Through analysis to weak coalbed and harmfulness to roadway, main haulage roadway and room supporting design and adaptability condition are discussed in weak coalbed.

This paper introduces controlled blasting technology on signal chamber of pit-bottom and main haulage roadway, which are of complex condition, lithological character and highly security.

The main factor causing destruction of roadway in tectonic stress field is found to be the high tensile strain, which appears after the coal seam above haulage roadway is mined.