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利用矿渣与水泥混合固化剂对广州南沙软土进行固化处理。通过直剪试验、无侧限抗压试验对固化土样进行了力学性能研究,得出固化土体的内摩擦角、黏聚力、无侧限抗压强度随固化剂中矿渣掺入比及龄期的变化关系。通过电子显微镜观测和X射线衍射技术研究不同配比下固化土样的矿物组成及微观结构特征。研究结果表明:固化土的内摩擦角、黏聚力和无侧限抗压强度均随矿渣占固化剂比例的增大而增大,其中黏聚力增长最明显;混合固化剂的最优配比为矿渣占固化剂比例为60%;矿渣占固化剂比例越高,固化土的后期强度增长越快。这与加固土体的微观结构和矿物组成成分中的水化产物有关。
Using slag and cement mixed curing agent to Guangzhou Nansha soft soil curing. Through the direct shear test and unconfined compressive test, the mechanical properties of the cured soil samples were studied. The results showed that the internal friction angle, cohesion and unconfined compressive strength of the solidified soil were influenced by the incorporation ratio of slag in the curing agent and Age changes. The mineral composition and microstructure characteristics of solidified samples were studied by means of electron microscope and X-ray diffraction. The results show that the internal friction angle, cohesion and unconfined compressive strength of cured soil increase with the increase of the proportion of slag to curing agent, and the cohesion increases most obviously. Than the proportion of slag accounted for 60% of the curing agent; slag, the higher the proportion of curing agent, cured soil later strength increased faster. This is related to the reinforcement of the microstructure of the soil and the hydration products in the mineral components.