基于大型直剪试验的土石混合体颗粒破碎特征研究

刘新荣; 涂义亮; 王鹏; 钟祖良; 唐文斌; 杜立兵

doi:10.11779/CJGE201708009

基于大型直剪试验的土石混合体颗粒破碎特征研究 English Version

刘新荣^{1, 2},
涂义亮^{1, 2},
王鹏^{1, 2},
钟祖良^{1, 2},
唐文斌³,
杜立兵^{1, 2}

1. 重庆大学土木工程学院,重庆 400045;
2.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;
3. 中铁重庆地铁建设指挥部,重庆 401120

基金项目: 国家自然科学基金项目（41372356）; 高等学校博士学科点专项科研基金项目（20110191120033）; 中央高校基本科研业务费科研专项自然科学类项目（CDJZR12200012）

详细信息

作者简介:
刘新荣(1969- ),男,教授,博士生导师,主要从事土力学、地下工程等领域的教学与科研工作。E-mail：liuxrong@126.com。

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出版历程
- 收稿日期: 2016-05-22
- 发布日期: 2017-08-24

Particle breakage of soil-rock aggregate based on large-scale direct shear tests

LIU Xin-rong^{1, 2},
TU Yi-liang^{1, 2},
WANG Peng^{1, 2},
ZHONG Zu-liang^{1, 2},
TANG Wen-bin³,
DU Li-bing^{1, 2}

1. School of Civil Engineering, Chongqing University, Chongqing 400045, China;
2. Key Lab of Chinese Education Ministry for Construction and New Technology of Mountain Cities, Chongqing University, Chongqing 400045, China;
3. Chongqing Metro Consturction Headquarters of China Railway, Chongqing 401120, China

摘要

摘要: 土石混合体剪切时存在细观上的颗粒破碎现象,并对其宏观力学性质产生影响。基于此,以4种含水率的土石混合体为研究对象,通过室内大型直剪试验和筛分试验,分析土石混合体剪切后的颗粒破碎特征,并建立细观颗粒破碎与宏观力学性质的联系,从而加深对宏观力学性质的认识。研究结果表明：土石混合体剪切后的颗粒破碎较明显,可分为完全剪断型、表面破裂型和表面研磨型3类;颗粒破碎细观上表现为粗粒组含量降低、细粒组含量增加、中等粒组含量波动变化,统计上表现为级配曲线上移,宏观上表现为低含水率出现应变软化破坏、高含水率出现应变硬化破坏、中等含水率出现塑性应变破坏、剪应力-剪切位移曲线“跳跃”和强度非线性特征,本质上是颗粒间接触力作用产生应力集中的结果;颗粒相对破碎率随着含水率的降低或法向压力的增大而增大;黏聚力和内摩擦角均随着含水率的增大而呈幂函数规律降低。
- 土石混合体 /
- 直剪试验 /
- 筛分试验 /
- 含水率 /
- 颗粒破碎
Abstract: In the direct shear tests on soil-rock aggregate (SRA), particle breakage occurs in micro vision, which will influence its macro mechanical properties. On this basis, the laboratory large-scale direct shear tests and sieving analysis tests are conducted for SRA with four kinds of moisture contents. The particle breakage is analyzed based on the test results, and the connection between the micro particle breakage and the macro mechanical properties is established, which can eventually deepen engineers’ understanding of macro mechanical properties. The results show that: (1) The particle breakage appears to be obvious after shear tests, which can be divided into three types, i.e. complete-cut type, surface-ruptured type and surface-grinded type; (2) In micro vision, the particle breakage is characterized by decreasing coarse particles, increasing fine particles and fluctuation content of medium particles. In statistics, for the particle breakage, the grading curve is upward and in macro aspect, “jumping” occurs in the shear stress-shear displacement curves, the strength of SRA is of nonlinear characteristics, and the SRA with low, high and medium moisture contents exhibits strained softening, strained hardening and plastic-strain failure models. In fact, the particle breakage results from the stress concentration of particles by touching with each other; (3) Either the decrease of moisture content or the increase of normal pressure will cause the ratio of particles breakage to increase; (4) Both the cohesion and the internal friction angle decrease like power function with the increasing moisture content.
- soil-rock aggregate /
- direct shear test /
- sieving analysis test /
- moisture content /
- particle breakage

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