残积土MICP灌浆结石体冻融损伤的核磁共振特性试验研究

doi:10.13722/j.cnki.jrme.2018.0430

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摘要微生物诱导碳酸钙沉淀(MICP)可有效胶结残积土并形成一定强度的结石体，在地基加固工程中具有广阔的应用前景，但针对冻土地区残积土MICP灌浆结石体的耐久性目前还不明确，因此开展结石体的冻融循环损伤特征研究对MICP技术在该地区的适用性评价具有重要意义。在试验确定微生物灌浆周期和灌浆速率的基础上，成功制备出页岩残积土的MICP灌浆结石体，并对试样开展不同含水率下的气体冻融循环试验，对比分析结石体在冻融循环过程中的损伤破坏机制与表观演化特征，重点结合核磁共振技术(NMR)研究结石体冻融后损伤裂隙发育的变化规律。结果表明：结石体的冻融破坏主要表现为孔隙水结冰产生的冻胀力大于MICP胶结强度时，胶结作用失效导致表面碎屑颗粒大量脱落，且脱落面积随含水量和循环次数的增加而增大。不同含水率结石体的T2谱曲线特征差异显著，分析波峰随循环次数增加的迁移规律可知结石体内部裂隙在冻融循环过程中的发育情况。低含水率条件下主要表现为中、小裂隙的发育，而高含水率时则体现出大裂隙的不断扩张。结石体的破坏均由试样中部逐渐向两端发展，随着循环次数的增加，结石体中间部位的大裂隙增加速率高于两端，且含水率越高速率越大，高含水率结石体T2分层曲线的初始阶段中部“尖点”效应显著，但随着冻融循环的发展“尖点”逐渐消失，曲线渐趋平缓，此时试样中部的大裂隙逐渐向两端扩展并贯穿，最终达到冻融损伤破坏的极限状态。

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	黄明1
	张瑾璇1
	靳贵晓1
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	蒋宇静1
	3
	邱继业1
	龚豪1
	郭珅1

关键词 ：岩石力学, MICP技术, 结石体, 页岩残积土, 冻融损伤, 核磁共振

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.

Key words： rock mechanics MICP technology bio-claystone shale residual soil freezing-thawing damage NMR

引用本文:

黄明1，张瑾璇1，靳贵晓1，2，蒋宇静1，3，邱继业1，龚豪1，郭珅1. 残积土MICP灌浆结石体冻融损伤的核磁共振特性试验研究[J]. 岩石力学与工程学报, 2018, 37(12): 2846-2855.
HUANG Ming1，ZHANG Jinxuan1，JIN Guixiao1，2，JIANG Yujing1，3，QIU Jiye1，GONG Hao1，GUO Shen1. Magnetic resonance image experiments on the damage feature of microbial induced calcite precipitated residual soil during freezing-thawing cycles. , 2018, 37(12): 2846-2855.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0430 或 http://www.rockmech.org/CN/Y2018/V37/I12/2846

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