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工程实际中软土路基工后沉降值的确定一般是先根据现场实测的软基沉降-时间变化过程曲线推算出最终沉降量,再减去已发生的沉降量即得到工后沉降量。实际上,由于地基条件、加固方式及效果的不同,仅仅根据路基施工期较短时间的沉降与时间的变化曲线来直接推算时间趋于无穷大时的最终沉降量,这种计算方法有欠合理,推算出的工后沉降有时与实际相差较大。因此,提出了一种沉降预测的新方法,即利用回旋线的曲率变化特性来分析软基沉降变化规律,用回旋线参数方程来直接推算工后沉降量,并详细研究了回旋线参数A值和沉降收敛时间t值的求解方法,结果表明,用回旋线参数方程来推算软土路基工后沉降量方法快速、简单、直接。
In engineering practice, the settlement of post-construction settlement of soft-soil subgrade is generally determined by the curve of settlement-time curve of soft foundation measured in the field. The final settlement is deduced from the curve of soft foundation settlement measured at the site. Subsequent subtraction of the existing settlement results in post-construction settlement. In fact, due to the difference of foundation conditions, reinforcement methods and effects, the calculation method of the final settlement amount when the time tends to infinity can not be calculated simply based on the curve of settlement and time of a relatively short period of time during the construction period of a subgrade. Calculated post-construction settlement sometimes differ greatly from the actual. Therefore, a new method of settlement prediction is proposed, which is to analyze the variation law of soft foundation settlement by using the curvature variation of the gyration curve, and directly calculate the post-construction settlement amount by using the cyclotron parameter equation. The parameters A And settling convergence time t value of the solution method, the results show that using the cyclotron parameter equation to calculate the post-construction settlement of soft soil embankment method is fast, simple and direct.