摘要
通过对煤体蠕变特性的分析,提出采用五元粘弹塑流变模型能很好地描述煤体的蠕变特征。在考虑煤层瓦斯的作用下,得到了含瓦斯的煤蠕变状态方程。由于揭开的煤层裸露面由原来的三向受力变为二向受力,在合适的条件下煤体会产生蠕变。而煤体在双向受压时,裸露面方向的应变为拉应变,当裸露面方向的煤体的拉应变大于煤体破坏时的拉应变时,煤体将产生蠕变失稳。从而可以预测煤体蠕变失稳的时间。研究成果可以解释揭煤工程岩体失稳。
Through the analysis of coal creeping feature, the paper proved that quintic rheological model with adhesiveness, elasticity and plasticity functions well in describing the creeping. On consideration of the coal gas, it was figured out the state law of the creeping of coal with gas. It is found that creeping occurs to coal in certain situation because the stress on uncovering coal plane has changed from three-dimensional stress to two-dimensional stress. If coal is two-way stressed, the strain on the direction of uncovering plane is tension strain; and if this tension strain of the coal on the uncovering plane excesses that level of coal breaking up, the creep collapsing happens. With this method, it can be predicted the time of creep collapsing on uncovering coal plane. The method can also explain the mechanics of rock collapsing in engineering.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2005年第6期841-844,共4页
Rock and Soil Mechanics
基金
国家自然科学基金重点资助项目(50334060)
重庆市院士基金资助项目(6592)
