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充填体分层现象在分段或阶段嗣后填充采空区过程中较为常见。设置65%、70%、72%和75%4个浓度,填充次数为1、2、3和4制作不同分层胶结充填体试件,进行单轴压缩试验探究其力学强度及其破坏模式。试验结果表明:(1)相同浓度条件下,随着填充次数增多,胶结充填体的单轴抗压强度弱化效应越明显,而当浓度在65%~75%之间变化时,对应强度折减系数介于0.592~0.967;(2)充填体单轴抗压强度与填充次数之间满足二次多项式函数关系,而与料浆浓度呈对数函数分布;(3)不同分层胶结充填体的破坏模式主要表现为共轭剪切破坏和贯穿分层面的张拉破坏。低强度夹层可能是导致分层胶结充填体强度降低的原因,能够为后期填充采空区的充填体强度设计提供可靠的理论依据。
Filling layer delamination is more common during subsequent filling of gobs in sections or stages. Set the four concentrations of 65%, 70%, 72% and 75%, the filling times are 1, 2, 3 and 4 to make different layered cemented filler specimens, uniaxial compression test to explore the mechanical strength and failure modes. The results show that: (1) Under the same concentration conditions, the uniaxial compressive strength weakening effect of cemented filling body becomes more obvious with the increase of filling times, while when the concentration changes between 65% ~ 75%, the corresponding strength reduction The coefficient is between 0.592 and 0.967; (2) The relationship between the uniaxial compressive strength and filling times satisfies the quadratic polynomial function and is logarithmly distributed with the slurry concentration; (3) The failure modes are mainly manifested as the conjugate shear failure and the tensile failure across the stratification plane. The low-strength interlayer may be the reason of the decrease of the strength of the layered cemented filling body, which can provide a reliable theoretical basis for the design of the filling body strength of the later-filled goaf.