(1. School of Civil Engineering and Construction Engineering，Changsha University of Science and Technology，Changsha，Hunan 410004 China；2. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；3. CCCC Second Highway Engineering Co.， Ltd.，Xian，Shannxi 710061，China)
Abstract：Chemical reinforcement of soil often evaluates change of initial micro-structure under different sizes affected by strengthening material by means of all kinds of meso-tests，which reveals strengthening mechanism and estimates reinforced effect. Three types of SEM specimen such as clay without saturated by 5% concentration k2SiO3 solution，clay with saturated and dried once by the solution and clay with saturated and dried three times by the solution are prepared and respectively used to test under different SEM experiment conditions such as amplification 500 and 50 m，amplification 1 000 and 10 m and amplification 5 000 and 5 m. Phenomenological analysis of images，accumulation curve and distribution curve of ray segmentation，radar of different gray statistics(such as average，standard deviation and coefficient of variation) on sixteen subarea of images are compared and analyzed. Apparent enhancement of particle and flake edge in SEM images，sharpening of accumulation curve，elevation of distribution curve and reduction & homogenization of variation coefficient radar are all proved reinforcement effect. Clay with saturated and dried three times by 5% concentration K2SiO3 solution is integrated to be optimal reinforcement scheme，in which not only particle of soil is strengthened but also pore is partly filled. The reinforcement is comprehensive，whose homogenization is better than raw one，which does good to full play of integrity and is suitable for protection of cultural relics. If SEM test condition is designed to be amplification 500 & 50 m，shape factor of radar on variation coefficient of sixteen subarea in images increases with increasing of saturated & dried time and amplification，which do good to observe whole reinforced effect and micro-structure being particle. When amplification 5 000 & 5 m being set in SEM tests，the shape factor curve decreases with increasing of saturated & dried time and amplification，which is beneficial to observe pore partly filled effect and micro-structure being flake. During statistical analyzing of quantitative data existed in images，variation coefficient does better than average and standard deviation，which is suggested to use in image quantitative analysis.
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2016, Vol. 35 
