基于超大型三轴仪的堆石料缩尺效应研究

孔宪京; 宁凡伟; 刘京茂; 邹德高; 周晨光

doi:10.11779/CJGE201902002

基于超大型三轴仪的堆石料缩尺效应研究 English Version

孔宪京^{1, 2},
宁凡伟^{1, 2},
刘京茂^{1, 2, ,},
邹德高^{1, 2},
周晨光^{1, 2}

1. 大连理工大学海岸与近海工程国家重点实验室,辽宁大连 116024;
2. 大连理工大学工程抗震研究所建设工程学部水利工程学院,辽宁大连 116024

基金项目: 国家重点研发计划项目（2017YFC0404902）; 国家自然科学基金项目（51678113,51779034,51608095）; 中央高校基本科研业务费项目（DUT17ZD219）

详细信息

作者简介:
孔宪京(1952- ),男,博士,中国工程院院士,主要从事岩土地震工程、高坝和核电工程抗震研究工作。E-mail: kongxj@dlut.edu.cn。

通讯作者:
刘京茂，E-mail：liujm@dlut.edu.cn

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- 收稿日期: 2018-01-16
- 发布日期: 2019-02-24

Scale effect of rockfill materials using super-large triaxial tests

KONG Xian-jing^{1, 2},
NING Fan-wei^{1, 2},
LIU Jing-mao^{1, 2, ,},
ZOU De-gao^{1, 2},
ZHOU Chen-guang^{1, 2}

1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;
2. Institute of Earthquake Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China

摘要

摘要: 对某一爆破筑坝堆石料开展了试样直径1 m（最大粒径为200 mm）的超大型和试样直径0.3 m（最大粒径为60 mm）的常规大型三轴固结排水剪切试验,研究了平行相似级配条件下最大粒径对应力-应变关系、颗粒破碎、特征应力状态、割线模量及邓肯张E-B模型参数的影响。试验结果表明：①大型三轴试验的峰值内摩擦角大于超大型三轴试验,并且峰值应力处的轴向应变小于超大型三轴试验;②大型三轴试验的相变应力比大于超大型三轴试验,并且相变处的体变及轴向应变均小于超大型三轴试验;③大型三轴试验的颗粒破碎率小于超大型三轴试验,但二者平行粒组的变化规律相同;④大型三轴试验在应力水平50%处的割线弹性模量及割线体积模量均大于超大型三轴试验。大型三轴试验的邓肯张E-B模型参数k,k_b分别是超大型三轴试验的1.22倍、1.38倍。研究成果可为建立考虑缩尺效应的堆石料本构模型和分析土工构筑物变形提供重要的试验依据。
- 堆石料 /
- 超大三轴 /
- 缩尺效应 /
- 最大粒径 /
- 颗粒破碎
Abstract: A super-large triaxial apparatus and a common large triaxial apparatus are used to conduct triaxial tests on quarried rockfill materials with the maximum particle size d_max of 200 and 60 mm in parallel gradation. The study mainly focuses on the effect of particle size on the stress-strain relation, particle breakage, characteristic stress state and parameters of Duncan-Chang model. The results show that the peak friction angle of d_max=60 mm is higher than that of the d_max=200 mm, and the axial stain at the peak strength of d_max=60mm is smaller than that at d_max=200 mm. The phase transformation stress ratio of d_max=60 mm is higher than that at d_max=200 mm, and the volumetric and axial strains in phase transformation state are smaller than those at d_max=200 mm. The amount of particle breakage of d_max=200 mm is greater than that at d_max=60 mm. The secant elastic and bulk moduli at 50% stress level of d_max=60 mm are larger than those at d_max=200 mm. The parameters k and k_bof Duncan-Chang model for d_max=60 mm are 1.22 and 1.38 times those for d_max=200 mm, respectively. This study may provide valuable experimental references for the constitutive model considering scale effect and the deformation analysis for rockfill structures.
- rockfill material /
- super-large triaixal test /
- scale effect /
- maximum particle size discrete /
- particle breakage

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参考文献(19)

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基于超大型三轴仪的堆石料缩尺效应研究 English Version

作者简介: 孔宪京(1952- ),男,博士,中国工程院院士,主要从事岩土地震工程、高坝和核电工程抗震研究工作。E-mail: kongxj@dlut.edu.cn。

通讯作者: 刘京茂，E-mail：liujm@dlut.edu.cn

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出版历程

Scale effect of rockfill materials using super-large triaxial tests

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出版历程

目录

作者简介:
孔宪京(1952- ),男,博士,中国工程院院士,主要从事岩土地震工程、高坝和核电工程抗震研究工作。E-mail: kongxj@dlut.edu.cn。

通讯作者:
刘京茂，E-mail：liujm@dlut.edu.cn