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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。
The thixotropy of soil is one of the causes of instability accident and post-construction settlement. Studying its influencing factors and changing rules has certain practical significance for reducing engineering disasters. In order to investigate the influence of silt disturbance on its thixotropic properties, using the silt as the research object, the indoor vibration test was used to simulate the disturbed process, the unconfined compressive strength test was used to reflect the change of soil strength, and the degree of soil disturbance And its thixotropic strength of the relationship between the degree of recovery. The results show that under the same frequency and rate, the longer the vibration time is, the more disturbed the soil. In the same standing time, the degree of restoration of the absolute strength of silt is positively correlated with the degree of disturbance, while the relative intensity of the soil is restored The degree of negative correlation with the degree of disturbance. The correlation formula between soil disturbance degree and intensity recovery degree was established, which provided some basis for further study on the mechanics properties of silt project.