泥质粉砂岩化学改良土动力特性测试与分析

Test and Analysis of Dynamic Character of Chemical Improved Soil of Argillaceous Siltstone for Subgrade of High-speed Railway

研究目的:在武广高速铁路设计中,首次将泥质粉砂岩全风化物化学改良土用作高速铁路路基本体填料。高速列车的平稳、安全运营,需要路基结构物提供沉降小、刚度大、动力特性稳定的轨下支撑系统。为研究泥质粉砂岩全风化物化学改良土路基的动力特性,在试验段中预埋设动测元件,CRH3动车以300 km/h以上速度行驶时,测试泥质粉砂岩全风化物化学改良土路基的动力特性。研究结论:试验段动态测试结果表明:在保证泥质粉砂岩全风化物化学改良土的无侧限抗压强度和压实度时,可以填筑高速铁路路基本体。其填筑的路基的动响应参数和A、B组填料填筑路基的动响应参数大小基本相当,整体动力特性稳定,和无砟轨道系统形成良好的动力特性匹配。

Research purposes： The chemical improved soil of weathered argillaceous sihstone was used as the filling material of the subgrade of the Wuhan - Guangzhou High - speed Railway. The smooth and safe running of the high - speed train need the sub - rail support system with small settlement, high stiffness and stable dynamic characteristics. In order to research the dynamic characters of the chemical improved soil subgrade of weathered argillaceous siltstone, the dynamic test components were placed in the test section to test the dynamic chatacters of the chemical improved soil subgrade of weathered argillaceous sihstone when the CRH3 EMU runs at the speed over 300 km/h. Research conclnsions：The dynamic test result showed that the chemical improved soil of weathered argillaceous sihstone could be as the filling material of the subgrade of high - speed railway when it had good compression strength and compactness. It is dynamic responses characteristics were similar to the subgrade of A, B groups fillings and fit the dynamic characters of the ballastless track system.