摘要Considering the obvious wave impedance difference between dry crust and soft the phenomenon of dynamical stress mutation at the hard-soft soil interface, which is a specific performance of shell effect of dry crust in dynamic scope, is revealed by the transmission coefficient based on stress-wave theory. The attenuation law of vertical dynamic stress peak in subgrade soil under vehicle load is obtained by numerical simulation. Based on the negative exponential function characteristic of an attenuation curve, a transfer coefficient at soil layer interface is derived. This coefficient can synthetically represent the law of dynamical stress mutation. The corresponding calculation method and application range of the transfer coefficient are offered. This calculation method has simpler processing and higher precision than existing methods based on monitoring data verification. By practice validation of expressway engineering, the mechanical state of subgrade soil can be correctly evaluated, and its residual deformation can be reduced considering the dynamic response characteristic of layer interface of soft soil subgrade with dry crust.
Abstract：Considering the obvious wave impedance difference between dry crust and soft the phenomenon of dynamical stress mutation at the hard-soft soil interface, which is a specific performance of shell effect of dry crust in dynamic scope, is revealed by the transmission coefficient based on stress-wave theory. The attenuation law of vertical dynamic stress peak in subgrade soil under vehicle load is obtained by numerical simulation. Based on the negative exponential function characteristic of an attenuation curve, a transfer coefficient at soil layer interface is derived. This coefficient can synthetically represent the law of dynamical stress mutation. The corresponding calculation method and application range of the transfer coefficient are offered. This calculation method has simpler processing and higher precision than existing methods based on monitoring data verification. By practice validation of expressway engineering, the mechanical state of subgrade soil can be correctly evaluated, and its residual deformation can be reduced considering the dynamic response characteristic of layer interface of soft soil subgrade with dry crust.
基金资助:Supported by the National Natural Science Foundation of China (No.51308486); the Post Doctoral Fund of Hebei Province (No.D2014003010); and the Ph.D.Foundation of Yanshan University (No.B712)
通讯作者:
CAO Hai-ying,E-mail address:chyysu79@126.com
E-mail: chyysu79@126.com
引用本文:
曹海莹, 刘云飞, 李慧剑, 吴吉贤. 上覆硬壳层软土路基土层界面动力响应特征及工程应用[J]. Journal of Highway and Transportation Research and Development, 2016, 10(1): 17-25.
CAO Hai-ying, LIU Yun-fei, LI Hui-jian, WU Ji-xian. Dynamic Response Characteristic of Layer Interface of Soft Soil Subgrade with Dry Crust Covering and Its Engineering Application. Journal of Highway and Transportation Research and Development, 2016, 10(1): 17-25.
[1] LU Zheng, YAO Hai-lin, LUO Xing-wen, et al. 3D Dynamic Responses of Layered Ground under Vehicle Loads[J]. Rock and Soil Mechanics, 2009, 30(10):2965-2970. (in Chinese)
[2] TANG Lian-sheng, LIN Pei-yuan, WU Ke, et al. Response Characteristics of Dynamic Stress of Subgrade Soil under Vehicle Loads[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(11):1745-1749. (in Chinese)
[3] LIU Han-long. A Review of Recent Advances in Soil Dynamics and Geotechnical Earthquake Engineering[J]. China Civil Engineering Journal, 2012, 45(4):148-164. (in Chinese)
[4] AUERSCH L. The Effect Of Critically Moving Loads on the Vibrations of Soft Soils and Isolated Railway Tracks[J]. Journal of Sound and Vibration, 2008, 3l (3):587-607.
[5] CAO Hai-ying, DOU Yuan-ming. The Characteristics of Dry Crust's Stress Dispersion in Two-layered Roadbed and It's Engineering Application[J]. Journal of Highway and Transportation Research and Development, 2012, 29(2):29-34. (in Chinese)
[6] ZHANG Qi-yi, WANG Qing-hua, WANG Qi. Study on Punch through Depth of Two-layered Soil Foundation under Strip Footing[J]. Journal of Railway Engineering Society, 2011(11):36-39. (in Chinese)
[7] ZHENG Jian-long, ZHOU Chi-qing, ZHANG Jun-hui. Summary of 1-D Consolidation Characteristics of Double-layered Ground[J]. Journal of Changsha University of Science and Technology:Natural Science Edition, 2012, 9(1):1-10. (in Chinese)
[8] KAZIMIEROWICZ-FRANKOWSKA K. Influence of Geosynthetic Reinforcement on the Load-settlement Characteristics of Two-layer Subgrade[J]. Geotextiles and Geomembranes, 2007, 25(6):366-376.
[9] YAN Ke-zhen, WU Luo-cheng, ZHU Xiang-ping. Dynamic Response of Elastic Half-space Soil under Moving Loads[J]. Journal of Architecture and Civil Engineering, 2011, 28(4):30-34. (in Chinese)
[10] QIU Min-yu, YU Ya-nan. Effect of Artificial Boundary on Numerical Model of Foundation under Vehicle Loads[J]. Journal of Highway and Transportation Research and Development, 2010, 27(1):39-42. (in Chinese)
[11] CHANG Li-wu, XU Yan-jie, YUE Jin-chao. Simulation Experiment of Dynamic Responses of High Temperature Frozen Subgrade to Dynamic Loading[J]. Journal of the China Railway Society, 2011, 33(11):80-84. (in Chinese)
[12] JIANG Yan, LEI Hua-yang, ZHENG Gang, et al. Fractal Study of Microstructure Variation of Structured Clays under Dynamic Loading[J]. Rock and Soil Mechanics, 2010, 31(10):3075-3080. (in Chinese)
[13] ZHAO Jun-ming, LIU Song-yu, SHI Ming-lei, et al. Experimental Study on Dynamic Response of Low Embankment under Traffic Load[J]. Journal of Sourheast University:Natural Science Edition, 2007, 37(5):921-925. (in Chinese)
[14] CHEN Gong-qi, GAO Guang-yun. Vibration Screening Effect of In-filled Trenches on Train Dynamic Loads of Geometric Irregular Track in Layered Grounds[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(1):144-153. (in Chinese)
[15] WU Shi-ming. Soil Dynamics[M]. Bejing:China Building Industry Press, 2000. (in Chinese)
[16] SUN Xiao, ZHAO Ming-jie, WANG Kui, et al. Research on Application of Wave Theory in Geotechnical Engineering[J]. Journal of Chongqing Jiaotong University:Natural Science Edition, 2013, 32(1):58-62. (in Chinese)
[17] CAO Yan-mei, XIA He. Solution of Foundation Soil Vibrations Induced by Moving Loads Based on Betti-rayleigh Dynamic Reciprocal Theorem[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(7):1467-1476. (in Chinese)
[18] XU Ping, XIA Tang-dai. Reflection and Transmission of Elastic Wave at the Interface of Nearly Saturated Soil and Elastic Soil[J]. Mechanics in Engineering, 2006, 28(6):58-63. (in Chinese)
[19] QIU Min-yu, YU Ya-nan. Analysis of Influence Depth for Roads Induced by Vehicle Load[J]. Rock and Soil Mechanics, 2010, 31(6):1822-1826. (in Chinese)
[20] WHITCOMBE D N. Elastic Impedance Normalization[J]. Geophysics, 2002, 67(1):60-62.
[21] WANG Jie-xian. Dynamic Ground and Foundation[M]. Beijing:Science Press, 2001. (in Chinese)
[22] YU Yan-hua. Study on Influence and Control of Mechanical Impact Loads to Near Buried Pipeline[D]. Beijing:China Academy of Engineering Physics, 2012. (in Chinese)
[23] WANG Li-li, REN Hui-qi, YU Ji-lin, et al. Development and Application of the Theory of Nonlinear Stress Wave Propagation[J]. Chinese Journal of Solid Mechanics, 2013, 34(3):217-240. (in Chinese)
[24] LI Jin-jun, HUANG Mao-song, WANG Yu-de. Analysis of Cumulative Plastic Deformation of Soft Clay Foundation under Traffic Loading[J]. China Journal of Highway and Transport, 2006, 19(1):1-5. (in Chinese)
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2016, Vol. 10 
