硫氧镁水泥复合固化剂加固淤泥质土的试验研究

doi:10.13722/j.cnki.jrme.2018.0658

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摘要针对淤泥质软土含水量高、强度低、有机质含量高的特点，以节能、环保的硫氧镁水泥为主固化剂，开展镁质水泥复合固化剂加固淤泥质土的室内试验研究。首先通过分析有机质、含水量及镁质水泥掺量对淤泥质土固化效果的影响，确定硫氧镁水泥固化软土试验的基准配比，再通过双掺试验确定水玻璃、熟料和硅灰作为复合固化剂的外加剂。然后，以固化土的7 d无侧限抗压强度为评价指标，设计三因子五水平的中心组合试验，结合响应面法研制了最优硫氧镁水泥复合固化剂TZ18，最后通过电镜扫描技术分别对普通硅酸盐水泥固化土、硫氧镁水泥固化土以及TZ18固化土的微观结构进行对比分析，结果表明：与同一龄期下的前2种固化土相比，TZ18固化土生成的水化产物更多，颗粒间联结更强，微观结构特性更稳定。

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	朱剑锋
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关键词 ：土力学, 淤泥质土, 有机质, 硫氧镁水泥, 固化剂, 无侧限抗压强度, 响应面法

Abstract：On account of the poor engineering properties of muddy soft soil with high water content，low shear strength and high content of organic matter，the laboratory studies on the properties of the organic soil solidified by the composite magnesium cement-curing agent were carried out，in which the magnesium oxysulfate cement with the good performance on energy conservation and environmental protection was chosen as the main curing agent. Firstly，the basic proportion of the soft soil solidified by the magnesium oxysulfate cement was determined through analyzing the effect of the content of organic matter and water content and dosage of magnesium oxysulfate cement on the stabilized results. Secondly，the sodium silicate，clinker，and silica fume were chosen to be the additives of the composite curing agent based on the results of double-doping experiments. Then，the central composite rotatable design(CCRD) tests with three factors and five levels were designed，in which the unconfined compressive strength of the stabilized soil at 7 d age is considered to be the evaluating criterion. Furthermore，the composite magnesium oxysulfate cement curing agent-TZ18 was developed by using the response surface methodology. Finally，through using the technology of scanning electron microscope the microstructure of the TZ18 stabilized soil was analyzed by comparison with the Portland cement and magnesium oxysulfate cement stabilized soil. It was found that at the same age，TZ18 stabilized produced more hydration products，had stronger bonds between the particles and more stable micro-structural characteristics than the other two kinds of stabilized soil.

Key words： soil mechanics muddy soil organic matte magnesium oxysulfate cement curing agent unconfined compressive strength response surface methodology

引用本文:

朱剑锋，饶春义，庹秋水，刘浩旭，潘斌杰. 硫氧镁水泥复合固化剂加固淤泥质土的试验研究[J]. 岩石力学与工程学报, 2019, 38(S1): 3206-3214.
ZHU Jianfeng，RAO Chunyi，TUO Qiushui，LIU Haoxu，PAN Binjie. Experimental study on the properties of the organic soil solidified by the composite magnesium oxysulfate cement-curing agent. , 2019, 38(S1): 3206-3214.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.0658 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/3206

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