PAN Cheng,QI Changqing,LIU Jin,et al.Influence of Temperature Change on Strength Characteristics of Polymer‑reinforced Sand[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(03):643-649.
PAN Cheng,QI Changqing,LIU Jin,et al.Influence of Temperature Change on Strength Characteristics of Polymer‑reinforced Sand[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(03):643-649. DOI: 10.13409/j.cnki.jdpme.201901032.
Influence of Temperature Change on Strength Characteristics of Polymer‑reinforced Sand
As global warming continues, extreme climate brings new challenges to the prevention and control of geological disasters. Moreover, the sand has no cohesive force and loose structure, leading to a series of engineering geological problems. In the present study, the unconfined compressive strength of polymer-reinforced sand under different temperature conditions was determined, and the microstructure of the reinforced sand was studied by scanning electron microscope (SEM). The results show that the strength and elastic modulus of reinforced sand increased with the content of polymer curing agent at the same temperature. With the increase of temperature, the strength and elastic modulus of reinforced sand remained an increasing trend, but gradually level off beyond 35 ℃, especially for the sand reinforced by 3% and 4% contents of polymer curing agent. Polymer curing agent solutions evenly dispersed inside the soil matrix, and network membranes formed between sand particles as the moisture evaporated during the curing period, connecting the distant sand particles as a whole; thus, the mechanical behavior of reinforced sand can be greatly improved. In addition, with the increase of temperature, the strength of reinforced sand was further improved due to the enhancement of inter-particle binding via the contraction of membranes. Good reinforcement effect of polymer curing agent on the sand was observed even at high temperature. The results from this study can provide some beneficial knowledge for soil improvement by using polymers in the actual applications,it can offer a new way for wind-proof and sand-fixing reinforcement in high-temperature areas.
关键词
Keywords
references
Naeini S A , Naderinia B , Izadi E . Unconfined compressive strength of clayey soils stabilized with waterborne polymer [J]. KSCE Journal of Civil Engineering , 2012 , 16 ( 6 ): 943 - 949 .
Santoni R L , Tingle J S , Nieves M . Accelerated strength improvement of silty sand with nontraditional additives [M]. Transportation Research Record : Journal of the Transportation Research Board , 2005 .
Levy G J , Miller W P . Polyacrylamide adsorption and aggregate stability [J]. Soil and Tillage Research , 1999 , 51 ( 1/2 ): 121 - 128 .
Ben H M , Keren R . Polymer effects on water infiltration and soil aggregation [J]. Soil Science Society of America Journal , 1997 , 61 ( 2 ): 565 - 570 .
Wang Y M , Han W F , Chen W W . Experimental study on the freezing-thawing resistance of sand fixation with a new polymer material [J]. The Chinese Journal of Geological Hazard and Control , 2006 , 17 ( 4 ): 145 - 148 . (in Chinese)
Wang Y M , Han W F , Chen W W , et al . Experimental study on resistances to aging of a new polymer solidified material [J]. Journal of Engineering Geology , 2004 , 12 ( 3 ): 318 - 322 . (in Chinese)
Wang Y M , Sun G P , Chen W W , et al . Strength characteristics of sand fixated by SH [J]. Chinese Journal of Rock Mechanics and Engineering , 2003 , 22 ( Sup2 ): 2883 - 2887 . (in Chinese)
Wang Y M , Yang Ch C , Chen W W , et al . Strength characteristics and mechanism of loess solidified with new polymer material SH [J]. Chinese Journal of Rock Mechanics and Engineering , 2005 , 24 ( 14 ): 2554 - 2559 . (in Chinese)
Cai G H , Liu S Y , Cao J J . Research on micro-mechanism of carbonated reactive Mg O-stabilized silt [J]. China Civil Engineering Journal , 2017 , 50 ( 5 ): 109 - 117,132 . (in Chinese)
Liu J , Shi B , Gu K , et al . Laboratory study on soil modified by polyurethane sand-fixing agents [J]. Journal of Disaster Prevention and Mitigation Engineering , 2013 , 33 ( 1 ): 29 - 34 . (in Chinese)
Liu J , Qi X H , Zhang D , et al . Experiment on penetration resistance of surface sandy soil stabilized by polyurethane soil stabilizers [J]. Journal of Earch Sciences and Environment , 2017 , 39 ( 1 ): 126 - 134 . (in Chinese)
Wang Y , Liu J , Zhang D , et al . Stability analysis of soil slope reinforced by polymer curing agent [J]. Journal of Hebei University of Engineering (Natural Science Edition) , 2016 , 33 ( 4 ): 14 - 16,38 . (in Chinese)
Rezaeimalek S , Huang J , Bin-Shafique S . Evaluation of curing method and mix design of a moisture activated polymer for sand stabilization [J]. Construction & Building Materials , 2017 , 146 : 210 ‑ 220 .
Gao Y , Li B , Feng Zh , et al . Global climate change and geological disaster response analysis [J]. Journal of Geomechanics , 2017 , 23 ( 1 ): 65 - 74 . (in Chinese)
Liu H , Liu J K , Tai B W , et al . Mechanical properties changes of sandy silt due to freeze-thaw cycles [J]. Journal of Harbin Institute of Technology , 2018 , 50 ( 3 ): 135 - 142 . (in Chinese)
Wang L F , Tang H M , Chen H K , et al . Stability analysis of unstable rock mass under combined action of temperature and stress [J]. Journal of Disaster Prevention and Mitigation Engineering , 2017 , 37 ( 6 ): 871 - 877 . (in Chinese)
Zhou Zh W , Huang Y , Cheng F Y , et al . Experimental study on model of yunnan laterite dam slope under drying-wetting circle [J]. Site Investigation Science and Technology , 2017 ( 5 ): 1 - 7 . (in Chinese)
Hu T F , Liu J K , Fang J H , et al . Experimental study on the effect of cooling temperature on the mechanical properties of silty clay under freeze-thaw cycles [J]. Journal of Rock Mechanics and Engineering , 2017 , 36 ( 7 ): 1757 - 1766 . (in Chinese)