富水类充填材料因其水固比高，流动性好，成本低而备受关注。同时，也由于其水固比过高而导致其充填体性能差而影响推广和应用。由于其硬化体内部存在大量钙矾石晶体和非结合水，在采场中受到开采扰动以及复杂矿井水的腐蚀作用，会使胶结充填体的平衡条件发生改变，导致富水材料硬化体结构的分解、充填体主体结构的破坏或失稳。为探讨如何提高富水充填材料的稳定性，本项目将通过研究不同应力条件下不同水固比时富水充填材料的蠕变性能及微细观结构演化特征，分析充填体在蠕变过程中硬化结晶体的形变特征、水分迁移及其与宏观力学性能的关系，提出充填体保持在稳定蠕变阶段的极限水固比以及保障充填体长期稳定的条件。通过在复杂的矿井水环境下，研究不同水固比的富水材料硬化体性能随时间的变化规律，探讨有害离子浓度、水固比对富水材料硬化体微观结构演变规律的影响，揭示其损伤、失效机理。通过分析典型矿井环境中的劣化、损伤机理，寻求控制失稳的技术途径。

Rich-water packing material is drawing much attention due to its high water-solid ratio, good fluidity and low cost. Meanwhile its promotion and application is affected by its bad performance because of too high water-solid ratio.Due to a large number of ettringite crystals and the combined water in hard, in the stope filling environment, the effect of mining and the the corroding effect of complex mine water can change the equilibrium condition of cemented filling body, leading to the decomposition of crystal structure of rich water material harden body and the instability or disruption of major structure of the cemented filling body. To discuss how to improve the stability of rich-water packing material, this project will analyze the deformation characters, water migration and the relationship of macro mechanics of hardening crystal in the process of creep and raise the ultimate water-solid ratio which can keep the packing body in the stable creep stage and the condition of its long-term stability, by studying the croop property of rich-water packing material in different stress conditions and the evolution characters of microstructure for the corresponding state. Through studying variation law with time of the performance of rich water material hardening body with different water-solid ratios under the complex environment of mine water, this project will discuss the influence of harmful ion concentration and water-solid ratio on evolvement rule of the microstructure of rich water hardening body and show the damage and failure mechanism. By analyzing the damage and failure mechanism of the rich-water packing material hardening crystals in the typical mine environment, this project will look for the technical approach of controlling its damage and failure.