There is a large number of unbound water in rich-water packing material hardening body.The stability conditions of filling body will be changed during the mining disturbance and variable load.This paper analyzed the microstructure characteristic of the hardening body by SEM.Studied the stressstrain characteristics during loading by stress-strain test.By creep experiment analyzed the characteristics of the deformation and the strain of filling body changing over the time during the creep process.As a result, ettringite is the main hydration product of rich-water filling material.The rich-water filling material of water-solid ratio is 2∶1 can maintain elastic deformation in a long period of time when it is subjected to external force.It no brittle destruction immediately when the load is maximum.Creep process includes two stages when once load reach 80％ of filling body uniaxial compressive strength.Decay stage, stable stage and no acceleration stage.It can make sure the long-term stable of filling body.
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