孔隙水压对充填体性能的影响

为探究大水矿山充填体的力学性能变化,将充填体试块置入高压水体中使其内部形成孔隙水压,研究孔隙水压下充填体的抗压强度、抗拉强度和含水量等指标的变化。试验以孔隙水压、浸入时间、充填配比和料浆浓度为主要影响因素,开展29组充填体强度试验。方差分析表明,料浆浓度和充填配比对充填体抗压强度影响极显著,孔隙水压影响显著;浸入时间对充填抗拉强度影响显著。相同充填配比和料浆浓度下的充填体抗压和抗拉强度随孔隙水压和浸入时间增长而下降,其中抗拉强度下降幅度较大。充填体含水量随孔隙水压增大而增大,增长趋势和充填体强度增大趋势相吻合。

Effect on mechanical properties of backfilling due to pore water pressure

In order to explore mechanical properties of backfilling in the mine with great water, backfilling samples are immersed into high water pressure container and pore water pressure is produced in testing samples. The backfilling mechanics and physical properties studied in the paper are included compressive strength, tensile strength and water content. 29 groups of experiment for the studying effect of backfilling strength are obtained, and the effects due to pore water pressure, time, mixture ratio of backfilling and slurry density are considered in experiment. The analysis variance shows that mixture ratio of backfilling and slurry density are very significance to compressive strength which pore water pressure is significance to, but time is significance to tensile strength. The compressive strength and tensile strength of backfilling with the same mixture ratio and slurry density are reduced with increase of pore water pressure and time, and tensile strength reduced significantly. The water content is increased with increase of pore water pressure. The growth trend of water content is consistent with the increasing trend of backfilling strength.