Measure technology for loose circle and its application.

Based on the 88,302 working face of Baode coal mine, in order to provide the basis for the auxiliary roadway maintenance of the working face, this paper introduces the test principle, test method, test process and result analysis of the loose circle. The analysis shows that the loose range of the two ribs of the auxiliary haulage roadway in 88,302 working face increases gradually with the reduction of the distance from the working face. Affected by mining, the maximum loosening range of roadway coal pillar side is 2.4 m, and the maximum loosening range of coal wall side is 2.2 m. It provides the basis for determining the reasonable bolt support parameters, and provides the practice for the loose circle test of the roadway under similar conditions. [ABSTRACT FROM AUTHOR]