›› 2009, Vol. 30 ›› Issue (11): 3249-3255.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Compression deformation characteristics of saturated bentonite and sand-bentonite mixtures

SUN Wen-jing，SUN De-an，MENG De-lin   

  1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China
  • Received:2009-02-12 Online:2009-11-10 Published:2010-01-07

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Abstract:

The compression tests are completed on saturated bentonite and sand-bentonite mixtures with different preparations. The test results show that the compression curves present a bilinear shape, which is different from that of ordinary normal consolidated clays. The coefficient of lateral earth pressure of saturated bentonite at-rest is obtained by K0-oedometer; and the K0 value is greater than that of ordinary clays. The change in the lateral stress is obtained during the water uptake test on compacted sand-bentonite mixtures which is transited from unsaturated to saturated states. The compression curves of compacted specimens saturated by the water uptake test and the vacuumized methods tend to be consistent in the relatively high stress range. Thus the vacuumized method for saturating the specimens can be adopted to save time for performing the water uptake test. The concept of skeleton void ratio is used to judge if the sand skeleton is formed in sand-bentonite mixtures, and to obtain main factors affecting the compression behaviour of the mixtures.

Key words: saturated bentonite, sand-bentonite mixtures, compression curve, lateral stress, swelling test, skeleton void ratio

CLC Number: 

  • TU 411
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