K_0固结状态下土样的一种制备方法及其确定

Method of Preparing Soil Sample under K_0 Consolidation Condition and Test of K_0 Value

为了获得K_0固结状态下的土样并测试其K_0值,利用模型槽测试系统制备了重塑K_0固结状态土样,以模型槽内固结土样为例,对其天然密度、含水率、重度等物理指标进行了测试分析,并采用经验公式法、K_0固结仪、三维土压力盒原位测试三种方法分别测试了土的静止侧压力系数K_0。结果表明,通过原位测试测得的K_0系数比较准确,其他两种方法均对土体有扰动而引起误差。另外,三维土压力盒测得的两个水平方向上的应力并不完全相同,由此表明两个水平方向尺寸对K_0值存在影响。

In order to obtain the soil sample under the condition of K_0 consolidation and determine K_0 value,the soil under the condition of K_0 consolidation was prepared by the model trough test system.Taking a model tank consolidated soil sample as research object,this paper tested the natural density,moisture content,severe and other basic physical indexes.The static lateral pressure coefficient K_0 of the soil was determined by the three methods,namely empirical formula method,the K_0 consolidation apparatus,and three-dimensional soil pressure box in situ test.The results show that the K_0 coefficient measured by situ test is more accurate,the other two methods have the errors caused by the disturbance of soil.In addition,the stress level of the soil in the two horizontal directions is not exactly the same,which proves the size of the two horizontal directions have impacts on the K_0 value.