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针对高水材料巷旁充填体具有蠕变特性的特点,采用自行研制的大尺寸(1500 mm×600mm×900 mm)蠕变实验系统和FLAC3D数值模拟软件对其蠕变特征进行了试验研究,分析了高水材料充填体蠕变过程中瞬时、稳定及加速3个阶段位移和应力随时间的变化特征,指出充填体蠕变极限载荷随高水速凝材料水灰比降低而提高;结合充填体在加速蠕变阶段变形速度过大的特点,为确保井下充填体长期稳定,需保证充填体保持在稳定蠕变阶段,认为充填体载荷不超过其强度的70%~80%时较为合理。
In view of the creep characteristics of the high-water-side material, the creep characteristics of large-size (1500 mm × 600 mm × 900 mm) creep experiment system and FLAC3D numerical simulation software have been experimentally studied and analyzed The characteristics of displacement and stress over time in three stages of transient, steady and accelerated creep of high-water material filling body are analyzed. It is pointed out that the creep limit load of filling body increases with the decrease of water-cement ratio of high-water quick setting material. In the accelerated creep stage, the deformation rate is too large. In order to ensure the long-term stability of the downhole filling body, it is reasonable to ensure that the filling body stays in stable creep stage and that the filling body load does not exceed 70% ~ 80% of its strength.