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| Magnetic resonance image experiments on the damage feature of microbial induced calcite precipitated residual soil during freezing-thawing cycles |
| HUANG Ming1，ZHANG Jinxuan1，JIN Guixiao1，2，JIANG Yujing1，3，QIU Jiye1，GONG Hao1，GUO Shen1 |
(1. College of Civil Engineering，Fuzhou University，Fuzhou，Fujian 350116，China；2. College of Ecological Environment and Urban，Construction Fujian University of Technology，Fuzhou，Fujian 350108，China；3. Department of Civil Engineering，
Nagasaki University，Nagasaki 852–8521，Japan) |
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Abstract Microbial-induced calcite precipitation(MICP) is a good approach for cementing residual soil to the bio-claystone with high strength，and hence，is widely applied in the subgrade improvement. However，the durability of the bio-claystone in the frozen regions is still uncharted. Therefore，it is necessary to study damage characteristics of the bio-claystone under freezing-thawing cycles，which will provide references for the further engineering application of MICP. Samples of the bio-claystone of shale residual soil were prepared after grouting period and rate were determined，and freezing-thawing tests with different moistures were performed. The damage characteristics and epigenetic features of the bio-claystone samples were analyzed，and the developing process of internal pore and fissure of the bio-claystone was investigated using the nuclear magnetic resonance(NMR). It is shown that the damage of the bio-claystone under freezing-thawing cycles is resulted from that the frost heave force of pore water exceeds the bond strength of MICP. Clastic particles fall down from the surface of samples due to the invalidation of cementation，and the damage area increases with increasing the water content and the number of cycles. T2 spectral curves of the bio-claystone remarkably vary with different water contents. The development of the internal crack of the bio-claystone can be evaluated by analyzing waveform alteration with cycles. It is also indicated that lower moisture causes the development of medium and small fissures while that higher moisture results in the continuous expansion of large fissures. The destruction of the bio-claystone gradually develops from the central part to both ends of the sample. With the increment of the cycle number， the growth rate of large fractures in the central part of the sample is greater than that at both ends. In the initial stage，the“sharp point”effect occurs in the middle of the T2 curve with high moisture. With increasing cycles，however，the“sharp point”gradually disappears and the curve becomes flat. Large fractures expand from the central part to both ends and then penetrat gradually，which finally causes the failure of the bio-claystone.
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2018, Vol. 37 
