中国南海吹填岛礁原状钙质砂蠕变特征初探

doi:10.13722/j.cnki.jrme.2018.0695

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (328 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要南海岛礁吹填工程是我国的战略性工程，岛礁顶部的吹填陆域主要由珊瑚钙质砂组成。已有的研究表明，珊瑚钙质砂在恒定荷载长期作用下会产生蠕变变形。作为各种岛礁结构物的地基材料的钙质砂，其长期蠕变行为会对岛礁结构物的长期沉降变形产生影响。因此，研究南海岛礁珊瑚钙质砂的长期蠕变特征具有重要的工程意义。对取自我国南海某岛礁的原状级配珊瑚钙质砂开展了室内饱和三轴排水蠕变试验(围压100 kPa)，研究其长期蠕变特征。试验结果表明，珊瑚钙质砂的蠕变为衰减型稳态蠕变，不同应力条件下的蠕变–时间曲线在双对数坐标中均为直线，可以采用幂函数进行描述；且同一密实程度的钙质砂在不同偏应力作用下蠕变直线族基本平行，直线斜率与偏应力量级无明显关系。钙质砂蠕变阶段的体积变化趋势受蠕变之前试样的体积收缩是否充分完成控制。研究发现Mesri蠕变数学模型可以很好地描述珊瑚钙质砂的应力–应变–时间关系，最终的蠕变变形和应力水平q/(?1－?3)f呈现出高度线性正相关关系。试验前后颗粒筛分发现，低围压下钙质砂蠕变过程中颗粒破碎极不明显，表明珊瑚钙质砂在低围压条件下其蠕变变形主要是由颗粒间滑移、错动、重排列引起。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	叶剑红1
	曹梦2
	李刚3

关键词 ：土力学, 珊瑚钙质砂, 三轴蠕变试验, 蠕变特征, 蠕变模型, 南海岛礁吹填工程

Abstract：The construction of a series of reclamation islands on coral reefs in South China Sea is a strategic project of China. These reclaimed lands on the top of coral reefs mainly consist of calcareous sand. Previous studies have confirmed that coral calcareous sand could generate creep deformation under long term constant loading. As the foundation material of all kind of structures built on reclaimed coral reefs，the creep behavior of calcareous sand will definitely affect the long-term subsidence of these structures. Therefore，it is highly necessary to investigate the long-term creep characteristics of the coral calcareous sand from South China Sea. A series of tri-axial drained creep tests were performed with the samples from a coral reef island in South China Sea under the confining pressure of 100 kPa to investigate the creep characteristics of calcareous sand. The experimental results indicate that the creep of the calcareous sand is an attenuated and steady type. The curves between the creep strain and the time in double logarithmic coordinates are all straight lines under different stress conditions and can be described by a power function. It is found that，in the case of the same dry density of the calcareous sand, these straight lines corresponding to different creep deviatoric stresses are basically parallel with each other and the slopes of the straight lines are hardly affected by the creep deviatoric stress. It is also revealed that the trend of volume change of calcareous sand samples at the creep stage is mainly controlled by the process of that the volume contraction of calcareous sand samples is finished or not under shearing before the beginning of the creep stage. The research results show that Mesri creep model can effectively describe the stress-strain-time relation of the coral calcareous sand and that the final creep strain of the calcareous sand is highly linearly related to the stress level q/(?1－?3)f. Particles gradation tests before and after the creep test indicate that the creep of the calcareous sand under a low confining pressure is mainly attributed to the slipping，shifting and rearrangement between soil particles.

Key words： soil mechanics lcoral calcareous sand triaxial creep test creep characteristics creep mathematical model coral reef reclamation project in South China Sea

引用本文:

叶剑红1，曹梦2，李刚3. 中国南海吹填岛礁原状钙质砂蠕变特征初探[J]. 岩石力学与工程学报, 2019, 38(6): 1242-1251.
YE Jianhong1，CAO Meng2，LI Gang3. Preliminary study on the creep characteristics of calcareous sand from reclaimed coral reef islands in South China Sea#br#. , 2019, 38(6): 1242-1251.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0695 或 http://www.rockmech.org/CN/Y2019/V38/I6/1242

[2]	佘成学. 岩石非线性黏弹塑性蠕变模型研究[J]. 岩石力学与工程学报，2009，28(10)：2 006-2 011.(SHE Chengxue. Research on nonlinear visco-elasto-plastic creep model of rock. Chinese Journal of Rock Mechanics and Engineering，2009，28(10)：2 006-2 011.(in Chinese))
[18]	SHAHNAZARI H，REZVANI R. Effective parameters for the particle breakage of calcareous sand：An experimental study[J]. Engineering Geology，2013，159：98-105.
[6]	MARAYAMA S，MICHIHIRO K，SAKAGAMI T. Creep characteristics of sands[J]. Soils and Foundations，1984，24(2)：1-15.
[20]	LADE P V， LIGGIO JR C D，NAM J. Strain rate，creep，and stress drop-creep experiments on crushed coral sand[J]. Journal of Geotechnical and Geoenvironmental Engineering，2009，135(7)：941-953.
[4]	王者超，乔丽萍. 土蠕变性质及其模型研究综述与讨论[J]. 岩土力学，2011，32(8)：2 251-2 260.(WANG Zhechao，QIAO Liping. A review and discussion on creep behavior of soil and its models[J]. Rock and Soil Mechanics，2011，32(8)：2 251-2 260.(in Chinese))
[14]	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，2005，30(1)：147-151.(WANG Xinzhi，WANG Ren，MENG Qinshan，et al. Study of plate load test of calcareous sand[J]. Rock and Soil Mechanics，2005，30(1)：147-151.(in Chinese))
[24]	MESRI G，FEBRES-CORDERO E，SHIELDS D R. Shear stress- strain-time behavior of clays[J]. Geotechnique，1981，31(4)：537-552.
[1]	杨光华. 地基沉降计算的新方法[J]. 岩石力学与工程学报，2008，27(4)：679-686.(YANG Guanghua. New computation method for soil foundation settlements[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(4)：679-686.(in Chinese))
[11]	宋世雄，张建民. 砂土流变行为的热力学本构模型研究[J]. 岩土工程学报，2015，37(增1)：129-133.(SONG Shixiong，ZHANG Jianmin. Thermodynamic constitutive model for rheological behavior of sand[J]. Chinese Journal of Geotechnical Engineering，2015，37(Supp.1)：129-133.(in Chinese))
[21]	LADE P V. Creep，stress relaxation，and rate effects in sand[C]// Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering. Alexandria：IOS Press，2009：264-267.
[3]	马桂华，陈锦剑，王建华，等. 上海软土地区多层建筑物长期沉降特性[J]. 岩土力学，2006，27(6)：991-994.(MA Guihua，CHEN Jinjian，WANG Jianhua，et al. Long-term settlement of multi-story buildings on soft clay foundation in Shanghai[J]. Rock and Soil Mechanics，2006，27(6)：991-994.(in Chinese))
[5]	MARAYAMA S. Formulation of stress-stain-time behavior of soils under deviatoric stress condition[J]. Soils and Foundations，1983，23(2)：43-57.
[8]	张云，薛禹群，施小清，等. 饱和砂性土非线性蠕变模型实验研究[J]. 岩土力学，2005，26(12)：1 869-1 873.(ZHANG Yun，XUE Yuqun，SHI Xiaoqing，et al. Study on nonlinear creep model for saturated sand[J]. Rock and Soil Mechanics，2005，26(12)：1 869- 1 873.(in Chinese))
[10]	孙晓涵，崔向美. 高应力下西安含水层砂土蠕变特性的研究试验[J]. 南北水调与水利科技，2015，13(6)：1 133-1 137.(SUN Xiaohan，CUI Xiangmei. Experimental research on creep characteristics of aquifer sand sediments in Xi'an under high stress[J]. South-to-North Water Transfers and Water Science and Technology，2015，13(6)：1 133-1 137.(in Chinese))
[12]	朱长岐，陈海洋，孟庆山，等. 钙质砂颗粒内孔隙结构特征成分分析[J]. 岩土力学，2014，35(7)：1 831-1 836.(ZHU Changqi，CHEN Haiyang，MENG Qingshan，et al. Microscopic characterization of intra-pore structures of calcareous sands[J]. Rock and Soil Mechanics，2014，35(7)：1 831-1 836.(in Chinese))
[13]	张家铭. 钙质砂基本力学性质及颗粒破碎影响研究[博士学位论文][D]. 武汉：中国科学院武汉岩土力学研究所，2004.(ZHANG Jiaming. Study on the fundamental mechanical characteristics of calcareous sand and the influence of particle breakage[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2004.(in Chinese))
[15]	张家铭，张凌，刘慧，等. 钙质砂剪切特性试验研究[J]. 岩石力学与工程学报，2008，27(增1)：3 010-3 015.(ZHANG Jiaming，ZHNAG Ling，LIU Hui，et al. Experimental research on shear behavior of calcareous sand[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.1)：3 010-3 015.(in Chinese))
[16]	胡波. 三轴条件下钙质砂颗粒破碎力学性质与本构模型研究[博士学位论文][D]. 武汉：中国科学院武汉岩土力学研究所，2008.(BO Hu. Research on the particle breakage mechanical characteristics and constitutive model of calcareous sand under triaxial condition[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2008.(in Chinese))
[23]	KONDNER R L. Hyperbolic stress-strain response：cohesive soils[J]. American Society of Civil Engineers，1963，89(1)：115-144.
[9]	张云，薛禹群，吴吉春，等. 上海砂土蠕变变形特征的试验研究[J]. 岩土力学，2009，30(5)：1 226-1 231.(ZHANG Yun，XUE Yuqun，WU Jichun，et al. Experimental research on creep of Shanghai sands[J]. Rock and Soil Mechanics，2009，30(5)：1 226-1 231.(in Chinese))
[19]	钱琨，王新志，陈剑文，等. 南海岛礁吹填钙质砂渗透特性试验研究[J]. 岩土力学，2017，38(6)：1 557-1 564.(QIAN Kun，WANG Xinzhi，CHEN Jianwen，et al. Experimental study on permeability of calcareous sand for islands in the South China Sea[J]. Rock and Soil Mechanics，2017，38(6)：1 557-1 564.(in Chinese))
[7]	KARIMPOUR H，LADE P V. Creep behavior in Viginia beach sand[J]. Canadian Geotechnical Journal，2013，50(11)：1 159-1 178.
[17]	张家铭，汪稔，石祥峰，等. 侧限条件下钙质砂压缩和破碎特性试验研究[J]. 岩石力学与工程学报，2005，24(18)：3 327-3 331. (ZHANG Jiaming，WANG Ren，SHI Xiangfeng，et al. Compression and crushing behavior if calcareous sand under confined compression[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(18)：3 327-3 331.(in Chinese))
[22]	LV Y，LI F，LIU Y W，et al. Comparative study of coral sand and silica sand in creep under general stress states[J]. Canadian Geotechnical Journal，2017，54(11)：1 601-1 611.