Cross observation method of surrounding rock in coal mine

Excuse me, are you asking what is the cross observation method of coal mine surrounding rock? Refers to the method to evaluate the stability and safety of coal mine surrounding rock by measuring the deformation and stress parameters in the up, down, left and right directions of coal mine surrounding rock.

1, four measuring points are arranged between the roof and floor of the coal mine roadway and between the two sides, and marked with spray paint or other obvious tools.

2, every once in a while (usually more than two days), with a tape measure to measure the distance between the points and make records.

3. Summarize and sort out the displacement curve of surrounding rock in coal mine roadway.