Experimental study on dynamic strength and accumulated deformation characteristics of red-mudstone filling
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摘要: 高速铁路路基填料的动强度和累积变形特性是保证高速铁路正常运营的重要因素之一。为验证红层泥岩能否满足高速铁路路基基床填料的要求，进行了红层泥岩填料静、动三轴试验研究。通过静三轴试验，研究了红层泥岩填料在静荷载作用下的强度变形特性，获得了其剪切强度指标，并判定红层泥岩土能满足作为高速铁路路基填料的静强度要求；通过动三轴试验，分析了红层泥岩土作为路基基床填料在低围压条件下的动强度特性、临界动应力、弹性模量和阻尼比及累积沉降变形的变化规律，论证了红层泥岩用作高速铁路路基特别是基床底层填料的可行性，并为今后红层泥岩土在高速铁路路基中的应用提供一定的参考依据。Abstract: The dynamic strength and accumulated deformation characteristics of subgrade filling are one of the most important factors affecting the normal operation of high speed railways. In order to demonstrate the applicability of red-mudstone as subgrade bed filling, static and dynamic triaxial tests are performed. Through the static triaxial tests, the strength and deformation characteristics of red-mudstone soil are studied, the strength indices are obtained, and that red-mudstone filling can meet the static requirments of subgrade is judged. Through the dynamic triaxial tests, the dynamic strength, critical dynamic stress, elastic modulus, damping ratio and accumulated deformation of red-mudstone soil under low confining pressure are studied. According to the analysis, it is concluded that the red-mudstone soil can be used to fill subgrade bed. It may provide reference for the application of red-mudstone in subgrade engineering.
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Keywords:
- red-mudstone /
- high speed railway /
- subgrade bed /
- dynamic strength /
- accumulated deformation
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