Email Alerts
RSS
Analysis of strength-deformation behavior of coral sand with different densities and stress levels
-
摘要: 为研究密度与应力水平对珊瑚砂强度和变形特性的影响，利用三轴仪，对珊瑚砂试样开展了一系列不同密度、不同应力水平条件下的三轴固结排水剪试验。根据试验结果分析了珊瑚砂密度和应力水平对其应力应变、体积变形特性及强度特性等的影响。结果表明，不同相对密度的试样均表现出剪胀特性，同一初始密度的试样，围压越大其剪胀现象越不显著。珊瑚砂初始切线模量随着围压和相对密度的增大而增大，可近似用直线表示，并建立了初始切线模量与相对密度和围压的关系式。相变点应变随围压的增大而增大，随相对密度的增大而减小。珊瑚砂强度指标φ0和Δφ随着相对密度的增大而呈线性增大趋势。Abstract: In order to study the influences of density and stress level on the strength and deformation characteristics of the coral sand, a series of triaxial consolidation drained shear tests with different densities and stress levels are carried out using a triaxial apparatus. Based on the experimental study results, the effects of the density and stress level of the coral sand on its stress-strain, volume deformation characteristics and strength characteristics are analyzed. The analysis results show that the specimens with different relative densities all have the dilatancy characteristics, while for the specimens with same initial density, the larger the confining pressure, the less obvious the dilatancy. The initial tangential modulus of the coral sand increases with the increase of the confining pressure and relative density, which can be approximately expressed by a straight line. The relationships between the initial tangent modulus, relative density and confining pressure are established in this paper. The strain at the phase transition point increases with the increase of the confining pressure and decreases with the increase of the relative density. The strength indexes of the coral sand increase linearly with the increase of the relative density, and the relationships between them are established.
-
Key words:
- coral sand /
- density /
- stress and deformation /
- triaxial test /
- confining pressure
-
图 2 偏应力与轴向应变关系曲线
Figure 2. Relationship curves of deviatoric stress versus axial strain
图 3 破坏应变与围压关系曲线
Figure 3. Relationship curves of failure strain versus confining pressure
图 4 体积应变与轴向应变关系曲线
Figure 4. Relationship curves of volumetric strain versus axial strain
图 5 相变点应变与相对密度关系曲线
Figure 5. Curves of phase transition strain versus confining pressure
图 8 初始切线模量与相对密度关系曲线
Figure 8. Relationship curves of initial tangent modulus and relative densities
-
[1] LI X S, DAFALIAS Y F. Dilatancy for cohesionless soils[J]. Géotechnique, 2000, 50(4): 449-460. doi: 10.1680/geot.2000.50.4.449 [2] 蔡正银, 李相菘. 砂土的剪胀理论及其本构模型的发展[J]. 岩土工程学报,2007,29(8):1122-1128. (CAI Zhengyin, LI Xiangsong. Development of dilatancy theory and constitutive model of sand[J]. Chinese Journal of Geotechnical Engineering, 2007, 29(8): 1122-1128. (in Chinese) doi: 10.3321/j.issn:1000-4548.2007.08.002 [3] 王新志, 汪稔, 孟庆山, 等. 钙质砂室内载荷试验研究[J]. 岩土力学,2009,30(1):147-151, 156. (WANG Xinzhi, WANG Ren, MENG Qingshan, et al. Study of plate load test of calcareous sand[J]. Rock and Soil Mechanics, 2009, 30(1): 147-151, 156. (in Chinese) doi: 10.3969/j.issn.1000-7598.2009.01.025 [4] 王丽, 鲁晓兵, 王淑云, 等. 钙质砂的胶结性及对力学性质影响的实验研究[J]. 实验力学,2009,24(2):133-143. (WANG Li, LU Xiaobing, WANG Shuyun, et al. Experimental investigation on cementation of calcareous sand and its basic mechanical characteristics[J]. Journal of Experimental Mechanics, 2009, 24(2): 133-143. (in Chinese) [5] JIANG L, FAN J H, WANG Z J, et al. Mechanical property of calcareous sand under action of compaction[J]. Global Geology, 2015, 18(3): 183-187. [6] 杨佳, 范建华, 汪正金. 钙质砂的抗剪强度与干密度的拟合研究[J]. 中国水运,2015,15(8):341-342. (YANG Jia, FAN Jianhua, WANG Zhengjin. Fitting research on shear strength and dry density of calcareous sand[J]. China Water Transport, 2015, 15(8): 341-342. (in Chinese) [7] VAN IMPE P O, VAN IMPE W F, MANZOTTI A, et al. Compaction control and related stress-strain behaviour of off-shore land reclamations with calcareous sands[J]. Soils and Foundations, 2015, 55(6): 1474-1486. doi: 10.1016/j.sandf.2015.10.012 [8] 黄宏翔, 陈育民, 王建平, 等. 钙质砂抗剪强度特性的环剪试验[J]. 岩土力学,2018,39(6):2082-2088. (HUANG Hongxiang, CHEN Yumin, WANG Jianping, et al. Ring shear tests on shear strength of calcareous sand[J]. Rock and Soil Mechanics, 2018, 39(6): 2082-2088. (in Chinese) [9] 国家质量技术监督局, 中华人民共和国建设部. 土工试验方法标准[2007版]: GB/T 50123—1999[S]. 北京: 中国计划出版社, 1999. State Bureau of Quality and Technical Supervision, Ministry of Construction of the People's Republic of China. Standard for soil test method: GB/T 50123—1999[S]. Beijing: China Planning Press, 1999. (in Chinese) [10] DUNCAN J M, CHANG C Y. Nonlinear analysis of stress and strain in soils[J]. Journal of the Soil Mechanics and Foundations Division, 1970, 96(5): 1629-1653. [11] 徐远杰, 王观琪, 李健, 等. 在ABAQUS中开发实现Duncan-Chang本构模型[J]. 岩土力学,2004,25(7):1032-1036. (XU Yuanjie, WANG Guanqi, LI Jian, et al. Development and implementation of Duncan-Chang constitutive model in ABAQUS[J]. Rock and Soil Mechanics, 2004, 25(7): 1032-1036. (in Chinese) doi: 10.3969/j.issn.1000-7598.2004.07.005 [12] 沈珠江. 理论土力学[M]. 北京: 中国水利水电出版社, 2000. SHEN Zhujiang. Theoretical soil mechanics[M]. Beijing: China Water and Power Press, 2000. (in Chinese) -
下载:
点击查看大图
计量
- 文章访问数: 634
- HTML全文浏览量: 316
- PDF下载量: 26
- 被引次数: 0
