用于土体宏微观力学特性测试的微型三轴仪研制

蒋明镜; 李光帅; 曹培; 吴晓峰

doi:10.11779/CJGE2020S1002

用于土体宏微观力学特性测试的微型三轴仪研制 English Version

蒋明镜^{1, 2, 3, 4,},
李光帅^{1, 2},
曹培³,
吴晓峰³

1.
天津大学建筑工程学院土木工程系,天津　300350
2.
天津大学水利工程仿真与安全国家重点实验室,天津　300350
3.
同济大学土木工程学院地下建筑与工程系,上海　200092
4.
中国地震局地震工程综合模拟与城乡抗震韧性重点实验室(天津大学),天津　300350

基金项目:

国家自然科学基金重大项目 51890911

国家自然科学基金重点项目 51639008

详细信息

作者简介:
蒋明镜（1965— ）,男,教授,博士生导师,主要从事天然结构性黏土、砂土、非饱和土、太空土和深海能源土宏观微观试验、本构模型和数值分析研究。E-mail：mingjing.jiang@tju.edu.cn

中图分类号: TU43
计量
- 文章访问数: 265
- HTML全文浏览量: 19
- PDF下载量: 114
出版历程
- 收稿日期: 2020-06-04
- 网络出版日期: 2022-12-07
- 刊出日期: 2020-10-31

Development of miniature triaxial apparatus for testing of macro- and micro-mechanical behaviors of soils

JIANG Ming-jing^{1, 2, 3, 4,},
LI Guang-shuai^{1, 2},
CAO Pei³,
WU Xiao-feng³

1.
Department of Civil Engineering, School of Civil Engineering, Tianjin University, Tianjin 300350, China
2.
State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China
3.
Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China
4.
Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration (Tianjin University), Tianjin 300350, China

摘要

摘要: 探求土体宏观力学性质背后的微细观机理,需要观测土体的微细观力学行为,为此基于常规三轴仪研制了适用于工业CT（computerized tomography）系统扫描的微型三轴仪,该设备包含加载装置和采集控制系统两部分,主要特点是体积小,重量轻,能够放入CT设备中进行旋转扫描,试样扫描清晰,能够获取土体三轴应力状态下土体的微观结构和力学信息,试验数据可靠,兼容性强,不影响现有CT的功能且无需改装CT,操作方便,经济合理。利用丰浦砂干砂样与常规三轴仪进行对比试验,微型三轴仪得到的应力应变关系与常规三轴试验基本一致,得到的内摩擦角误差较小,验证了该微型三轴仪的可靠性。
- 微型三轴仪 /
- CT扫描 /
- 无损检测 /
- 宏微观力学特性
Abstract: In order to explore the microscopic mechanisms associated with the macroscopic mechanical properties of soil, it is necessary to investigate the microscopic mechanical behaviors of soil. Based on the conventional triaxial apparatus, a miniature triaxial apparatus suitable for industrial CT system scanning is developed, which includes loading device and acquisition control system. The main features are as follows. The loading device can be put into CT equipment for rotary scanning because of small size and light weight. The specimen can be scanned clearly to obtain the microstructure and mechanical information of soil under triaxial stress. The reliable test data can be obtained. The miniature triaxial apparatus has strong compatibility, which does not affect the function of CT and does not also refit CT. It also has the advantage of convenient operation and low price. The contrast tests for the dry Toyoura sand samples are carried out by the miniature triaxial apparatus and conventional triaxial apparatus. The results show the stress-strain relationship and angle of internal friction obtained from miniature triaxial apparatus are in agreement with that obtained from the conventional triaxial apparatus. There is little difference on angles of internal friction obtained by two apparatus. Thus the reliability of the miniature triaxial apparatus is verified.
- miniature triaxial apparatus /
- CT scanning /
- non-destructive detection /
- macro- and micro-mechanical behavior

HTML全文

致谢：: 感谢张家港晟泰克智能仪器有限公司对仪器的加工制作。

图 1 微型三轴仪

Figure 1. Miniature triaxial apparatus

下载: 全尺寸图片幻灯片

图 2 丰浦砂样CT扫描切片

Figure 2. Micro-CT slice of Toyoura sand sample

下载: 全尺寸图片幻灯片

图 3 制干砂试样过程

Figure 3. Process of making dry sand sample

下载: 全尺寸图片幻灯片

图 4 微型三轴仪与常规三轴仪对比试验

Figure 4. Contrast tests between miniature triaxial apparatus and conventional triaxial apparatus

下载: 全尺寸图片幻灯片

图 5 偏应力与轴向应变关系曲线

Figure 5. Relationship between deviator stress and axial strain

下载: 全尺寸图片幻灯片

表 1 丰浦砂物理参数

Table 1 Physical parameters of Toyoura sand

土粒相对密度G_s 最大孔隙比e_max 最小孔隙比e_min

2.65 0.977 0.597

下载: 导出CSV

表 2 内摩擦角结果比较

Table 2 The comparison of the angle of internal friction

试验类型内摩擦角 $φ$ $φ$ /(°)

微型三轴试验 38.67
38.34
常规三轴试验 36.53
误差 5%

下载: 导出CSV

参考文献(14)

[1]	蒋明镜. 现代土力学研究的新视野——宏微观土力学[J]. 岩土工程学报, 2019, 41(2): 195-254. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201902002.htm JIANG Ming-jing. New paradigm for modern soil mechanics: Geomechanics from micro to macro[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(2): 195-254. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201902002.htm
[2]	AMOROSI A, RAMPELLO S. An experimental investigation into the mechanical behaviour of a structured stiff clay[J]. Géotechnique, 2007, 57(2): 153-166. doi: 10.1680/geot.2007.57.2.153
[3]	JIANG M J, SUN Y G, LI L Q, et al. Contact behavior of idealized granules bonded in two different interparticle distances: an experimental investigation[J]. Mechanics of Materials, 2012, 55(14): 1-15.
[4]	JIANG M J, YU H S, HARRIS D. A novel discrete model for granular material incorporating rolling resistance[J]. Computers and Geotechnics, 2005, 32(5): 340-357. doi: 10.1016/j.compgeo.2005.05.001
[5]	COOP M R, SORENSEN K K, FREITAS T B, et al. Particle breakage during shearing of a carbonate sand[J]. Geotechnique, 2004, 54(3): 157-163. doi: 10.1680/geot.2004.54.3.157
[6]	WIEBICKE M, ANDO E, VIGGIANI G, et al. Measuring the evolution of contact fabric in shear bands with X-ray tomography[J]. Acta Geotechnica, 2020, 15(1): 79-93. doi: 10.1007/s11440-019-00869-9
[7]	王登科, 张平, 魏建平, 等. CT可视化的受载煤体三维裂隙结构动态演化试验研究[J]. 煤炭学报, 2019(增刊2): 574-584. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB2019S2020.htm WANG Deng-ke, ZHANG Ping, WEI Jian-ping, et al. Research on dynamic evolution of 3D fracture structure of loaded coal body based on CT visualization[J]. Journal of China Coal Society, 2019(S2): 574-584. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB2019S2020.htm
[8]	葛修润, 任建喜, 蒲毅彬, 等. 煤岩三轴细观损伤演化规律的CT动态试验[J]. 岩石力学与工程学报, 1999, 18(5): 497-502. doi: 10.3321/j.issn:1000-6915.1999.05.001 GE Xiu-run, REN Jian-xi, PU Yi-bin, et al. A real-in-time CT triaxial testing study of meso-damage evolution law of coal[J]. Chinese Journal of Rock Mechanics and Engineering, 1999, 18(5): 497-502. (in Chinese) doi: 10.3321/j.issn:1000-6915.1999.05.001
[9]	陈正汉, 卢再华, 蒲毅彬. 非饱和土三轴仪的CT机配套及其应用[J]. 岩土工程学报, 2001, 23(4): 387-392. doi: 10.3321/j.issn:1000-4548.2001.04.001 CHEN Zheng-han, LU Zai-hua, PU Yi-bin. The matching of computerized tomography with triaxial test apparatus for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2001, 23(4): 387-392. (in Chinese) doi: 10.3321/j.issn:1000-4548.2001.04.001
[10]	李小春, 曾志姣, 石露, 等. 岩石微焦CT扫描的三轴仪及其初步应用[J]. 岩石力学与工程学报, 2015, 34(6): 1128-1134. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201506006.htm LI Xiao-chun, ZENG Zhi-jiao, SHI Lu, et al. Triaxial apparatus for micro-focus CT scan of rock and its preliminary application[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(6): 1128-1134. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201506006.htm
[11]	庞旭卿, 胡再强, 李宏儒, 等. 黄土剪切损伤演化及其力学特性的CT-三轴试验研究[J]. 水利学报, 2016, 47(2): 180-188. https://www.cnki.com.cn/Article/CJFDTOTAL-SLXB201602007.htm PANG Xu-qing, HU Zai-qiang, LI Hong-ru, et al. Structure damage evolution and mechanical properties of loess by CT-triaxial test[J]. Journal of Hydraulic Engineering, 2016, 47(2): 180-188. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SLXB201602007.htm
[12]	曹剑秋, 张巍, 肖瑞, 等. 南京粉砂三轴压缩过程中的三维孔隙结构演化特征[J]. 地球科学与环境学报, 2018, 40(4): 487-496. https://www.cnki.com.cn/Article/CJFDTOTAL-XAGX201804010.htm CAO Jian-qiu, ZHANG Wei, XIAO Rui, et al. Characteristics of 3D pore structure evolution 0f Nanjing silty sand during the triaxial compression[J]. Journal of Earth Sciences and Environment, 2018, 40(4): 487-496. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XAGX201804010.htm
[13]	程壮, 王剑锋. 用于颗粒土微观力学行为试验的微型三轴试验仪[J]. 岩土力学, 2018, 39(3): 1123-1129. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201803043.htm CHENG Zhuang, WANG Jian-feng. A mini-triaxial apparatus for testing of micro-scale mechanical behavior of granular soils[J]. Rock and Soil Mechanics. 2018, 39(3): 1123-1129. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201803043.htm
[14]	土工试验方法标准：GB/T 50123—2019[S]. 2019. Standard for Geotechnical Testing Method: GB/T 50123—2019[S]. 2019. (in Chinese)

施引文献

资源附件(0)

图(5) / 表(2)

计量

文章访问数: 265
HTML全文浏览量: 19
PDF下载量: 114
被引次数: 0

试验类型	内摩擦角 $φ$ $φ$ /(°)
微型三轴试验	38.67
微型三轴试验	38.34
常规三轴试验	36.53
误差	5%

用于土体宏微观力学特性测试的微型三轴仪研制 English Version

作者简介: 蒋明镜（1965— ）,男,教授,博士生导师,主要从事天然结构性黏土、砂土、非饱和土、太空土和深海能源土宏观微观试验、本构模型和数值分析研究。E-mail：mingjing.jiang@tju.edu.cn

计量

出版历程

Development of miniature triaxial apparatus for testing of macro- and micro-mechanical behaviors of soils

计量

出版历程

目录

作者简介:
蒋明镜（1965— ）,男,教授,博士生导师,主要从事天然结构性黏土、砂土、非饱和土、太空土和深海能源土宏观微观试验、本构模型和数值分析研究。E-mail：mingjing.jiang@tju.edu.cn