| Citation: | Zhang Bingbing, Liu Jie, Akangjiang Tohuti, Wang Bin, Ai Yuhao. Experimental study on the dynamic response of aeolian sand subgrade reinforced by geocells at different depths[J]. Bulletin of Geological Science and Technology, 2022, 41(6): 308-315. doi: 10.19509/j.cnki.dzkq.2021.0097
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The treatment of aeolian sand subgrade has always been a difficult problem for desert highway construction.The geocell reinforcement method can provide a new path for desert highway construction. Combining the S21 line (Urumqi-Altay) desert highway subgrade field test, it is of great value and significance to study the dynamic response characteristics of different subgrade depths for the study of aeolian sand performance of geocelling reinforcement.The results show that ① The test speed has a great influence on the time-history curve fluctuation of dynamic stress, dynamic acceleration and dynamic velocity at different depths of the subgrade, and the peak values of dynamic velocity, dynamic acceleration and dynamic stress increase obviously with increasing speed. ②With the increase in the road base depth, the amplitudes of the dynamic velocity, dynamic acceleration and dynamic stress show a trend of gradual attenuation, among which the attenuation amplitude is the largest in the geocell-reinforced aeolian sand layer. ③ Along the horizontal direction of the cross section of the subgrade, the amplitude of the dynamic velocity, the amplitude of the dynamic acceleration and the amplitude of the dynamic stress attenuate exponentially. When the horizontal distance from the vibration source is 5 m, the amplitude attenuates to approximately 10%. This horizontal range can be used as a reference value for engineering design.
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