中文摘要：

根据河南胡襄煤田勘探钻孔资料，对煤层的稳定性和煤厚度变化特征进行研究。研究认为，区内二。煤层可采性指数为0．81，厚度变异系数为39％，属较稳定的全区大部可采的中厚一厚煤层；二：煤层可采性指数为1，厚度变异系数为11％，属稳定的全区可采的中厚一厚煤层；区内煤层厚度呈现东部厚西部薄的分布特征，局部出现无煤带或薄煤带；影响煤厚变化的因素主要为成煤时期地壳的不均匀沉降、成煤后期的古河流冲刷与断裂构造破坏作用。

英文摘要：

According to the coal thickness data from the exploration drilling in Huxiang coalfield, Henan prov- ince, the stability and the change characteristics of thickness of coal seam are discussed. The research shows that the workability index is O. 81 and thickness differentiation coefficient 39% for No. 111 coal seam, and thus the coal seam is classified to relatively stable and most recoverable one in the whole area. For No. II 2 coal seam, its workability index is 1 and thickness differentiation coefficient 11% , and it belongs to medium-thick- ness or thickness coal seam. The coal seam is stable and recoverable in the whole area. The thickness of coal seams in the area shows that the distribution characteristic is thicker in eastern part and thinner in western, and that no coal and thin coal zones appear in the local part. The main controlling factors affecting the varia- tion of coal seam thickness are the differential settlement of the crust in coal-forming periods, erosion by ancient river, and fracture and tectonic destructive effects after coal formation.