小康井田煤系地质构造

Geological structure of coal measures in Xiaokang mining area

应用构造地质学原理和方法,阐述了小康井田3组褶皱、5组断层的发育特征和分布规律;从区域构造背景、构造应力场演化揭示了该井田地质构造的形成期次,即先后形成了压性结构面(以褶皱轴面、逆断层面为代表)走向呈北西西、北东东、北北西向的构造系统;分析了后期构造形迹迁就和改造先存构造形迹的力学性质转化,其中,由于断层多期活动的综合效应和构造抬升、应力松弛使绝大部分断层现今表现为正断层;指出走向为北北东向同沉积正断层对原始煤层的发育具有控制作用,其他方向的断层尤其是北北西向或近南北向的断层,主要表现为成煤后对煤层的破坏作用。

The paper introduces the application of the principle and method of structural geology to deal with the characters of growth and regularities of distribution of three groups of folds and five groups of faults in Xiaokang mining area. Geological structural generation is opened out fi＋om background of regional structure and evolvement of tectonic stress field, viz. strike of compressive structural plane （axial surface of fold and reverse fauh surface as the representation） are NWW, NEE, NNW as a structural system successively. The paper presents the analysis of transformation of mechanical properly related to indulging the succeeding structural features and creating pre-exist structural features. The analysis shows that the occurrence most of faults as normal ones is attributed to the combined effect of polyphase fauh activity, structural uplift and relaxation of stress nowadays. Strike of synsedimentary normal faults is due to the fact that NNE controls the growth of original coal beds and strike of faults is due to that fact that other directions （NNW or near SN in chief） destroys coal beds after coal forming.