Abstract: In order to slow down the fatigue level of coalface drilling workers of Pingdingshan Coal Mining Group, this paper studies the working postures under different borehole layouts and angles in 10 mines. Through CATIA analogue simulation, the fatigue level of each body part under different postures is analyzed. It is shown that under the 26 postures, waist, thigh and ankle are most vulnerable to fatigue. Besides, 3-degree oblique upwardness and 606-mm squatting postures are the most exhausted. The fatigue level may be mitigated effectively by optimizing working postures and equipments, which leads eventually to the decreasing of occupational disease risk and enhancing of work efficiency.

Key words: drilling work, fatigue level, work posture, CATIA