DYNAMIC CHARACTERISTICS AND PAVEMENT PERFORMANCE OF RED MUDSTONE SUBJECTED TO CYCLIC LOADING
KONG Xianghui1，JIANG Guanlu2，ZOU Zuyin2，LI Anhong3
(1. School of Transportation Engineering，Shandong Jianzhu University，Jinan，Shandong 250101，China；2. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；3. China Railway Eryuau Engineering Group Co.，Ltd.，Chengdu，Sichuan 610031，China)
Abstract：In order to verify the applicability of red mudstone as subgrade filling in Dazhou—Chengdu railway，laboratory dynamic triaxial tests and field cyclic loading tests were performed. The dynamic strength and deformation properties of red mudstone were investigated by the dynamic triaxial tests. After introducing the concept of dynamic stress level，the test results indicate that the critical level of dynamic stress is about 30%. By analyzing the correlation between dynamic shear stress ratio and accumulative deformation，this paper proposes a calculation model of accumulative deformation of red mudstone subjected to cyclic loads，and presents the physical meaning and determining method of model parameters. The results of field cyclic loading tests demonstrate that settlement and rate of subsidence of subgrade can meet the requirements of high-speed railway construction when using red mudstone to fill the base layer of subgrade bed. Employing the proposed prediction model to calculate the accumulative deformation of red mudstone layer，the calculated and measured values match well as the deformation is stable；but some differences are observed before deformation stability due to different conditions and loading frequencies between laboratory and field tests.
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2013, Vol. 32 
