Based on the GDS dynamic triaxial test system, a series of dynamic characteristic tests were conducted on remolded sand-mixed soft clay with varying sand contents to systematically investigate the influence of loading frequency and sand content on plastic cumulative deformation, dynamic shear modulus, and damping ratio. The results indicate that: The development of plastic cumulative deformation exhibits a rapid initial phase followed by a decelerating phase. As the number of vibrations increases, the densification of the soil skeleton inhibits the rate of plastic deformation, while higher sand content significantly amplifies the cumulative deformation. Regardless of whether the loading frequency was below or above 1.0 Hz, the dynamic shear modulus displayed a decreasing trend with increasing sand content. For every 10% increase in sand content, the modulus reduction reached 12%~18%. During vibration, the pore pressure coefficient A continuously increased, intensifying the shear contraction effect and deteriorating soil stability. Higher sand content exacerbated this phenomenon, resulting in distinct inflection points in the dynamic shear modulus and damping ratio curves (critical sand content approximately 20%). In summary, sand content significantly influences the dynamic response mechanisms of sand-mixed soft clay by altering the soil skeleton structure and drainage pathways, providing critical insights for constructing dynamic constitutive models and guiding seismic engineering design.
Wang Sui
,
Fang Yuanming
,
Zhou Zidong
,
Zhao Peng
,
Pan Shilei
. Experimental Study on the Influence of Sand Content on the Dynamic Characteristics of Remolded Soft Clay[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(3)
: 882
-890
.
DOI: 10.20174/j.JUSE.2025.03.16
[1] Shen Y, Du W, Liu H, et al. Amplitude Ratio Effect on Dynamic Characteristics of Remolded Soft Clay Under Train Loads[J]. Soil Mechanics and Foundation Engineering, 2018, 55(4): 249-257.
[2] Zhou G , Li Y , Li J , et al. Dynamic behavior of clay with different water content under planar shock conditions[J]. International Journal of Impact Engineering, 2019, 129:57-65.
[3] Pandya S, Sachan A. Experimental Studies on Effect of Load Repetition on Dynamic Characteristics of Saturated Ahmedabad Cohesive Soil[J]. International Journal of Civil Engineering, 2019, 17(6): 781-792.
[4] Qiao F, Bo J, Qi W, et al. Study on the dynamic characteristics of soft soil[J]. RSC Advances, 2020, 10(8): 4630-4639.
[5] Wang Q, Wang Y, Ma W, et al. Dynamic characteristics of post-cyclic saturated loess[J]. Applied Sciences, 2022, 13(1): 306-306.
[6] An L, Zhao X, Li D, et al. Cyclic and Post-Cyclic Behaviors of Stabilized Sand-Containing Soft Soil in Coastal Areas[J]. Sustainability, 2022, 14(22): 15017-15017.
[7] Miao Y, Sheng R, Yin J, et al. Dynamic Characteristics of Saturated Soft Clays under Cyclic Loading in Drained Condition[J]. KSCE Journalof Civil Engineering, 2020, 24(1): 443-450.
[8] 蔡玮良. 江苏大丰海域海洋黏性土动力特性试验研究[J]. 地基处理, 2022, 4(4): 303-308. (Cai Weiliang. Experimental Study on Dynamic Characteristics of Marine Cohesive Soil in the Dafeng Sea Area of Jiangsu Province[J]. Foundation Treatment, 2022, 4(4): 303-308. (in Chinese))
[9] Seed H B, Wong R T, Idriss I M, et al. Moduli and damping factors for dynamic analyses of cohesionless soils[J]. Journal of geotechnical engineering, 1986, 112(11): 1016-1032.
[10] Hardin B O, Drnevich V P. Shear modulus and damping in soils: design equations and curves[J]. Journal of the Soil mechanics and Foundations Division, 1972, 98(7): 667-692.
[11] 陈国兴,刘雪珠.南京及邻近地区新近沉积土的动剪切模量和阻尼比的试验研究[J]. 岩石力学与工程学报,2004(8): 1403-1410.(Chen Guoxing, Liu Xuezhu. Testing study on ratio of dynamic shear moduli and ratio of damping for recently deposited soils in Nanjing and its neighboring areas[J]. Journal of Rock Mechanics and Engineering, 2004(8): 1403-1410. (in Chinese))
[12] 袁晓铭,孙锐,孙静, 等.常规土类动剪切模量比和阻尼比试验研究[J]. 地震工程与工程振动, 2000(4): 133-139. (Yuan Xiaoming, Sun Yue, Sun Jing, et al. Laboratory experimental study on dynamjc shear modulus ratio and damping ratio of soils[J]. Earthquake Engineering and Engineering Vibration, 2000(4): 133-139. (in Chinese))
[13] 卢毅,卜凡,蔡田露,等.不同环境温度和含砂率对黏性土干缩开裂影响试验研究[J]. 高校地质学报, 2022, 28(6): 902-910. (Lu Yi, Bu Fan, Cai Tianlu, et al. Experimental Study on the Effects of Different Environmental Temperatures and Sand Content on Dry Shrinkage Cracking of Cohesive Soil[J]. Geological Journal of China Universities, 2022, 28(6): 902-910. (in Chinese))
[14] Al-Badran Y M, Al-Ameri A F. Effect of Adding Sand on Clayey Soil Shear Strength[A]//IOP Conference Series: Materials Science and Engineering[C]. IOP Publishing, 2020, 870(1): 012079.
[15] Zhuang Z, Yin D, C Bai C, et al. Influence of sand content on the flow characteristics of soft soil under cyclic and high-frequency vibration[J]. Earthquake Engineering and Engineering Vibration, 2019, 18(3): 487-496.
[16] Deng Y, Wu Z, Cui Y, et al. Sand fraction effect on hydro-mechanical behavior of sand-clay mixture[J]. Applied Clay Science, 2017, 135: 355-361.
[17] 代国忠, 吴晓枫. 地基处理(第3版)[M]. 重庆: 重庆大学出版社, 2020. (Dai Guozhong, Wu Xiaofeng. Foundation Treatment(The Third Edition)[M]. Chongqing: Chongqing University Press, 2020. (in Chinese))
[18] 中华人民共和国住房和城乡建设部. 土工试验方法标准(GB/T 50123-2019)[S]. 北京:中国计划出版社, 2019.(Ministry of Communications of the People's Republic of China. Standard for soil test methods.[S]. Beijing: China Planning Press, 2019. (in Chinese))
[19] 王常晶, 陈云敏. 交通荷载引起的静偏应力对饱和软黏土不排水循环性状影响的试验研究[J]. 岩土工程学报, 2007, 29(11): 1742-1747.(Wang Changjing, Chen Yunmin. Study on effect of traffic loading induced static deviator stress on undrained cyclic properties of saturated soft clay[J]. Journal of Geotechnical Engineering, 2007, 29(11): 1742-1747. (in Chinese))
[20] 黄博, 陈云敏, 姬美秀. 海浪循环荷载下海洋土的液化[A]//中国土木工程学会第九届土力学及岩土工程学术会议论文集(下册)[C]. 北京: 清华大学出版社, 2003: 434-437.(Huang Bo, Chen Yunmin, Ji Meixiu. Liquefaction of marine soil under cyclic wave loading[A]//Proceedings of the 9th Academic Conference on Soil Mechanics and Geotechnical Engineering of the Chinese Civil Engineering Society (Volume 2)[C]. Beijing: Tsinghua University Press, 2003: 434-437. (in Chinese))
[21] 蔡袁强,王军,海钧. 双向激振循环荷载作用下饱和软黏土强度和变形特性研究[J]. 岩石力学与工程学报, 2008, 27(3): 495-504. (Study on strength and deformation behaviors of soft clay under bidirectional exciting cyclic loading[J]. Journal of Rock Mechanics and Engineering, 2008, 27(3): 495-504. (in Chinese))
[22] 李广信,张丙印,于玉贞. 土力学(第2版)[M]. 北京:清华大学出版社, 2013. (Li Guangxin, Zhang Bingyin, Yu Yuzhen. Soil Mechanics(The second Edition)[M]. Beijing:Tsinghua University Press, 2013. (in Chinese))
[23] Idriss I M, Dobry R, Singh R D. Nonlinear behavior of soft clays during cyclic loading[J]. Journal of the Geotechnical Engineering Division, 1978, 104(12): 1427-1447.
[24] 王军,蔡袁强.循环荷载作用下饱和软黏土应变累积模型研究[J]. 岩石力学与工程学报,2008(2): 331-338.(Wang Jun, Cai Yuanqiang. Research on strain accumulation model of saturated soft clay under cyclic loading[J]. Journal of Rock Mechanics and Engineering, 2008(2): 331-338. (in Chinese))
