淮河入江水道崇湾段特殊软土重塑土压缩特性

Compression Behavior of Soft Clays at Chongwan Section of Huaihe-Changjiang Waterway

为研究针对淮河入江水道崇湾段堤坝下覆主要问题土层的物理力学特性,对其开展了物理、力学试验研究.确定了崇湾段软土属于有机质土且具有一定膨胀性的特殊性状.通过不同初始含水率的一维压缩试验得到崇湾段软土重塑土的压缩特性.与非有机质重塑土的压缩特性进行比较,明确相同e0/eL条件下崇湾段特殊软土具有更大的压缩性,且有机质含量较高的土体压缩性更大.通过引入Hong提出的重塑屈服压力,确定了崇湾段特殊软土重塑土的抗变形能力.相同初始含水率条件下崇湾段特殊软土的重塑屈服压力较非有机质土更大,且有机质含量较高时重塑屈服压力更大.明确了崇湾段软土的重塑屈服压力可以用Hong(2010)提出的经验公式进行预测.

A series of physico-mechanical tests were carried out on the bad soils of Chongwan section of Huaihe-Changjiang waterway to detect its physico-mechanical properties.The results indicate that the soils in Chongwan section have special physical characteristics with high organic content and a certain of expansibility.Through oedometer tests with various initial water contents on remoulded Chongwan soil,the compression characteristics of remoulded Chongwan soil were studied.Comparing with remoulded nonorganic soil,it is detected that the compressibility of Chongwan soil is bigger than nonorganic soil and it contains more organics with greater compressibility.In addition,the remoulded yield stress raised by Hong（2010）is introduced to determine the ability of remoulded Chongwan soil to resistant deformation.The remoulded yield stresses of Chongwan soil are larger than nonorganic soil with the same initial water content,and soil containing more organics has greater remoulded yield stresses.What＇s more,it is clear that the remoulded yield stresses of Chongwan soil can be predicted by the empirical formula proposed by Hong（2010）.