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Ariake填海堤防（Saga Pref。）的情况下，因为土壤层组成和地基地面的土壤特性都没有局部差异，因此由于波浪耗散混凝土块的建立而导致的残留设置行为尚无局部差异。 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 setting tendency was remarkable.The following main results about the mechanical properties of Ariake Clays were obtained: (1)The Hvorslev's strength Ariake粘土的参数自然取决于晶粒尺寸的分布。（2）Ariake粘土的不可逆性比（∧）在0.6至0.8范围内，并且在晶粒尺寸分布和可塑性指数上均独立。（3）Ariake粘土的压缩指数（C_C）在很大程度上取决于天然空隙比。（4）使用恒定应变载荷获得的合并测试获得的合并屈服应力（P_C）高于使用增量载荷从合并测试获得的合并应力。但是，考虑到干旱时的地面延续，基础地面土壤特性的复杂性以及土壤测试数据的可靠性，依此类推，在维持恢复二报后，强烈建议对连续现场观察的需求和实用性得到强烈建议。