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为探讨富水充填材料在时效作用下的变形及其硬化体内水分损失特征,本文研究一定水固质量比的富水充填材料在不同应力水平下的蠕变性能,并通过扫描电镜观察、差热-热重分析等实验探讨充填体在蠕变过程前后的形变特征、水分损失及其与外界荷载的关系.结果表明:水固质量比为2.0的富水充填材料失稳破坏的临界应力为1.96 MPa,为其单轴抗压强度的90%;蠕变不会对富水充填材料中结合水含量造成影响;富水充填材料失稳破坏时内部结构发生非结合水的流失,非结合水含量损失相对值与所受荷载水平呈线性正相关关系;非结合水的流失导致结构内部出现更多的空隙,这些空隙在外界荷载作用下会迅速被压密,产生较大变形,导致充填体局部失稳,进而影响采空区的整体稳定.
In order to investigate the deformation of water-rich filler under aging and the characteristics of water loss in hardened body, the creep properties of water-filled filler at different stress levels were studied in this paper. The results of scanning electron microscopy, - TGA analysis of the deformation characteristics of the filler before and after creep process, water loss and its relationship with the external load.The results show that: the water-solid ratio of 2.0 water-rich filler material instability damage critical stress of 1.96 MPa, which is 90% of its uniaxial compressive strength; creep does not affect the water content in the water-rich filler; the loss of unbound water in the internal structure when the water-filled filler material is damaged by failure, the unbound water content There is a linear positive correlation between the relative loss and the load level. The loss of unbound water leads to more voids in the structure. These voids will be rapidly compacted under the action of external loads, resulting in large deformation, Instability, thus affecting the overall stability of the goaf.