›› 2012, Vol. 33 ›› Issue (4): 1061-1066.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of mechanical behaviour of coarse-grained soil in unloading and reloading

CHU Fu-yong1, 2，ZHU Jun-gao1, 2，JIA Hua3，AN Shu-hong1, 2, 4   

  1. 1. Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China; 3. Nantong Zhong Fang Architectural Design & Research Institute Co. Ltd., Nantong, Jiangsu 226000, China; 4. College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Taian, Shangdong 271018, China
  • Received:2010-09-30 Online:2012-04-13 Published:2012-04-26

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Abstract: The test results of three different coarse-grained soils are obtained with conventional triaxial cyclic loading test. Based on these results, some useful conclusions are drawn from the discussion and analysis of the phenomenon of volume-contraction in unloading of coarse-grained soils: The phenomenon of the volume-contraction in unloading of coarse-grained soil is more obvious with the increasing of stress level and with the decreasing of confining pressure. According to the test data, a relationship formula among volume contraction in unloading and stress level and confining pressure is obtained. Rebound modulus presents the curve of hump shape with the increasing of stress level and the maximum is obtained when stress level is 0.7. The ratio of average rebound modulus and initial elastic modulus with monotonic loading present decrease of a power function, this ratio of soil material whose mother rock is high hardness is larger and the ratio of soil material whose mother rock is soft is smaller. The general relationship between kur and nur which is obtained from rebound in unloading and k and n which is obtained from monotonic loading is that kur is approximately from 2.46 times to 4.60 times of k and nur is approximately from 0.540 times to 0.885 times of n respectively.

Key words: coarse-grained soil, triaxial tests, volume-contraction in unloading, rebound modulus

CLC Number: 

  • TU 411.5
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