颗粒破碎对钙质砂压缩特性影响的试验研究

李彦彬; 李飒; 刘小龙; 陈文炜

doi:10.13544/j.cnki.jeg.2019-283

颗粒破碎对钙质砂压缩特性影响的试验研究

doi: 10.13544/j.cnki.jeg.2019-283

李彦彬^①,,
李飒^①, ,,
刘小龙^②,
陈文炜^②

①.
天津大学建工学院岩土所，天津 300072，中国
②.
中国船舶重工集团公司第702研究所，无锡 214082，中国

基金项目:

国家自然科学基金重大项目 51890911

工信部高技术船舶科研计划 2016[22]

详细信息

作者简介:
李彦彬(1994-)，女，硕士生，主要从事砂土压缩及颗粒破碎特性研究. E-mail: 462646671@qq.com

通讯作者:
李飒(1970-)，女，博士，教授，博士生导师，主要从事海洋土的工程性质的研究. E-mail: lisa@tju.edu.cn

中图分类号: TU411.A
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- 被引次数: 0
出版历程
- 收稿日期: 2019-07-01
- 修回日期: 2019-10-14
- 刊出日期: 2020-04-25

EFFECT OF PARTICLE BREAKAGE ON COMPRESSION PROPERTIES OF CALCAREOUS SANDS WITH OEDOMETER TESTS

LI Yanbin^{①
,},
LI Sa^{①
, ,},
LIU Xiaolong^②,
CHEN Wenwei^②

①.
Geotechnical Institute, Civil Engineering Department, Tianjin University, Tianjin 300072, China
②.
China Ship Research Center, China Shipbuilding Industry Corporation, Wuxi 214082, China

Funds:

the National Natural Science Foundation of China 51890911

the High Technology Ship Scientific Research Project of Ministry of Industry and Information Technology of China 2016[22]

摘要

摘要: 利用南海钙质砂和阿拉伯湾钙质砂，进行侧限压缩试验，对其压缩特性进行分析，得到了相应的压缩指数；采用相对破碎率为度量指标，评价了钙质砂在压缩试验过程中的颗粒破碎情况。同时根据试验数据得到了不同初始相对密实度的砂样的塑性功，通过建立塑性功与相对破碎率以及塑性功与压缩指数之间的关系，探讨了颗粒破碎对钙质砂压缩特性的影响。研究显示，在本次试验条件下，颗粒破碎是导致钙质砂压缩变形的主要因素，钙质砂的中值粒径以及碳酸钙含量等因素对其颗粒破碎程度有明显影响；钙质砂的相对破碎率与其输入的塑性功有关，并且受到初始相对密实度的影响，采用相对密实度进行归一化后，两者呈现较好的幂函数关系；通过建立钙质砂压缩指数与塑性功之间的关系，进一步建立了钙质砂的压缩指数与相对破碎率之间的关系，经相对密实度归一化后，两者也呈现幂函数规律，此规律可以用于评价颗粒破碎对钙质砂压缩特性的影响。
- 钙质砂 /
- 颗粒破碎 /
- 塑性功 /
- 侧限压缩
Abstract: This paper analyzes the compression characteristics of calcareous sands from the South China Sea and the Arabian Gulf through a series of oedometer tests. Based on the test results, we obtain the compression index and the plastic work of sand samples with different initial relative density values. At the same time, we evaluate the sand breakage with relative breakage index proposed by Hardin. The relationship between plastic work and relative breakage index as well as compression index is studied to discuss the influence of particle breakage on compression characteristics of calcareous sands. The results show that the mean diameter and the content of calcium carbonate have a significant effect on particle breakage, which is the main factor inducing the compression deformation of calcareous sands. The relative breakage index of calcareous sands mainly associates with the plastic work and the initial relative density. The relationship between relative breakage index and plastic work is a power function by normalizing of relative density. The power function is also satisfactory for the relationship between compression index and relative breakage index. It could be used to evaluate the effect of particle breakage on the compression characteristics of calcareous sands.
- Calcareous sands /
- Particle crushing /
- Plastic work /
- Oedometer test

HTML全文

图 1 钙质砂扫描电镜图(100倍)

a.南海钙质砂；b.阿拉伯湾钙质砂

Figure 1. SEM of calcareous sands(100x)

下载: 全尺寸图片幻灯片

图 2 各砂样颗粒级配曲线

Figure 2. Particle size distribution of samples

下载: 全尺寸图片幻灯片

图 3 砂样1，砂样2压缩-回弹-再压缩曲线

a.砂样1；b.砂样2

Figure 3. Compression-rebound-recompression curves of sand samples 1, 2

下载: 全尺寸图片幻灯片

图 4 砂样3，砂样4压缩-回弹-再压缩曲线

a.砂样3；b.砂样4

Figure 4. Compression-rebound-recompression curves of sand samples 3, 4

下载: 全尺寸图片幻灯片

图 5 砂样1，砂样2压前压后颗分曲线(D_r=0.3)

Figure 5. Fractional curves of sand samples 1, 2 before and after the tests(D_r=0.3)

下载: 全尺寸图片幻灯片

图 6 砂样3，砂样4压前压后颗分曲线(D_r=0.3)

Figure 6. Fractional curves of sand samples 3, 4 before and after the tests(D_r=0.3)

下载: 全尺寸图片幻灯片

图 7 相对密实度D_r与相对破碎率B_r的关系

Figure 7. Relationship between D_r and B_r

下载: 全尺寸图片幻灯片

图 8 中值粒径d₅₀与相对破碎率B_r的关系

Figure 8. Relationship between d₅₀ and B_r

下载: 全尺寸图片幻灯片

图 9 相对密实度D_r与压缩指数C_c的关系

Figure 9. Relationship between D_r and C_c

下载: 全尺寸图片幻灯片

图 10 砂样1，砂样2的E_s-p曲线

Figure 10. E_s-p curves of sand samples 1, 2

下载: 全尺寸图片幻灯片

图 11 砂样3，砂样4的E_s-p曲线

Figure 11. E_s-p curves of sand samples 3, 4

下载: 全尺寸图片幻灯片

图 12 塑性功W_p与相对密实度D_r的关系

Figure 12. Relationship between W_p and D_r

下载: 全尺寸图片幻灯片

图 13 塑性功W_p与相对破碎率B_r的关系

a.不同相对密实度下B_r-W_p关系；b. B_r-W_p归一化拟合结果

Figure 13. Relationship between W_p and B_r

下载: 全尺寸图片幻灯片

图 14 W_p与C_c之间的关系图

Figure 14. Relationship between W_p and C_c

下载: 全尺寸图片幻灯片

图 15 相对破碎率B_r与压缩指数C_c的关系

a.不同相对密实度下C_c-B_r关系；b. C_c-B_r归一化拟合结果

Figure 15. Relationship between B_r and C_c

下载: 全尺寸图片幻灯片

表 1 各砂样基本物理参数

Table 1. Basic physical parameters of sample

砂样	e_max	e_min	ρ_dmin /g·cm^-3	ρ_dmax /g·cm^-3	d₅₀ /mm	碳酸钙含量 /%
砂样1	1.32	0.83	1.205	1.523	0.40	91.85
砂样2	1.0	0.51	1.393	1.853	0.15	91.85
砂样3	1.26	0.78	1.234	1.569	0.13	91.85
砂样4	0.83	0.54	1.522	1.806	0.13	80.93

下载: 导出CSV

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