断裂孕育时间随材料的蠕变指数、上覆岩层压力的增大而减小;裂隙扩展时间也随材料的蠕变指数、上覆岩层压力的增大而减小,但随岩石的抗拉强度增大而增加。
Also, the crack extension time decreases with the increase of material creep index and the loading of overlying strata rock while it increases with the increase of tensile strength of roof rock.
结果显示压实度随塑性指数和黏粒含量的增加而减小,同时证明塑性指数和黏粒含量有较好的相关性;
The results showed that degree of compaction reduces as plasticity index and clay content increase, which also prove the relationship between plasticity index and clay content;
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