收稿日期: 2016-05-12
网络出版日期: 2018-05-07
基金资助
国家自然科学基金资助项目(41772303);上海市自然科学基金资助项目(17ZR1410100)
Effects of initial water content and sand content on dredger fill settlement
Received date: 2016-05-12
Online published: 2018-05-07
吹填土的沉降是非线性的变速过程, 初始含水率和掺砂量对其有直接影响. 通过沉降柱试验研究了吹填泥浆的自重沉降特性, 发现沉降过程分为 3 个阶段. 通过量筒试验进行了不同初始含水率和掺砂比吹填泥浆的静水自重沉降试验, 分别对其沉降量、沉降速率、孔隙比、沉积物含水率变化进行分析, 并研究了初始含水率和掺砂比对沉降的影响. 分析结果表明: 初始含水率较高的吹填泥浆沉降更快, 沉降量拐点出现较早, 在拐点之后沉降量变化较小; 初始含水率较低的吹填泥浆在开始阶段即存在自重固结现象, 沉降较慢, 沉降量拐点出现较晚, 较小的沉降模型甚至没有明显的拐点. 掺砂量对前期沉降量影响不大, 对自重固结阶段沉降量影响较大, 但其对初始含水率较高的吹填泥浆的沉降影响不明显.
武亚军, 魏星, 唐晶 . 初始含水率和掺砂量对吹填土沉降的影响[J]. 上海大学学报(自然科学版), 2018 , 24(2) : 278 -286 . DOI: 10.12066/j.issn.1007-2861.1798
Dredger fill settlement is a nonlinear process. The initial water content and sand content have direct effects on it. This research is carried out by settlement experiments on gravity settling characteristics. The effects of initial water content and sand content are analyzed. The settlement process is divided into three phases in which dredger fill's amount of settlement, settlement rate, void ratio and water content are analyzed. The results show that dredger fill with higher initial water content has more settling velocity, and settlement retard point appears earlier. After a settlement retard point appears, the amount of settlement becomes fewer. With lower initial water content, self-weight consolidation begins earlier, and the settlement retard point appears later. Sand content has less effect on the earlier settlement process, but has more effects on settlement in the consolidation stage. Sand content has little effects on dredger fill with high initial water content.
| [1] | Richardson J F, Zaki W N. The sediment of suspension of uniform spheres under conditions of viscous flow[J]. Chemical Engineering Science, 1954(8):65-73. |
| [2] | Been K, Sills G C. Self-weight consolidation of soft soils: an experimental and theoretical study[J]. Geotechnique, 1981,31(4):519-535. |
| [3] | 周华君, 任汝述. 长江口粘性细颗粒泥沙沉降规律[J]. 重庆交通学院学报, 1994,13(3):10-16. |
| [4] | 刘莹, 肖树芳, 王清. 吹填土室内模拟试验研究[J]. 岩土力学, 2004,25(4):518-521. |
| [5] | 詹良通, 童军, 徐洁. 吹填土自重沉积固结特性试验研究[J]. 水利学报, 2008,39(2):201-205. |
| [6] | 杨爱武, 杜东菊, 赵瑞斌, 等. 吹填泥浆沉积模拟试验研究[J]. 辽宁工程技术大学学报(自然科学版), 2010,29(4):617-620. |
| [7] | 何洪涛, 朱伟, 张春雷, 等. 分层抽取法在泥沙沉积过程中的应用研究[J]. 岩土力学, 2011,32(8):2371-2378. |
| [8] | 张楠, 朱伟, 王亮, 等. 吹填泥浆中土颗粒沉降-固结规律研究[J]. 岩土力学, 2013,36(4):1681-1686. |
| [9] | 中华人民共和国水利部. GB/T 50123—1999 土工试验方法标准 [S]. 北京: 中国计划出版社, 1999. |
| [10] | 万远扬, 吴华林, 沈淇, 等. 长江口悬沙沉速室内试验研究[J]. 海洋科学, 2015,39(8):78-85. |
| [11] | 刘林双, 杨国录, 王党伟, 等. 淤泥絮凝沉降中清浑界面沉速计算[C]// 河湖水生态水环境专题论坛. 2011: 114-130. |
| [12] | 王维, 李绍武. 黏性泥沙絮网结构形成过程研究[J]. 泥沙研究, 2014(1):68-73. |
| [13] | 郑邦民, 夏军强. 固体颗粒的群体沉降速度分析[J]. 泥沙研究, 2004(6):40-45. |
| [14] | He H T, Zhu W, Zhang C L. Experimental study on effects of initial water content on sediment deposition process [C]//Intelligent Information Technology Application Association. 2011: 71-74. |
/
| 〈 |
|
〉 |
