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在现场调查的基础上,针对高铁通过岩溶区域典型土样,开展了模拟高铁循环荷载作用下的动三轴试验,研究了高速列车运行荷载作用下岩溶路基土的动力特性。结果表明,振动前期土体动应变随着振动次数的增加几乎呈线性增大,振动后期动应变呈非线性增加,应变增量逐渐减小,并最终趋于稳定。随着振动次数的增加,土体中孔隙水压力逐渐增大,但总体增加幅值不大;土体破坏后,即使振动次数继续增加孔隙水压力也不再增大。因此,在岩溶地区进行高铁工程建设,一定要分析不同设计时速产生的高速循环荷载对路基稳定性的影响,采取有效防治措施,确保工程建成后列车的正常运营和行车安全。
Based on the field investigation, the dynamic triaxial tests simulating the high-speed train cyclic loading were carried out for the typical high-speed railway passing through the karst area. The dynamic characteristics of the karst subgrade soil under high-speed train running load were studied. The results show that the dynamic strain of the soil increases almost linearly with the increase of the vibration frequency in the early stage of vibration, the dynamic strain changes nonlinearly in the late stage of vibration, and the strain increment gradually decreases and finally stabilizes. With the increase of the vibration frequency, the pore water pressure gradually increases, but the overall increase amplitude is not large. After the soil failure, the pore water pressure will not increase even if the vibration frequency continues to increase. Therefore, in the construction of high-speed railway projects in karst areas, we must analyze the impact of high-speed cyclic loadings with different design speeds on roadbed stability and take effective prevention and control measures to ensure the train’s normal operation and traffic safety after the completion of the project.