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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。
Stratified subsidence data is generally used for analysis. The subsidence-time curve commonly used to analyze the subsidence at different depths can not fully understand the compression of soil layers. In this regard, according to the analysis of stratified subsidence data, the concept of strain rate and its calculation method are proposed. Strain rate refers to the amount of compression per unit time of soil in a certain depth, and can also be accumulated to a certain thickness or time. The determination of stratified subsidence convergence is based on the average of strain rate, the convergence index of total subsidence and the settlement rate of original ground. The analysis method is applied to the stratified subsidence data analysis of Kunming Changshui Airport. The results accurately reflect the compression of different depths of soil layers at different times and provide theoretical support for further engineering measures. The method can also be applied to other similar projects stratified subsidence data analysis.