珊瑚礁砂砾料力学行为与颗粒破碎的试验研究

王刚; 叶沁果; 查京京

doi:10.11779/CJGE201805004

珊瑚礁砂砾料力学行为与颗粒破碎的试验研究 English Version

王刚^{1, 2},
叶沁果^{1, 2},
查京京^{1, 2}

1. 山地城镇建设与新技术教育部重点实验室（重庆大学）,重庆 400045;
2. 重庆大学土木工程学院,重庆 400045

详细信息

作者简介:
王刚（1978- ）,男,博士,教授,主要从事土的本构理论、土动力学及地震工程、数值分析等方面的研究工作。E-mail: cewanggang@163.com。

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出版历程
- 修回日期: 2017-03-13
- 发布日期: 2018-05-24

Experimental study on mechanical behavior and particle crushing of coral sand-gravel fill

WANG Gang^{1, 2},
YE Qin-guo^{1, 2},
ZHA Jing-jing^{1, 2}

1. Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, China;
2. School of Civil Engineering, Chongqing University, Chongqing 400045, China

摘要

摘要: 珊瑚礁砂砾石是中国南海岛礁建设的主要填料,因为特殊的生物成因和多孔隙的颗粒结构,极易产生颗粒破碎。对取自南海某岛礁的珊瑚礁砂砾石填料开展了大型压缩试验、三轴排水剪切试验和三轴不排水剪切试验,研究了压缩指数、杨氏模量、剪胀和强度等基本工程力学指标与颗粒破碎的变化规律。在相同的压缩作用下,疏松试样比密实试样的颗粒破碎程度更大。颗粒破碎程度随着压力的增大而显著增大,导致珊瑚礁砂砾料的压缩模量和杨氏模量随压力的增大增幅不明显,峰值摩擦角和临界状态摩擦角随压力的增高而显著降低。颗粒破碎过程具有明显的应力路径和应力历史依赖性,有无预压作用的相同密度的试样表现出显著不同的压缩特性,相同密度和初始压力的试样在排水和不排水剪切下也表现出明显不同的剪胀和强度特性。峰值摩擦角依赖于应力路径和颗粒破碎的演化过程;临界状态摩擦角与最终的颗粒破碎指标值有较好的相关性,与颗粒破碎的产生过程无关。
- 钙质砂砾料 /
- 颗粒破碎 /
- 模量 /
- 摩擦角 /
- 相对破碎指数
Abstract: The coral sand and gravel are used as the main source of reclamation fill in the island construction of the South China Sea. Due to their biological origin, the grains of coral sand-gravel fill are porous and prone to breakage. A series of large-scale compression tests, triaxial drained and undrained shear tests are conducted on a typical coral sand-gravel fill from the South China Sea, and the basic mechanical properties such as compression index, Yang’s modulus, shear-dilatancy and strength parameters as well as particle crushing characteristics of the coral sand-gravel fill are studied. Under the compression, the particle crushing of a loose sample is more serious than that of a dense sample. Particle crushing increases with the increasing pressure, in result, the compressive modulus and Young's modulus increase little, and the peak friction angle and the critical state friction angle decrease significantly as the pressure increases. The particle crushing has a strong dependency on stress path and history. The samples with the same density but different pre-compression histories exhibit significantly different responses under compression. The samples with the same density and initial pressure also show different dilatant tendency and strength characteristics under drained and undrained triaxial shearing. The peak friction angle depends on the stress path and the evolution process of particle crushing, and the critical state friction angle can be well correlated to a particle breakage index in the final state, implying that it is independent of the intermediate evolution process of particle crushing.
- coral sand-gravel fill /
- particle breakage /
- modulus /
- friction angle /
- relative breakage index

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参考文献(23)

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珊瑚礁砂砾料力学行为与颗粒破碎的试验研究 English Version

作者简介: 王 刚（1978- ）,男,博士,教授,主要从事土的本构理论、土动力学及地震工程、数值分析等方面的研究工作。E-mail: cewanggang@163.com。

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出版历程

Experimental study on mechanical behavior and particle crushing of coral sand-gravel fill

期刊类型引用(6)

其他类型引用(7)

计量

出版历程

目录

作者简介:
王刚（1978- ）,男,博士,教授,主要从事土的本构理论、土动力学及地震工程、数值分析等方面的研究工作。E-mail: cewanggang@163.com。