高速铁路软土路基有控注浆技术现场试验研究

Field Test on Controlled Grouting Technology for Soft Soil Subgrade of High-Speed Railway

为有效控制软土路基注浆对高速铁路轨面变形的影响,提出有控注浆的总体原则及其施工控制方法.依托长三角地区某运营高速铁路软土复合路基注浆抬升的现场试验,监测轨面变形、孔隙水压力和土体侧向位移,分析不同注浆施工控制措施对注浆抬升效果的影响;模拟分析在不同列车速度下轨面变形对列车运行安全的影响,以此为依据提出注浆引起轨面变形限值.研究结果表明:采用合理的注浆参数、层位和时间间隔和路基两侧交错注浆的控制措施,可控制轨面变形;列车运行速度越快,轨面变形越大,脱轨系数、轴重减载率和轮轴横向力也越大,列车速度大于200 km/h时,轨面整体变形与差异变形不得大于15 mm,列车速度达到300 km/h时,轨面差异变形应小于10 mm.

This study proposes the controlled grouting technology to effectively control the influence of soft soil subgrade grouting on the surface and rail surface deformation of operating high-speed railway. Field tests on grouting uplift for soft soil composite subgrade of high-speed railway, located at the Yangtze River delta, demonstrate potential feasibility and effect of this technology. T h e effect of different construction control measures on the grouting uplift was studied using data on surface deformation, pore water pressure, and lateral displacement of the soil. Simulations analyzed the influence of the rail deformation on the operational safety of the train at different train speeds. T h e deformation limit of the rail caused by grouting was determined. T h e results show that the concept of controlled grouting technology includes grouting, controlling standards, controlling measures, and monitoring. Reasonable grouting parameters, appropriate grouting layer, feasible time interval, and staggered grouting can effectively control the rail deformation. A higher train velocity implies greater deformation of the rail, which leads to a larger derailment factor, axle load shedding rate, and axlelateral force. Therefore, when the train speed is greater than 200 k m /h , the overall and differential deformation of the rail surface should not exceed 15 mm ; when the train speed reaches 300 k m^h , the deformation of the rail surface should be less than 10 mm .