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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。
Using the method of grouting of simulated water-rich fractured rock mass, the common silicic cement 42.5 # (PO.42.5), sulphoaluminate cement 42.5 # (SAC.42.5) and self-developed cement-based composite grouting material (CGM) Grouting reinforcement effect experiment. By comparing the uniaxial compression test results of the rock mass after the grouting of the broken limestone and the broken sandstone sample, it is found that the higher the degree of rock fragmentation is, the more obvious the strength improvement effect after grouting is. The larger the porosity of the rock is, the greater the toughness after grouting Significant. The strength of CGM reinforced grouting stone is significantly higher than that of PO and SAC, which has the best effect on improving the rigidity of porous sandstone. And the probability of slipping and destroying the stone along the rock - The worst material. By means of scanning electron microscopy, the types and distribution of minerals in the transition zone of rock-pulp interface were analyzed. The reasons for the difference in grouting effect between different cement-based materials were revealed. The main controlling factors for the cementing type of rock-cement interface were determined as Rock lithology, and cement type has nothing to do. Limestone rocks with high density belong to the Ollivier-Grandet model, and the porous sandstone rocks belong to the Zimbelinan model. Combined with the X-ray diffraction analysis and elemental scanning analysis of the transition zone of rock-pulp interface, it is proved that grouting can not only improve the physical and mechanical properties of rocks, but also lead to the chemical changes of rock components and the formation of rock-like minerals in the interface region, - pulp interface bond strength.