扰动对粉土触变强度恢复影响规律研究  

Study on the Effect of Disturbance on the Thixotropic Strength Increasing of Silt

作　　者：刘娟娟[1] 曾国红[1] 孟令帅[1] 贺武斌[1] 

机构地区：[1]太原理工大学建筑与土木工程学院,太原030024

出　　处：《地下空间与工程学报》2016年第5期1294-1299,共6页Chinese Journal of Underground Space and Engineering

摘　　要：土体的触变性是导致失稳事故和工后沉降的原因之一,研究其影响因素和变化规律对于减少工程灾害具有一定的实际意义。为了探究粉土的扰动程度对其触变特性的影响,以粉土为研究对象,采用室内振动试验模拟其受扰动过程,通过无侧限抗压试验反映其强度变化,分析土体的扰动程度与其触变强度恢复程度之间的关系。结果显示:在相同频率和速率下,振动时间越长,土体受扰动程度越大;在静置时间相同的情况下,粉土的绝对强度恢复程度与其扰动程度正相关,而其相对强度恢复程度与其扰动程度负相关。建立了土体扰动程度和强度恢复程度之间的相关关系公式,为深入研究粉土工程力学性质而提供一定依据。One of the reasons for instability accidents and post-construction settlement is the thixotropy of soils,and it is meaningful for reducing engineering disasters by studying the factors and variation of soils. To explore the influence of disturbance degree of thixotropy,take the silt as research object,the laboratory vibrating model tests are carried out to simulate soil disturbance,the change of sample＇s strength is reflected by unconfined compression tests.The results are used to analyze the relationship between the disturbance degree of silt and strength recovery degree.The results showed that,with the same frequence and the rate of vibrating,the disturbance degree increases with time. With the same stewing time,the absolute strength recovery degree of soil has positive correlation with the disturbance degree,while the relative strength recovery degree has negative correlation with the disturbance degree. Correlation formulas of the disturbance degree and the strength recovery degree are established,these formulas can be used to the further study of engineering properties of silt.

关 键 词：粉土 振动试验 扰动程度 静置 触变强度 

分 类 号：TU411[建筑科学—岩土工程]