胶新铁路软弱土路基沉降规律与变形预测研究

软弱土具有压缩性高、含水量大、强度低和透水性差等特点,在上部荷载长期作用下,必将产生一定的沉降,甚至发生于运营阶段,对铁路的运营质量造成危害。该文基于铁道部项目-胶新铁路路基沉降监测和预测研究,对不同的试验段进行了长达两年的监测,以给出规律性的结论。首先该文介绍了软弱土路基沉降及预测的研究概况,并对研究的试验段DK300进行了介绍;然后该文详细分析了该段路基的实测沉降及其变化规律,并对各断面在通车前后的累积沉降进行对比分析,得出重要结论。最后该文对软弱土路基沉降变形预测进行了详细研究,运用了组合预测方法,结果与实测值较吻合,有实用价值。

Study of Settlement Law and Deformation Forecast of Weak Soil Subgrade for Jiaoxin Railway

The weak soil has the characteristics of high compressibility, high water content, low strength and bad water permeability. Under the action of the upper load for a long time, a certain settlement must be produced and even happens in the operation stage, which will cause the danger to the operation quality of the railway. Based on the settlement monitoring and forecast study of the subgrade for Jiaoxin Railway Project of the Ministry of Railways, the article gives the law conclusion after 2-year monitoring in the different test sections. At first, the article introduces the general situation to study the settlement and forecast of the weak soil subgrade and introduces the test section DK300, then analyzes in detail the measured settlement and its variation law of the subgrade in this section, contrasts to analyze the accumulated settlements of various sections before and after opening to traffic and gives the important conclusion, finally, carries out the detail study of settlement and deformation forecast of the weak soil subgrade and applies the combined forecast method. The result more tallies with the measured value, and has the practical value.