| As a base of the railway track, subgrade must have sufficient strength and stability, subgrade compaction quality directly responses to the overall performance of subgrade. Learning the deformation and physical mechanical properties in the process of subgrade building have grate significance on controlling the subgrade quality. In this study, using sigma module of Geostudio software analyze B group fillings subgrade's displacement in two boundary conditions (considering basic body and non-considering basic body)at different stage of subgrade compaction, learning the settlement deformation character of subgrade in compaction process. Establishing the vibratory roller-subgrade motion equation, using Simulink software simulate the dynamic response of vibratory roller-subgrade system. Meanwhile, combining Wuhan to Guangzhou Passenger Special Line dynamic monitoring test (DK1701+400—DK1701+585), using WS-5922 data acquisition instrument and ICP accelerometer sensor which is installed on the wheel of vibration roller, collecting acceleration in the process of rolling at anytime, through analysising of vibration signals, understanding the characteristics of vibration signal in the process of strong vibration and static compatation, extracting the signal which can really responses of subgrade compaction. The results show that the vibration signal of subgrade trends to be sinusoidal signal, when the compaction quality meets "The Interim Design Provisions for Newly-built Passenger Special Line of 300-350km", the vibration acceleration is 3-5 m/s2, this conclusion paves the way for rapid non-destructive testing of subgrade compaction quality. |
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