富水破碎岩体注浆加固实验与机制研究

发布时间：2018-03-06 23:23

本文选题：岩石力学　切入点：富水破碎岩体　出处：《岩石力学与工程学报》2017年01期 　论文类型：期刊论文

【摘要】：采用模拟富水破碎岩体注浆的方法,开展普通硅酸水泥42.5#(PO.42.5)、硫铝酸盐水泥42.5#(SAC.42.5)和自主研发水泥基复合注浆材料(CGM)的注浆加固效果实验。通过对比破碎灰岩和破碎砂岩试样注浆后结石体的单轴压缩实验结果发现,岩体破碎程度越高,注浆后强度改善效果越明显,岩石孔隙率越大,注浆后韧性增强显著。CGM材料对应注浆加固结石体强度显著高于PO和SAC材料,对多孔隙砂岩的刚性改善效果最优,且结石体沿岩浆界面产生滑移破坏的概率最小,SAC材料次之,PO材料最差。采用扫描电子显微镜测试手段,分析岩浆界面过渡区域矿物种类及分布形态,揭示了不同水泥类材料注浆效果产生差异的原因,从微观角度确定了岩浆界面的胶结类型主控因素为岩石的岩性,与水泥材料类型无关。对于致密度高的灰岩类岩石属于Ollivier-Grandet模型,对于多孔隙砂岩类岩石属于Zimbelinan模型。结合对岩浆界面过渡区域X射线衍射分析和元素扫描分析结果,证明注浆不仅改善岩石的物理力学性能,还会引发岩石组分发生化学变化,在界面区域生成类岩石矿物,可提高岩浆界面胶结强度。
[Abstract]:The grouting method is used to simulate the water-rich broken rock mass. Experiments were carried out on the grouting effect of ordinary Portland cement (42.5 #CPO. 42.5), sulphoaluminate cement (42.5 #SAC.42.5) and cement based composite grouting material (CGM). The results of uniaxial compression tests of crushed limestone and crushed sandstone samples after grouting were compared. The higher the degree of rock mass fragmentation, the more obvious the effect of strength improvement after grouting, the bigger the porosity of rock, the stronger the toughness after grouting. The strength of stone body strengthened by CGM is significantly higher than that of PO and SAC. The effect of improving the rigidity of porous sandstone is the best, and the probability of slip failure of stone body along the interface of rock and slurry is the lowest and the lowest is the material of SAC and PO. The scanning electron microscope (SEM) is used to test the results. The types and distribution of minerals in the transition zone of rock / mud interface are analyzed, and the causes of different grouting effects of different cement materials are revealed. From the microscopic point of view, it is determined that the main controlling factor of cementation type of rock / mud interface is the lithology of rock. It has nothing to do with the type of cement material. It belongs to Ollivier-Grandet model for high density limestone rocks and Zimbelinan model for porous sandstone rocks. The results of X-ray diffraction analysis and elemental scanning analysis are combined with the results of X-ray diffraction analysis and elemental scanning analysis for the transition zone between rock and slurry interface. It is proved that grouting not only improves the physical and mechanical properties of rock, but also leads to chemical changes of rock composition, and forms rock-like minerals in the interface area, which can improve the cementation strength of the interface between rock and slurry.
【作者单位】：山东大学岩土与结构工程研究中心;长崎大学工学部地盘环境研究室;山东科技大学矿山灾害预防控制省部共建国家重点试验室培育基地;
【基金】：国家重点基础研究发展计划(973)项目(2013CB036001) 国家自然科学基金青年项目(51309146) 山东大学自主创新基金项目(31410076614127)~~
【分类号】：TU45

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