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首页> 外文期刊>Journal of geotechnical and geoenvironmental engineering >Suction-Controlled Laboratory Test on Resilient Modulus of Unsaturated Compacted Subgrade Soils
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Suction-Controlled Laboratory Test on Resilient Modulus of Unsaturated Compacted Subgrade Soils

机译：吸力控制的非饱和压实路基土的弹性模量试验

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Conventionally, the resilient modulus test is conducted in the laboratory under different moisture content in which matric suction is unknown during the test. To investigate the influence of the matric suction on the resilient modulus, this study integrated the suction-controlled testing system and developed a modified testing procedure for the resilient modulus test of unsaturated subgrade soils. Based on the axis-translation technique, two cohesive soils were tested to investigate the effect of matric suction on resilient modulus. In the modified testing procedure, in order to fulfill the equilibrium in matric suction, the number of load cycles at each loading sequence of the resilient modulus test (AASHTO T 292-91) needs to be increased significantly. Experimental data indicate that matric suctions measured in the specimen after consolidation and resilient modulus tests are consistent with the matric suctions deduced from the soil-water characteristic curve corresponding to the same moisture content. In general, the resilient modulus obtained by the suction-controlled resilient modulus test appears to be reasonable. The trends of resilient modulus obtained by the suction-controlled resilient modulus test are consistent with those obtained by the conventional resilient modulus test. However, the suction-controlled resilient modulus test provides better insights that can help in interpreting the test results.
机译：常规地，弹性模量测试是在实验室中的不同水分含量下进行的，在测试过程中基质吸力是未知的。为了研究基质吸力对弹性模量的影响，本研究集成了吸力控制的测试系统，并为非饱和路基土的弹性模量测试开发了改进的测试程序。基于轴平移技术，测试了两种粘性土壤，以研究基质吸力对弹性模量的影响。在改进的测试程序中，为了实现矩阵吸力的平衡，需要显着增加弹性模量测试（AASHTO T 292-91）的每个加载序列的加载循环数。实验数据表明，固结和弹性模量试验后在样品中测得的基质吸力与从土壤水特征曲线推导的水分含量相同的基质吸力一致。通常，通过抽吸控制的弹性模量测试获得的弹性模量似乎是合理的。通过抽吸控制的弹性模量测试获得的弹性模量趋势与通过常规弹性模量测试获得的趋势一致。但是，吸力控制的弹性模量测试提供了更好的见解，可以帮助解释测试结果。

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