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| Experimental study on one dimensional creep behavior of loess reinforced with fiber yarn |
| CHU Feng1,SHAO Shengjun2,DENG Guohua3,CHEN Cunli2 |
(1. School of Urban Planning and Municipal Engineering,Xi?an Polytechnic University,Xi?an,Shaanxi 710048,China;
2. Institute of Geotechnical Engineering,Xi?an University of Technology,Xi?an,Shaanxi 710048,China;3. Xi?an Loess Underground Engineering Technology Consulting Co.,Ltd.,Xi?an,Shaanxi 710048,China) |
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Abstract The Loess reinforced with fiber yarn was prepared by adding a certain proportion and length of fiber yarn,originating from waste textile fabric through opening,combing and cutting,into loess,and one dimensional creep deformation characteristics of fiber reinforced loess under different vertical loads were studied by using one-dimensional creep apparatus. The test results show that,under different vertical loads,the creep strain of the fiber reinforced loess is smaller than that of the plain loess,indicating that fiber yarn reinforcement has a positive effect on restraining the creep deformation of loess. When the vertical load is greater than 400 kPa,the time for the fiber reinforced loess to reach stable creep is longer than that of the plain loess. With increasing the proportion and the length of fiber yarn,the creep strain of the loess reinforced by fiber yarn first decreases and then increases. The optimum blending ratio and the optimum blending length of fiber yarn are 0.3% and 30 mm respectively. The creep index expression was constructed to reflect the long-term strength stability of soil after entering the creep stage. When the vertical load is between 400 and 800 kPa,the creep index increases significantly. When the vertical load is greater than 800 kPa,the creep index tends to be stable. Based on the data of one-dimensional creep test,an empirical model of one-dimensional creep of loess reinforced with fiber yarn is established considering the influence of fiber yarn proportion and fiber yarn length.
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