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首页> 外文期刊>Tunnelling and underground space technology >Permeability evolution of grout infilled fractures subjected to triaxial compression with low confining pressure
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Permeability evolution of grout infilled fractures subjected to triaxial compression with low confining pressure

机译：灌浆灌注骨折的渗透性进化与低限制压力进行三轴压缩的裂缝

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Fractures in rock masses not only are main flow conduit for groundwater, but also provide planes of weakness on which further displacement can more readily occur. Grouting has been widely used to reduce the permeability of fractured rocks, as well as to improve the stability of fractured rocks. Therefore, fractures infilled with grout appear extensively in practice, and may be subjected to different in-situ stress conditions during the construction and operation life of tunnels and underground spaces in fractured rock masses. To examine the stress induced changes in permeability of grout infilled fractures, we performed triaxial compression tests on fractured granite samples infilled with grout, during which continuous permeability measurements were also conducted. Both planar and rough fractures with different apertures were tested. The permeability of infilled fractures slightly decreased with increasing deviatoric stress from 0 to the crack damage stress, followed by drastic enhancement in permeability with further increasing deviatoric stress. The fracture permeability increased by about 5-10 times at the peak deviatoric stress compared with that at the deviatoric stress of 5 MPa. Both CT techniques and particle discrete element models were used to investigate the changes in the microstructures of grouts and granites, as well as the interface between them. The results show that compression induced cracks in grouts and grout-granite interfaces are the main sources for the enhancements in permeability of grout infilled fractures under triaxial compression with low confining pressures.
机译：岩体中的骨折不仅是地下水的主要流动管道，而且还提供了更容易发生进一步位移的弱点的平面。灌浆已被广泛用于降低裂缝岩石的渗透性，以及提高裂缝岩石的稳定性。因此，用灌浆填充的骨折在实践中显着显得广泛，并且在隧道隧道和地下空间的施工和运营寿命期间可能会受到不同的原位应力条件。为了检查植物灌浆骨折的渗透率的应力诱导变化，我们在填充灌浆中的裂缝花岗岩样品上进行了三轴压缩试验，在此期间还进行了连续的渗透性测量。测试具有不同孔的平面和粗糙骨折。由于从0增加到裂缝损伤应力，脱脂骨折的渗透率略微降低，随后通过进一步增加偏离偏移的渗透率而激烈增强。与5MPa的偏离应力相比，裂缝渗透率在峰值偏离引起的损失应力下增加了约5-10倍。 CT技术和粒子分立元件模型均用于研究灌浆和花岗岩的微观结构以及它们之间的界面的变化。结果表明，灌浆和灌浆花岗岩接口中的压缩诱导的裂缝是具有低限制压力下的三轴压缩下植物填充骨折的增强性的主要来源。

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