软土路基沉降的联合法预测研究

发布时间：2018-04-01 23:11

本文选题：道路工程　切入点：软土路基沉降　出处：《西南交通大学学报》2017年05期

【摘要】：为了探究一种能同时确保先行性与准确性的软土路基沉降预测方法,依托工程实际情况,结合工程地质勘查资料、工程实测以及路基沉降试验,对所选取的典型断面进行沉降预测分析,提出了一种联合优化型的软土路基沉降预测方法.首先,采用曲线拟合法中的3种不同曲线对软土路基沉降进行预测;其次,引入最小均方差法和最大关联度法判定最优曲线;最后,采用FLAC3D数值模拟法预测软土路基沉降,将最优拟合曲线法、FLAC3D数值模拟法、实测数据三者定量对比分析.研究结果表明:沉降发生前,通过使用实验室试验数据,FLAC3D数值模拟法预测值大于实际值15%~20%,偏于安全,可较早预测施工过程中的过大沉降;沉降发生时,通过使用工程实测数据,最优曲线拟合法可以更准确的预测路基沉降全过程,且最终沉降与实测值误差不超过3%;相对于预测加固处理后的路基沉降,联合法对预测扰动较小的软土路基沉降准确率更高,准确率提升幅度为5%~10%.
[Abstract]:In order to explore a method to predict the settlement of soft soil subgrade, which can ensure the advance and accuracy at the same time, based on the actual engineering conditions, combined with the engineering geological survey data, engineering measurement and subgrade settlement test,Based on the analysis of the settlement prediction of the selected typical sections, a combined optimization method for predicting the settlement of soft soil subgrade is proposed.First, three different curves of curve fitting method are used to predict the settlement of soft soil subgrade; secondly, the minimum mean square error method and the maximum correlation degree method are introduced to determine the optimal curve; finally, the FLAC3D numerical simulation method is used to predict the settlement of soft soil subgrade.The optimal fitting curve method is compared with FLAC3D numerical simulation method and the measured data are compared and analyzed quantitatively.The results show that before the settlement occurs, the predicted value of FLAC3D numerical simulation method is larger than that of the actual value of 1520 by using the laboratory test data, which is safe and can be used to predict the excessive settlement in the construction process earlier, and when the settlement occurs, the engineering measured data can be used to predict the settlement.The optimal curve fitting method can more accurately predict the whole process of subgrade settlement, and the error between the final settlement and the measured value is less than 3. Compared with the prediction of subgrade settlement after reinforcement, the combined method is more accurate for predicting the settlement of soft soil roadbed with less disturbance.The accuracy of the increase is 5 and 10.
【作者单位】：西南交通大学高速铁路线路工程教育部重点实验室;西南交通大学土木工程学院;
【基金】：国家自然科学基金资助项目(41572245)
【分类号】：U416.1

【相似文献】