基于位移监测数据的岩土体变形阶段判别

Deformation Phase Judgment of Soil Mass Based on Monitoring Data

基于岩土材料的流变特性,将位移监测数据分解成稳定变形、时效变形和测量误差3部分,然后利用数理统计知识分别推导出当岩土体处于变形稳定阶段和时效变形阶段时的样本方差表达式,从而提出岩土体处于不同变形阶段时的监控指标。通过对某边坡工程长期位移监测数据的研究表明,利用该指标能较好的刻划出边坡的变形阶段,对于分析不同情况下的位移监测数据具有一定的指导作用。

The judgment of deformation phase is important to research the deformation and failure of soil in the project. Based on the rheological feature of geotechnic material, the monitoring data of displacement can be divided in three parts： stable deformation, secular deformation and measure error. Then the mathematical expression of sample variance indicating the soil mass in stable deformation phase or secular deformation phase is deduced, so the control index of deformation phase is put forward. The research of long term displacement monitoring data of one practical slope demonstrates that the index can distinguish the different deformation phase, and offer some instruct to the data analysis in complex condition.