Comparative Study on Creep Characteristics of Fine Coral Sand, Quartz Sand and Cohesive Soil
-
摘要: 珊瑚砂吹填地基主要由耙吸或绞吸吹填的珊瑚砂、珊瑚枝、礁灰岩碎块构成，珊瑚砂颗粒大小不均、分布无规律，颗粒存在棱角和内孔隙，珊瑚砂地基的长期缓慢变形是建构筑物变形控制的重点。通过室内135天的蠕变试验，将细颗粒珊瑚砂、石英砂、黏性土的蠕变特征进行对比分析发现，细颗粒珊瑚砂与石英砂的蠕变特征相似，与黏性土存在明显区别，在较低荷载水平下，细颗粒珊瑚砂地基的长期变形可依据石英砂的研究成果进行估算。Abstract: The hydraulic fill foundation for coral sand is mainly composed of coral sand, coral branches and reef limestone fragments, which are dredged by trailing suction or cutter suction. The coral sand particles are uneven in size and irregular in distribution, with edges and internal pores. The long-term slow deformation of coral sand foundation is the key point of deformation control of buildings. Through the creep test indoor in 135 days, the creep characteristics of fine coral sand, quartz sand and cohesive soil are compared and analyzed. It is found that the creep characteristics of fine coral sand and quartz sand are similar, and they are obviously different from cohesive soil. Under lower load level, the long-term deformation of fine coral sand foundation can be estimated based on the conclusions from quartz sand.
-
Key words:
- coral sand /
- quartz sand /
- cohesive soil /
- creep
-
表 1 样品描述
序号 样品名称 样品来源地 仪器编号 初始干密度/（g·cm−3） 1 石英砂 中国北京 55 1.42 2 56 1.42 3 57 1.42 4 黏性土 中国天津 58 1.85 5 59 1.85 6 60 1.85 7 珊瑚砂 马尔代夫机场岛 43 1.42 8 44 1.42 9 45 1.42 10 珊瑚砂 马尔代夫机场岛 61 1.60 11 63 1.60 12 铁块 62 
下载: 导出CSV
-
[1] WANG X Z,JIAO Y Y,WANG R,et al. Engineering characteristics of the calcareous sand in Nansha Islands, South China Sea[J]. Engineering Geology,2011,120:40-47. doi: 10.1016/j.enggeo.2011.03.011 [2] 曹 梦,叶剑红. 中国南海钙质砂蠕变–应力–时间四参数数学模型[J]. 岩土力学,2019,40(5):1771-1777. [3] 叶剑红,曹 梦,李 刚. 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. [4] 张小燕,蔡燕燕,王振波,等. 珊瑚砂高压力下一维蠕变分形破碎及颗粒形状分析[J]. 岩土力学,2018,39(5):1573-1580. [5] 王新志,王 星,翁贻令,等. 珊瑚砂的干密度特征及其试验方法研究[J]. 岩土力学,2016,37(S2):316-322. [6] 姚 婷. 珊瑚礁砾石土压实特性试验研究[D]. 武汉: 中国科学院武汉岩土力学研究所, 2013. [7] 莫洪韵. 岛礁珊瑚砂、岩混合料工程力学性能研究[D]. 南京: 东南大学, 2015. [8] 余湘娟,董卫军,殷宗泽. 软土次固结系数与压力的关系[J]. 河海大学学报(自然科学版),2008,36:63-66. [9] 余湘娟,殷宗泽,高 磊. 软土的一维次固结双曲线流变模型研究[J]. 岩土力学,2015,36(2):320-324. [10] MCDOWELL G R,KHAN J J. Creep of granular materials[J]. Granular Matter,2003,5(3):115-120. doi: 10.1007/s10035-003-0142-x [11] YIN J H. A new simplified method and its verification for calculation of consolidation settlement of a clayey soil with creep [D]. Hong Kong: The Hong Kong Polytechnic University, 2016. [12] LADE P V,LIGGIO C D,NAM J,et al. Strain rate, creep, and stress drop-creep experiments on crushed coral sand[J]. Journal of Geotechnical and Geoenvironmental Engineering,2009,7:941-953. [13] KIM D K. Comparisons of overstress theory with an empirical model in creep prediction for cohesive soils[J]. KSCE Journal of Civil Engineering,2005,9(6):489-494. doi: 10.1007/BF02831485 [14] 王笃礼,李建光,李 兴. 基于干密度指标的珊瑚砂吹填地基机场跑道沉降计算[J]. 岩土工程技术,2020,34(2):106-110. doi: 10.3969/j.issn.1007-2993.2020.02.009 [15] 王笃礼,肖国华,李 兴,等. 基于振动碾压下沉量对比的一种珊瑚砂层次压缩系数推测方法[J]. 岩土工程技术,2019,33(2):75-78. doi: 10.3969/j.issn.1007-2993.2019.02.004 [16] 王笃礼,王 璐,蒋柏坤,等. 马尔代夫珊瑚砂孔隙比试验研究及无核密度仪应用初探[J]. 岩土工程技术,2019,33(5):259-262. doi: 10.3969/j.issn.1007-2993.2019.05.003 [17] GB/T 50123—2019 土工试验方法标准[S]. 北京: 中国计划出版社, 2019 . [18] 林宗元. 岩土工程试验监测手册[M]. 沈阳: 辽宁科学技术出版社, 1994. [19] KNAPPETT J A, CRAIG R F. Craig’s Soil Mechanics(eighth edition)[M]. London and New York: Spon Press, 2012. -
图(16) / 表(1)
计量
- 文章访问数: 52
- HTML全文浏览量: 14
- PDF下载量: 19
- 被引次数: 0
