›› 2013, Vol. 34 ›› Issue (10): 2763-2768.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of strength and deformation of cylindrical hole damaged expansive soil by CT-triaxial test

WANG Shi-ji1, 2, HAN Yi1, LI Xian1, SHI Lang-jing1, ZHANG Ya-qian1, CHEN Zheng-han2   

  1. 1. College of Engineering and Technology, Southwest University, Chongqing 400716, China; 2. Department of Architectural Engineering, Logistical Engineering University of PLA, Chongqing 400041, China
  • Received:2013-03-31 Online:2013-10-09 Published:2013-10-18

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Abstract: The properties of deformation, strength and structural evolution of cylindrical hole damaged expansive soil are investigated by eight CT-triaxial tests. The results show that the strength of the samples with the cylindrical holes is significantly weakened because of the hole damage. Howerver, the hole size has little influence on the strength of the sample. The hole section area decreases when net confining pressure increases under a certain suction. The reduction of the hole section area is more obvious when the suction is larger under the same net confining pressure. Moreover, the net confining pressure plays an important role on the structural evolution of the cylindrical holes in the remolded expansive soils. The increment of the mean value (ME value) is enhanced gradually when the net confining pressure is changed from 50 kPa to 200 kPa. It means the sample becomes denser when the confining pressure is larger. Accordingly, the decrement of the standard deviation (SD value) increases gradually. The structure of the sample becomes homogenized during the test.

Key words: expansive soil, CT-triaxial test, cylindrical hole damage, structural evolution, weakening

CLC Number: 

  • TU 443
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