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Performance of clay soil reinforced with fibers subjected to freeze-thaw cycles

机译：纤维增强冻融循环作用下粘土的性能

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摘要

In order to study the strength properties of the weak soil reinforced by fibers, a series of unconsolidated undrained triaxial compression tests of fine-grained soil subjected to freeze-thaw cycles were conducted. Experimental samples were made by adding various contents of basalt and polypropylene fibers (0, 0.25, 0.5, 0.75% of the dry weight of the soil) into clay soil; freeze-thaw cycles were performed in a closed system (0, 2, 5, 8, 10, 15 cycles). Reinforcing fibers of circular cross-section were employed. A decrease in the strength of the test samples was observed with an increase in the freeze-thaw cycle, by carrying out triaxial compression experiments. A comparison of the strength properties of clay soil between unreinforced samples and reinforced ones with different fibers was made. The greatest decrease in the strength of clay was observed in samples after 15 freeze-thaw cycles, but it was noted that the using of fibers helps to prevent a decrease in the strength of clay subjected to the freeze-thaw cycle. After 15 freeze-thaw cycles, the strength of all unreinforced and fiber-reinforced samples decreases approximately by 30-35%. When reinforcing 0.75% with polypropylene fibers, the strength increases by 70%. Inclusion of 0.75% basalt fiber increases the strength by 41.2% before freezing and by 27.1% after the 15th cycle. Cohesion of unreinforced soil after the 15th cycle is reduced from 56.9% of unreinforced soil to 50.4% with reinforcement 0.25%, up to 54.4% at 0.5% and up to 54.0% with reinforcement 0.75% basalt fiber. The resilient modulus of all samples decreases with increasing freeze-thaw cycles, however, samples which were reinforced with fiber showed an increase in the resilient modulus as compared with not reinforced samples both before and after freezing-thawing.
机译：为了研究纤维增强的弱土的强度特性，进行了一系列冻融循环的细颗粒土的非固结不排水三轴压缩试验。通过将各种含量的玄武岩和聚丙烯纤维（分别占土壤干重的0、0.25、0.5、0.75％）添加到粘土中来制备实验样品；冻融循环在密闭系统中执行（0、2、5、8、10、15个循环）。使用圆形横截面的增强纤维。通过进行三轴压缩实验，观察到样品强度的降低以及冻融循环的增加。比较了未增强样品和具有不同纤维的增强样品之间的黏土强度特性。在15次冻融循环后，样品中的黏土强度下降最大，但应注意的是，纤维的使用有助于防止经受冻融循环的黏土强度下降。经过15次冻融循环后，所有未增强样品和纤维增强样品的强度均降低了约30-35％。当用聚丙烯纤维增强0.75％的强度时，强度增加了70％。包含0.75％的玄武岩纤维可使冰冻前的强度提高41.2％，而在第15个循环后可使强度提高27.1％。在第15个循环后，未增强土壤的内聚力从未增强土壤的56.9％降低到50.25％（增强0.25％），在0.5％时高达54.4％，在增强0.75％玄武岩纤维时高达54.0％。所有样品的弹性模量都随冻融循环次数的增加而降低，但是，与未增强样品相比，用纤维增强的样品在冻融前后均显示出弹性模量的增加。

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