基于颗粒接触状态理论的粗细粒混合料液化强度试验研究

吴琪; 陈国兴; 周正龙; 凌道盛

doi:10.11779/CJGE201803011

基于颗粒接触状态理论的粗细粒混合料液化强度试验研究 English Version

吴琪¹,
陈国兴^1,2, ,,
周正龙³,
凌道盛⁴

1. 南京工业大学岩土工程研究所, 江苏南京 210009;
2. 江苏省土木工程防震技术研究中心,江苏南京 210009;
3. 苏交科集团股份有限公司,江苏南京 210009;
4. 浙江大学岩土工程研究所,浙江杭州 310058

基金项目: 国家自然科学基金项目（41172258; 51438004）; 国家重点基础研究发展计划（“973”计划）项目（2014CB047005）

详细信息

作者简介:
吴琪(1991-),男,博士研究生,主要从事混合料动力特性试验研究。E-mail：qw09061801@163.com。

通讯作者:
陈国兴，E-mail：gxc6307@163.com

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出版历程
- 收稿日期: 2016-12-08
- 发布日期: 2018-03-24

Experimental investigation on liquefaction resistance of fine-coarse-grained soil mixtures based on theory of intergrain contact state

1. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China;
2. Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing 210009, China;
3. Jiangsu Transportation Research Institute Co., Ltd., Nanjing 210009, China;
4. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China

摘要

摘要: 为探讨粗细粒混合料的液化强度CRR,对具有不同细粒含量FC和相对密度D_r的粗细粒混合料开展了一系列不排水循环三轴试验。基于颗粒接触状态理论,将粗细粒混合料分为类粗粒土、中间性态土和类细粒土;用骨架孔隙比e_sk表征混合料骨架颗粒的接触状态,引入参数b与m描述粗细粒混合料从类细粒土到类粗粒土过度中粗粒与细粒对颗粒接触状态的影响。试验结果表明：随着FC的增加,具有相同D_r粗细粒混合料的CRR先降低后基本保持不变。此外,具有不同FC和D_r的粗细粒混合料CRR都随e_sk的增大而降低。分析表明：基于颗粒接触状态理论的e_sk是合理地表征粗细粒混合料CRR的一个物理状态指标,且两者呈现较好的负幂函数关系。
- 粗细粒混合料 /
- 液化强度 /
- 颗粒接触状态 /
- 细粒含量 /
- 骨架孔隙比。
Abstract: In order to investigate the liquefaction resistance CRR of fine-coarse-grained soil mixtures, a series of undrained cyclic triaxial tests are performed on the fine-coarse-grained soil mixtures with different values of fines content FC and relative density D_r. According to the theory of intergrain contact state, the mixtures are categorized as coarse-like soil, intermediate behavior soil and fines-like soil. The skeleton void ratio e_sk is used as the grain contact density index to describe the intergrain contact state which composes the skeleton of mixtures, and the parameters b and m are used to characterize the contribution of the fines and the coarse grains to the transition between coarse-like and fines-like behaviors in mixtures. The test results show that as FC increases, the CRR of mixtures with the same D_r decreases first, and thereafter it remaines constant. In addition, the CRR of mixtures with different values of FC and D_r decreases with the increase of e_sk. Moreover, the test data obtained in this study reveal that e_sk can be used as the index to uniquely evaluate the CRR of mixtures, and a power relationship between a decrease in CRR and an increase in e_sk is then obtained.
- fine-coarse-grained soil mixture /
- liquefaction resistance /
- intergrain contact state /
- fines content /
- skeleton void ratio

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