电阻率和电导率
煤
导电体
材料科学
压力(语言学)
煤矿开采
断裂(地质)
地质学
岩土工程
复合材料
工程类
电气工程
语言学
哲学
废物管理
作者
Peng Chen,Enyuan Wang,Xuexi Chen,Zhentang Liu,Zhonghui Li,Rongxi Shen
标识
DOI:10.1016/j.ijmst.2015.07.013
摘要
The stress, strain as well as resistivity of coal during uniaxial compression process were tested based on self-built real-time testing system of loaded coal resistivity. Furthermore, the coal resistivity regularity and mechanism were analyzed at different stages of complete stress–strain process, which includes the two kinds of coal body with typical conductive characteristics. The results indicate that coal resistivity with different conductive characteristics has different change rules in complete stress–strain process. It is mainly represented at the densification and flexibility phases before dilatation occurs. The variation of resistivity can be divided into two kinds, named down and up. Dilatation of coal samples occurred between 66%σmax and 87%σmax. Because of dilatation, coal resistivity involves sudden change. The overall representation is shifting from reducing into improving or from slow improving into accelerated improving. Thus, coal resistivity always shows an increasing tendency at the plastic stage. After peak stress, coal body enters into failure stage. The expanding and communicating of macro fracture causes further improvement of coal resistivity. The maximum value of resistivity rangeability named λ reached 3.49. Through making real-time monitoring on coal resistivity, variation rules of resistivity can be deemed as precursory information so as to reflect the dilatation and sudden change before coal body reaches buckling failure, which can provide a new technological means for forecasting the dynamic disaster of coal petrography.
科研通智能强力驱动
Strongly Powered by AbleSci AI