饱和橡胶砂动力特性动三轴试验研究

doi:10.16285/j.rsm.2018.1552

岩土力学 ›› 2019, Vol. 40 ›› Issue (10): 3797-3804.doi: 10.16285/j.rsm.2018.1552

饱和橡胶砂动力特性动三轴试验研究

周恩全，王琼，宗之鑫，陆建飞

江苏大学土木工程与力学学院，江苏镇江 212013

收稿日期:2018-08-27 出版日期:2019-10-11 发布日期:2019-10-19
作者简介:周恩全，男，1986年生，博士，讲师，硕士生导师，主要从事土动力学及岩土地震工程方面的研究。
基金资助:
国家自然科学基金(No. 51508236)；江苏省自然科学基金(No. BK20150519)；中国博士后基金(No. 2015M580397)；江苏大学高级人才科研启动基金(No. 15JDG172)。

Cyclic triaxial tests on dynamic characteristics of saturated rubber-sand mixture

ZHOU En-quan, WANG Qiong, ZONG Zhi-xin, LU Jian-fei

Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China

Received:2018-08-27 Online:2019-10-11 Published:2019-10-19
Supported by:
This work was supported by the National Natural Science Foundation of China (51508236), the Natural Science Foundation of Jiangsu Province (BK20150519), the China Postdoctoral Science Foundation (2015M580397) and the Research Foundation for Advanced Talents of Jiangsu University (15JDG172).

摘要/Abstract

摘要： 橡胶质轻、耐磨、渗透性好、减振性能优良，橡胶颗粒与砂土混合作为土工填料可被用于边坡、路基和垃圾填埋场中。通过室内动三轴试验研究了不同橡胶含量混合土的动强度特性及动孔压发展特性。结果表明：橡胶质量含量越高，混合土的抗液化强度越高，且混合土的液化强度曲线符合乘幂函数关系；考虑橡胶质量含量的影响，得到了归一化混合土液化强度曲线；初始应力比和橡胶含量对混合土动孔压比发展具有明显影响，建立了不同试验条件下动孔压比发展模型。试验发现，当初始动应力比超过0.4时，10%橡胶含量的混合土出现明显橡胶颗粒向上迁移现象。基于颗粒细观接触和颗粒运动状态，揭示了橡胶颗粒迁移机制。

关键词: 橡胶砂, 动三轴试验, 动强度, 动孔压, 颗粒迁移

Abstract: Due to the advantages in lightness, wear-resistance, permeability and high-damping, the rubber particles are mixed with sand to be applied as the lightweight fillers for slopes, subgrades and retaining walls. Thus, in this paper, the liquefaction potential and the dynamic pore water pressure of saturated rubber-sand mixtures with different rubber contents are investigated through the cyclic triaxial tests. The results show that the resistance to liquefaction significantly increases with the increase of rubber content in the rubber-sand mixtures. In addition, the liquefaction strength curve can be described by a power function. By taking the influence of rubber content, the normalized liquefaction strength curve of rubber-sand is obtained. The evolution models of dynamic pore pressure ratio under different test conditions are established, which are obviously influenced by the initial cyclic stress ratio and rubber content. It is observed that an evident upward migration of rubber particles occurs in the 10% rubber content mixtures when the intitial cyclic stress ratio exceeds 0.4. Based on the mesoscopic contact and movement state of particles, the migration mechanism of rubber particles is revealed.

Key words: rubber-sand mixture, cyclic triaxial test, liquefaction potential, dynamic pore pressure, particle migration

中图分类号:

TU 435

周恩全, 王琼, 宗之鑫, 陆建飞. 饱和橡胶砂动力特性动三轴试验研究[J]. 岩土力学, 2019, 40(10): 3797-3804.

ZHOU En-quan, WANG Qiong, ZONG Zhi-xin, LU Jian-fei. Cyclic triaxial tests on dynamic characteristics of saturated rubber-sand mixture[J]. Rock and Soil Mechanics, 2019, 40(10): 3797-3804.

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饱和橡胶砂动力特性动三轴试验研究

Cyclic triaxial tests on dynamic characteristics of saturated rubber-sand mixture

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