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Investigations of the Residual Settlement of Reclamation Dikes and its Prediction Mmethods for the Introduction of Performance Based Design to the Maintenance of Reclamation Dikes

填海堤残余沉降的研究及其预测方法在填海堤维护中引入基于性能的设计

基本信息

批准号：
15580215
负责人：
HIGASHI Takahiro
金额：
$ 2.43万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

In the case of Ariake reclamation dike (Saga Pref.), because there was no local difference in both the soil layer composition and the soil properties of the foundation ground, a local difference was not recognized for the residual settlement behavior due to the wave dissipating concrete block establishment. But a local remarkable difference was seen for the ground subsidence in the drought in 1994. On the other hand, in the case of Yokoshima reclamation dike (Kumamoto Pref.) because both the soil layer composition and the soil properties of the foundation ground greatly varied in the area, the difference in the local settlement tendency was remarkable.The following main results about the mechanical properties of Ariake clays were obtained : (1)The Hvorslev's strength parameters of Ariake clays were naturally dependent on grain size distribution. (2)The irreversibility ratio (∧) of Ariake clays was in the range of 0.6〜0.8 and was independent on both grain size distribution and plasticity index. (3)The compression index (C_c) of Ariake clays was strongly dependent on the natural void ratio. (4)The consolidation yield stress (p_c) obtained from the consolidation test using constant rate of strain loading was higher than that obtained from the consolidation test using incremental loading.It was concluded that the consolidation deformation analysis by elasto-plastic finite element method (FEM) was the most suitable as the residual settlement prediction method. However, considering the influence such as groundsubsidence at a drought, the complexity of the soil properties of the foundation ground and the reliability of the soil test data, and so on, the need and utility of the continuous field observation were strongly suggested after the maintenance of the reclamation dike.

在有明填海堤（佐贺县）的情况下，由于地基的土层组成和土壤性质均无局部差异，因此未发现因设置消波混凝土块而导致的残余沉降特性的局部差异。但1994年干旱期地面沉降出现了局部显著差异。另一方面，在横岛填海围堤（熊本Pref.）本文对有明粘土的力学性质进行了研究，得到了以下主要结果：（1）有明粘土的Hvorslev强度参数与其粒径分布有着天然的相关性;（2）有明粘土的不可逆性比在0.6 ~ 0.8之间，不可逆性比与粒度分布和塑性指数无关。（3）有明粘土的压缩指数（C_c）对天然孔隙比有很强的依赖性。（4）恒速率加载固结试验所得的固结屈服应力p_c值高于增量加载固结试验所得的固结屈服应力p_c值，说明用弹塑性有限元法进行固结变形分析是最适合的残余沉降预测方法。但考虑到干旱时地面沉降、地基土性质的复杂性和土工试验数据的可靠性等因素的影响，围堤维修后进行连续现场观测的必要性和实用性。