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重载铁路常常通过提高货车轴重来达到增加运量的目的,而大轴重货车运行会对路基粗颗粒土填料产生较大的循环动力作用,这容易导致路基塑性变形过大甚至使路基发生破坏,而这些病害均与粗颗粒土填料的动力破坏规律有关。为研究该类填料在动力作用下的破坏规律进行了一系列大型动三轴试验,分析了围压和含水率对填料塑性变形增长的影响,根据塑性变形增长的特点将试样分为了稳定试样和破坏试样,由此得出了临界动应力的表达公式,并探讨了不同轴重下路基破坏的可能性。此外,还分析了围压和含水率对粗颗粒土填料动强度的影响,结果表明,填料静、动强度之间具有很好的相关性,通过归一化处理提出了利用静强度推求相应动强度的公式。
Heavy-haul railways often achieve the purpose of increasing capacity by increasing the axle load of trucks. However, the operation of large-axle heavy haul trucks will cause a large cyclic dynamic effect on the coarse grained soil subgrade filler. This may easily lead to excessive plastic deformation of the subgrade and even the occurrence of roadbed Damage, and these diseases are related to the dynamic destruction of coarse grained soil filler. A series of large-scale triaxial tests were carried out to study the failure rules of this kind of packing under dynamic force. The influence of confining pressure and water content on the plastic deformation growth was analyzed. According to the characteristics of plastic deformation growth, the samples were divided into stable test And destroying the sample, the expression of the critical dynamic stress is obtained, and the possibility of subgrade destruction under different axle loads is also discussed. In addition, the effect of confining pressure and water content on the dynamic strength of coarse grained soil filler was also analyzed. The results show that there is a good correlation between the static and dynamic strength of the filler. Through the normalization, The formula of intensity.