分层沉降应变率分析在昆明长水机场的应用

Application of Layered Settlement Strain Rate Analysis in Kunming Changshui Airport

分层沉降数据一般用于分析,通常采用的沉降-时间曲线分析不同深度土层沉降情况不能充分了解土层的压缩情况。对此,根据分层沉降数据分析提出应变率的概念及其计算方法,应变率指某深度处单位厚度土层单位时间内的压缩量,也可将其进行一定厚度或一定时间段的累积。分层沉降收敛判定采用应变率平均值、总沉降收敛指标和原地基沉降速率确定。该分析方法应用于昆明长水机场分层沉降数据分析,结果准确反映了不同深度土层不同时间的压缩情况,为进一步采取工程措施提供了理论支持。该方法也可应用于其他类似工程分层沉降数据分析。

Layered settlement data are used for analyze settlement in different depths generally, usually by settlement-time curves for analysis, the soil compression situation understands is inadequate. This article proposed the concept of strain rate and its calculation method in view of the layered settlement data analysis, strain rate refers to the compression of unit thickness of soil in a depth place in unit time, it can also be accumulated in certain thickness or certain time period. Layered settlement convergence was judged according to the average strain rate, total settlement convergence index and the original foundation settlement rate. This analysis method was applied to layered settlement data analysis in Kunming Changshui airport, the result accurately reflects the compression condition in different depths or different time, and provides theoretical support for further engineering measures. This method can also be applied to other similar construction projects for layered settlement data analysis.