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| TEST RESEARCH ON EXPANSIVE FORCE UNDER SMALL DEFORMATION OF REMOLDED EXPANSIVE ROCK AND SOIL |
| OU Xiaoduo1，2，TANG Yingchun1，2，ZHONG Ziwen1，2，SU Jian1，2 |
| (1. College of Civil Engineering and Architecture，Guangxi University，Nanning，Guangxi 530004，China；2. Key Laboratory of Disaster Prevention and Structural Safety，Ministry of Education，Guangxi University，Nanning，Guangxi 530004，China) |
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Abstract A series of expansive force tests of small deformation as 0，0.2，0.5 and 1 mm were conducted on the remolded samples of expansive soil in Nanning to obtain the key influence factors of the expansive force. A formula of the expansive force with initial water content and dry density was given；and small deformation expansion force variation law was analyzed. The results show that：(1) When the expansive force test shows non-deformation，the expansive force increases exponentially with dry density increases and presents a power function relation with the initial water content. (2) Test of small deformation shows that the expansive force attenuates obviously with the deformation increases；in the condition of high dry density and low initial water content，the amplitude of attenuation are larger；otherwise smaller. Under constant dry density and initial water content，the small deformation expansive force exponentially attenuates with the deformation rate increases. (3) The expansive force ratio of non-deformation and small deformation decreases exponentially with the increase of deformation rate；when the deformation rate is 1%，the ratio of small deformation expansive force to non-deformation expansive force is 75%；this ratio is 55% when the deformation rate is 2.5%；and this ratio is 35% when the deformation rate is 5%.
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Received: 12 November 2012
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2013, Vol. 32 
