Volume 35 Issue 5
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Ai Zhijun. Test on Dynamic Characteristics of Phosphogypsum Cement Improved Loess[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2021, 35(5): 341-346. doi: 10.3969/j.issn.1007-2993.2021.05.012
Citation: Ai Zhijun. Test on Dynamic Characteristics of Phosphogypsum Cement Improved Loess[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2021, 35(5): 341-346. doi: 10.3969/j.issn.1007-2993.2021.05.012
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Test on Dynamic Characteristics of Phosphogypsum Cement Improved Loess

doi: 10.3969/j.issn.1007-2993.2021.05.012

  • Hohhot Urban Rail Transit Construction Management Co., Ltd., Hohhot 010000, Inner Mongolia, China

  • Received Date: 2020-07-16
  • Publish Date: 2021-10-22
    Abstract
  • In order to improve the dynamic characteristics of loess subgrade and realize the resource utilization of phosphogypsum, the dynamic triaxial fatigue test of loess improved by phosphogypsum-cement with different proportion was carried out. The test results show that the dynamic characteristics of the loess improved by phosphogypsum-cement are better than that of the plain soil. With the increase of the cement ratio, the greater the dynamic elastic modulus of the loess, the smaller the damping ratio and the smaller the seismic subsidence deformation. Under the low dynamic stress, the loess only experiences the hardening stage in 10000 vibration times. With the increase of the dynamic stress, the loess begins to produce the vibration damage, and with the increase of the cement ratio, the failure mode of loess changes from ductility to brittleness; with the increase of dynamic stress, the dynamic elastic modulus increases at first and then decreases, and the damping ratio decreases at first and then increases. According to the Hardin-Drnevich hyperbolic model, the initial maximum elastic modulus of the loess improved by phosphogypsum-cement increased greatly, but the change of the initial dynamic stress is not obvious. It is proposed to determine the threshold value of the fatigue dynamic stress by the stress-strain curve of equal vibration times. Phosphogypsum cement can effectively improve the threshold value of the fatigue dynamic stress of loess. The research results can provide new methods for the loess subgrade improvement project, and also provide reference for the realization of phosphogypsum resource utilization.

     

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    • References(16)
  • [1]
    孙 昱,张炜超,任 浩,等. 黄土动力塑性变形特性的试验研究及定量分析[J]. 地震工程与工程振动,2019,39(4):139-147.
    [2]
    魏 来,卢育霞,周正华,等. 非饱和黄土动力特性及其对场地地震动参数的影响[J]. 岩土工程学报,2019,41(S2):145-148.
    [3]
    WU L,LI G X,JIANG J,MA X Y. Using vegetation correction coefficient to modify a dynamic particulate nutrient loss model for monthly nitrogen and phosphorus load predictions: a case study in a small loess hilly watershed[J]. Environmental Science and Pollution Research,2019,26(31):32610-32623.
    [4]
    XIE Y Y,CHI Y P,MENG J,et al. Grain-size and Sr–Nd isotopic compositions of dry- and wet-deposited dusts during the same dust-storm event in Harbin, China: implications for source, transport–deposition modes, dynamic mechanism and formation of eolian loess[J]. Environmental Earth Sciences,2015,74(8):6489-6502.
    [5]
    李瑞宽,吴志坚,梁庆国,等. 考虑微结构特征的黄土动力特性影响因素研究[J]. 工程地质学报,2018,26(4):905-914.
    [6]
    万战胜,杨 喆,王家鼎. 列车振动荷载作用下原状黄土动力特性试验[J]. 煤田地质与勘探,2011,39(2):47-51. doi: 10.3969/j.issn.1001-1986.2011.02.011
    [7]
    徐 鹏,骆亚生,李 焱,等. 双向动荷载下振动频率对黄土动力特性的影响[J]. 人民长江,2018,49(3):97-101.
    [8]
    褚 峰,罗静波,邓国华,等. 纤维纱加筋黄土动力变形动强度及震陷特性试验研究[J]. 岩石力学与工程学报,2020,39(1):177-190.
    [9]
    马 闫,谢婉丽,彭淑君,等. 加筋方式对黄土动力特性影响三轴试验研究[J]. 水文地质工程地质,2017,44(4):50-56.
    [10]
    高中南,钟秀梅,王 峻,等. 粉煤灰改良饱和黄土动力特性研究[J]. 世界地震工程,2019,35(3):91-98.
    [11]
    张沛云,马学宁,李善珍,等. 高速铁路水泥改良黄土路基长期动力稳定性评价[J]. 振动与冲击,2019,38(11):80-87.
    [12]
    张沛云,马学宁. 水泥改良黄土路基动力稳定性评价参数试验研究[J]. 水文地质工程地质,2019,46(2):141-147.
    [13]
    李志清,沈 鑫. 硅酸钠改良水泥基稳定磷石膏在路面基层中的试验研究[J]. 工程地质学报,2019,27(1):80-87.
    [14]
    杜婷婷,李志清,周应新,等. 水泥磷石膏稳定材料用于路面基层的探究[J]. 公路,2018,63(2):189-195.
    [15]
    丁建文,张 帅,洪振舜,等. 水泥–磷石膏双掺固化处理高含水率疏浚淤泥试验研究[J]. 岩土力学,2010,31(9):2817-2822. doi: 10.3969/j.issn.1000-7598.2010.09.021
    [16]
    张　婷, 谭　凡, 杨　哲. 尾矿粉土动力变形特性试验研究[J]. 长江科学院报, 2020, 37 (12): 146-151.
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