沉积泥沙自重固结系数测试方法研究

郭帅杰; 张福海; 宋绪国

doi:10.11779/CJGE2017S1014

沉积泥沙自重固结系数测试方法研究 English Version

1. 铁道第三勘察设计院集团有限公司,天津 300251;
2.城市轨道交通数字化建设与测评技术国家工程实验室,天津 300251;
3. 河海大学岩土工程科学研究所,江苏南京 210098

详细信息

作者简介:
郭帅杰(1987-),男,博士,博士后,主要从事软基加固、刚性桩复合地基设计计算方面的科研和设计工作。E-mail:ggssjj@hhu.edu.cn。

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出版历程
- 收稿日期: 2016-12-01
- 发布日期: 2017-11-19

Test methods for self-weight consolidation coefficient of deposited sediment

1. The Third Railway Survey and Design Institute Group Corporation, Tianjin 300251, China;
2. National Engineering Laboratory for Digital Construction and Evaluation Technology of Urban Rail Transit, Tianjin 300251, China;
3. Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China

摘要

摘要: Terzaghi理论中的固结系数为定值,应用于沉积泥沙大变形固结计算时存在较大误差,而沉积泥沙固结系数的试验测定仍存在一定困难。沉降柱试验能完整的模拟低浓度泥沙的沉积固结过程,准确获取泥沙沉降过程曲线和沉积层体积分数分布曲线。在此基础上,基于不同阶段泥沙沉降过程控制方程,通过作图方法得到沉降控制方程的拟合参数,得到了随固结过程连续变化的沉积泥沙自重固结系数。根据固结过程中的沉积泥沙渗透系数和体积压缩系数变化规律,同样得到四种不同的固结系数求解方法,并讨论了各影响因素对沉积泥沙自重固结系数的影响趋势。
- 沉降试验 /
- 沉积泥沙 /
- 自重固结系数 /
- 大变形固结
Abstract: The consolidation coefficient in the Terzaghi theory is constant. It will cause significant errors if it is directly applied in the calculation of large strain consolidation of deposited sediment. Meanwhile, it is still extremely difficult to obtain the self-weight consolidation coefficient of deposited sediment. Especially, the sediment deposition and consolidation process can be simulated using the sediment settlement experiment with realtively row initial concentration, and the curves of sediment settlement and deposited layer particle volume fraction also can be obtained accordingly. Based on the sediment settlemen control equations for different settlement stages, the fitted sediment settlment parameters can be determined through the mapping method, and then the self-weight consolidation coefficient of deposited sediment at different consolidation stages can be calculated. According to the change laws of hydraulic conductivity and volumetric compression coefficient, four methods for the consolidation coefficient are discussed, and the the trends and main influence factors are studied.
- settlement column experiment /
- deposited sediment /
- self-weight consolidation coefficient /
- large strain consolidation

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参考文献(10)

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