工程科学学报2016，Vol.38Issue(5)：602-608,7.DOI:10.13374/j.issn2095-9389.2016.05.002
富水充填材料蠕变及其硬化体内水分损失特征
Creep and water loss characteristics in hardening bodies of water-rich filling materials
摘要
Abstract
In order to investigate the characteristics of deformation and water loss of hardened paste of water-rich filling material under aging effect, the creep property of water-rich filling materials with a certain mass ratio of water to solid was studied in different stress conditions. The deformation characteristics, water loss and its relationship with external load on the filling body in the process of creep were analyzed by using scanning electron microscopy and differential thermal analysis- thermal gravimetry ( DTA- TG ) . It is found that the instability and failure critical stress of water-rich filling materials with a 2. 0 water-to-solid mass ratio is 1. 96 MPa, which is 90% of their compressive strength. Creep cannot affect the content of combined water in water-rich filling materials. But un-bound water in water-rich filling materials can run off when instability and failure happen. The relative loss value of unbound water content is of linear positive correlation with the external load level. The loss of unbound water can induce more interspaces in water-rich filling materials. These cracks are quickly pressed and the hardening body produces large deformation under the external load, which leads to the local instability of the filling body and thus affects the overall stability of the goaf.关键词
采矿/充填材料/蠕变特征/硬化/水分损失Key words
mining/filling materials/creep characteristics/hardening/water loss分类
矿业与冶金引用本文复制引用
刘娟红,周茜,赵向辉..富水充填材料蠕变及其硬化体内水分损失特征[J].工程科学学报,2016,38(5):602-608,7.基金项目
国家自然科学基金资助项目(51374036) （51374036）
