ ^{1} $，陆国 $ ^{2} $，沈银斌 $ ^{3} $，杨成斌 $ ^{1} $，王杰 $ ^{1} $

（1. 合肥工业大学资源与环境工程学院，安徽合肥 230009；2. 金科地产华东大区浙江公司，浙江杭州 311200；3. 机械工业勘察设计研究院有限公司安徽分公司，安徽合肥 230051）

摘要和关键词

摘要: 为了定量探讨超固结比(overconsolidation ratio, OCR)对合肥硬黏土剪胀性的影响,文章对合肥地区原状硬黏土进行三轴剪胀试验,并与重塑土试验结果进行对照;制备超固结比分别为1、2、4、8的重塑土进行三轴对比试验。结果表明:OCR为2.70～4.68的原状土,其最大体积剪胀率为1.1%～3.0%,在一定范围内,OCR与最大体积剪胀率呈抛物线关系;重塑土与同深度原状土相比,最大体积剪胀率降低33.3%～36.4%,且部分土样出现先剪缩后剪胀的现象;与原状土相比,OCR越大,重塑土的剪胀性降低程度越大,重塑土样的最大体积剪胀率降低5%～51%,在一定范围内,重塑土OCR与最大体积剪胀率之间存在较强线性关系。

关键词: 合肥硬黏土；剪胀性；三轴试验；超固结比（OCR）；体积剪胀率

Funding

国家自然科学基金资助项目（41972278）

合肥工业大学学报(自然科学版)

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