Abstract The dynamic elasticity modulus and critical dynamic stress of improved soil under different confining pressures and frequencies are investigated by using GDS dynamic triaxial test system to examine the dynamic characteristics of cinder-improved soil as subgrade under medium and low confining pressure. The attenuation model of the dynamic elastic modulus was established to analyze the influence of different confining pressures and loading frequencies on the dynamic modulus. A fuzzy linear regression model based on structural element method was used according to the uncertainty of critical dynamic stress. Results show that the dynamic elastic modulus of soil decreases exponentially with the increase of loading times. The attenuation model can reflect the influence of frequency and confining pressure on the dynamic modulus of elasticity. The critical dynamic stress of soil is negatively correlated with the frequency of loading and is positively correlated with the confining pressure. The fuzzy linear regression model based on the structural element method can reflect the relationship between the critical dynamic stress and the frequency and confining pressure.
Fund:Supported by the National Natural Science Foundation of China (No. 50978131), Joint Research Project of Special Research Fund for Doctoral Programs in Colleges and Universities (No. 20112121110004)
ZHANG Xiang-dong,REN Kun. Experimental Study on Dynamic Elastic Modulus and Critical Dynamic Stress of Cinder-improved Soil Subgrade[J]. Journal of Highway and Transportation Research and Development, 2018, 12(4): 25-32.
[1] WANG Hong-xin, ZHOU Cheng-jing, CHEN Qun. Impact of Coal Cinder Content on Mechanical Properties of Ash Residue Mixture[J]. Water Resources and Power, 2015, 33(9):113-116.(in Chinese)
[2] KURAMA H, KAYA M. Usage of Coal Combustion Bottom Ash in Concrete Mixture[J]. Construction and Building Materials, 2008,22(9):1922-1928.
[3] HUANG Juan, DING Zu-de, YUAN Tie-ying, et al. Experimental Study of Dynamic Deformation Properties of Peaty Soil under Cyclic Loading[J]. Rock and Soil Mechanics, 2017, 38(9):1001-1008. (in Chinese)
[4] ZHANG Xiang-dong, FENG Sheng-yang, PAN Yu. Experimental Study on Dynamic Performance for Lime-flyash-improved Aeolian Soil[J]. The Chinese Journal of Geological Hazard and Control, 2010, 21(2):89-93. (in Chinese)
[5] ZHANG Xiang-dong, CAO Qi-kun, PAN Yu. Experiment Research of Lime-fly Ash Soil's Dynamics Characteristics[J]. Rock and Soil Mechanics, 2010, 31(8):2560-2564. (in Chinese)
[6] ZHANG Ze-lin, WU Shu-ren, TANG Hui-ming, et al. Dynamic Characteristics and Microcosmic Damage Effect of Loess and Mudstone[J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(5):1256-1268. (in Chinese)
[7] CHEN Le-qiu, ZHANG Jia-sheng, CHEN Jun-hua, et al. Test of Dynamic and Static Strength Properties of Cement-improved Argillaceous-slate Coarse-grained soil[J]. Rock and Soil Mechanics, 2017, 38(7):1-8. (in Chinese)
[8] ZHOU Bao-chun, BAI Hao, KONG Ling-wei. Discussion on Critical Dynamic Stress of Lime-treated Expansive Soil under Cyclic Loading[J]. Rock and Soil Mechanics, 2009, 30(S2):163-168. (in Chinese)
[9] LIU Gang. Study on the Design Method for Subgrade of High-speed Railway Base on the Long-term Cumulative Deformation Evolution State Controlling[D].Chengdu:Southwest Jiaotong University,2013.(in Chinese)
[10] GUNEY Y, SARI D, CETIN M,et al. Impact of Cyclic Wetting-drying on Swelling Behavior of Lime-stabilized Soil[J]. Building and Environment 2007,42(2):681-688.
[11] WERKMEISTER S, NUMRICH R, DAWSON A R, et al. Design of Granular Pavement Layers Considering Climatic Conditions[J]. Transportation Research Record, 2003, 1837:61-70.
[12] TRINH V N, TANG A M, CUI Y J, et al. Mechanical Characterisation of the Fouled Ballast in Ancient Railway Track Substructure by Large-scale Triaxial Tests[J]. Soils and Foundations 201252(3):511-523.
[13] YASUHARA K, MURAKAMI S, SONG B W, et al. Post Cyclic Degradation of Strength and Stiffness for Low Plasticity Silt[J]. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 2003, 129(8):756-769.
[14] WANG Jing, LÜ Xiang, ZHANG Yun-long,et al. Study on Relationship Static and Dynamic Moduli of Subgrade Soil in Seasonal Frozen Area[J]. Journal of Highway and Transportation Research and Development, 2016, 33(9):25-30.(in Chinese)
[15] YAN Zhi-li, LONG Jian-hui, JING Ming,et al. Study on Dynamic Modulus and Damping Ratio of Loess of Low-magnitude Multi-frequency High-intensity Seismic Regions[J]. Journal of Highway and Transportation Research and Development, 2014, 31(4):47-52,126.(in Chinese)
[16] ZHANG Xiang-dong, LIU Jia-shun, ZHANG Hu-wei. Experimental Study on Dynamic Characteristic of Soft Soil under Cyclic Loading[J]. Journal of Highway and Transportation Research and Development, 2014, 31(5):1-7,20. (in Chinese)
[17] LENG Wu-ming, LIU Wen-jie, ZHOU Wen-quan. Testing Research on Critical Cyclical Stress of Coarse-grained Soil Filling in Heavy Haul Railway Subgrade[J]. Journal of Vibration and Shock, 2015, 34(16):25-30.(in Chinese)
[18] CAI Ying, CAO Xin-wen. Study for the Critical Dynamic Stress and Permanent Strain of the Subrgade-soil under Repeated Loading[J]. Journal of Southwest Jiaotong University, 1996, 31(1):1-5.(in Chinese)
[19] LIU Xiao-hong, YANG Guo-lin, FANG Wei. Critical Dynamic Stress of Red Clay and Replacement Thickness of Ballastless Track Cutting Bed of High-speed Railways[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(3):348-353.(in Chinese)
[20] WANG Hua-dong, GUO Si-cong, YUE Li-zhu. An Approach to Fuzzy Multiple Linear Regression Model Based on the Structured Element Theory[J]. Systems Engineering-Theory & Practice, 2014, 34(10):2628-2636.(in Chinese)
[21] ZENG Fan-hui, LIU Bin, WEI Shuai. A Fuzzy Linear Regression Model Based on the Structure Element[J]. Mathematics in Practice and Theory, 2016, 46(7):162-167.(in Chinese)
[22] YANG Guang-qing. Study of Dynamic Performance of Cement-improved Soil[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(7):1156-1160.(in Chinese)
2018, Vol. 12 
