高填方路堤沉降模型现场试验

Field Test of High Embankment Settlement Model

通过单点沉降现场实测数据对软土地区兰永一级公路高填方路堤沉降规律进行分析,建立了指数模型、乘幂模型、双曲线模型、对数模型4种沉降预测模型,并将这4种模型的预测值和实测值进行对比,在此基础上,利用最小二乘法建立了指数与双曲线模型的组合模型。结果表明:4种模型中指数模型和双曲线模型的预测精度相对较高,利用指数与双曲线组合模型得到的预测曲线与实测曲线吻合良好,使误差平方和减小到22.789mm2,能够满足工程要求;高填方路堤工后沉降在730d左右的时间内基本完成,预测最终沉降量为60.44mm。

The settlement laws of high embankment on Lanzhou-Yongjing expressway in soft soil area were analyzed through in-site measuring data by single point settlement gauge. Four kinds of settlement forecasting models including exponential model, power model, hyperbolic model and logarithmic model were established and the forecasting values and measuring values of settlements were compared. Based on this, combination model of index model and hyperbolic model was established. The results show that exponential model and hyperbolic model are relatively accurate in the four kinds of models, the forecasting curves of combination model of index model and hyperbolic model agreed with the measuring curves, and the error sum of squares is 22. 789 mm2 , which satisfy the need of engineering, the post-construction settlement of high embankment will finish within about 730 d, the forecasting final settlement is 60.44 ram.