堆载预压工程最终沉降量的计算方法研究

Stack Preloading Engineering Method for Calculating the Final Settlement

最终沉降量是计算软基固结度的重要参数,从而确定工程卸载的时间节点。对"三点法"、"经验双曲线法"和"分层总和法"3种最终沉降量的计算方法进行对比研究,并结合实际工程进行计算,根据几种计算方法的推算结果进行对比。结果表明:三点法推算结果与实测值相近,适用于短期工程最终沉降量推算;经验双曲线法在堆载期的推算结果与实测值相差较大,但满载后随时间的增长与实测沉降量较为吻合;分层总和法推算的结果与实测值存在一定的偏差,虽然分层总和法考虑因素全面,但计算时需具备相关计算参数和经验系数。3种推算最终沉降量的计算方法各有自身的优缺点,虽然推算最终沉降量的结果有差异,但每种方法在工程实际应用中都有着重要的参考意义。

Final settlement is one of the important parameters calculation of soft foundation consolidation degree, so as to determine the project time node of unloading. In this paper, comparative study is made on three kinds of methods, ' three point method', ' experience hyperbolic method' and 'layered summation method', for calculating the final settlement. Connecting with the actual engineering calculation, according to the calculation results, several calculation methodsare compared, and the results show that: the three point method calculated results is closes with the measured values, and suitable for short- term project final settlement calculation; Results calculated by experience hyperbolic method in the stack is way different with measured values, but after full load tallies it is close with the measured settlement; Results calculated by stratified summation method has certain deviation with the measured values, although factors of layered summation method have been fully considered, relevant parameters and the empirical coefficient calculation are required in the calculation. Three kinds of calculation methods for calculating the final settlement of each has their own advantages and disadvantages, although there are differences, and calculates final settlement results,each method in engineering practical application has important reference meaning.