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)
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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OU Xiaoduo1,2,TANG Yingchun1,2,ZHONG Ziwen1,2,SU Jian1,2. TEST RESEARCH ON EXPANSIVE FORCE UNDER SMALL DEFORMATION OF REMOLDED EXPANSIVE ROCK AND SOIL. , 2013, 32(5): 1067-1072.
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