流变物质含量及其分布对软土蠕变特性影响的试验研究

EXPERIMENTAL STUDY FOR INFLUENCE OF CONTENT AND DISTRIBUTION OF RHEOLOGICAL MATERIAL ON SOFT SOIL CREEP PROPERTIES

采用改进的直剪蠕变仪,在相同试验条件下完成7组含有机土、石英和长石不同重量百分比及不同分布形式试样蠕变特性的测试。获得试样平均黏滞系数与流变物质含量及尺寸的关系;探讨流变物质含量及其分布形式对软土蠕变特性的影响。试验结果表明,土体平均黏滞系数随着流变物质尺寸减小及空间分布均匀性增加而减小,且存在一临界值;流变物质含量比例对蠕变特性影响显著,平均黏滞系数随着有机质含量的增加近似呈线性减少;当土体中流变物质尺寸小于临界尺寸时,即流变物质分布达到一定均匀性时,土体蠕变特性仅与流变物质含量、性质有关,而与其形状、分布形式无关。

With the improved direct shear creep apparatus,seven sets of creep tests were conducted on specimens containing organic clay,quartz and feldspar with different weight percentages and different spatial distribution under the same experimental conditions. The relationships of the sample average coefficient of viscosity with rheological material content and dimension were obtained. The influence of content and distribution of rheological material on soil creep properties were discussed. Some conclusions were drawn:the average coefficient of viscosity reduces with decreasing rheological material size as well as increasing spatial distribution uniformity, and tends to be a critical value. Rheological material content has a notably significant effect on the creep characteristic. With the increase of organic matter content,average viscosity coefficient decreases linearly. When the soil rheological material size is less than the critical size,soil creep characteristics are only related to the content and properties of rheological material,but not related to its shape and distribution form.