Locating neutral surface of fold and its application in Laohe syncline in Liupanshui area
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摘要: 假定弯曲流动褶皱的多层岩层是由多个各向同性的弹性薄层粘合而成的非均匀板，基于弹性薄板理论，研究了褶皱岩层仅受纯弯曲作用时褶皱中和面的位置的确定问题，得出了用各岩层弹性模量、泊松比和岩层厚度表示的褶皱中和面位置公式。结合贵州六盘水煤田涝河向斜，计算了涝河向斜褶皱中和面处于龙潭组9号煤层的底板岩层细砂岩中，距茅口组底部966 m, 煤岩层距离中和面越近，褶皱构造对其瓦斯赋存影响越少，使得该处的瓦斯含量与翼部差值就越小。研究成果对煤层气开发及煤与瓦斯突出防治具有一定的指导作用。Abstract: The paper supposed that the rock formations of bending flowage fold is heterogeneous board agglutinated by many isotropic thin layers.Based on elastic thin plate theory, we have studied the questions about locating neutral surface of fold when the rock formation of fold is under pure buckling only, and obtained the location formula of neutral surface of fold with main parameters of modulus of elasticity, Poisson's ratio, and thickness of each rock formation.Combined with Laohe syncline of Liupanshui coalfield in Guizhou province, the neutral surface of Laohe syncline was located in the fine sandstone of coal seam 9# floor of Longtan Formation, as far as 966m from the bottom of Maokou Formation.The nearer the distance of coal seam to neutral surface was, the less the fold structure influence on gas occurrence was, resulting in less difference between the gas content of coal seam near neutral surface and that of wing of syncline.Our research results have certain steering effects on coal bed methane exploitation and preventing coal and gas outburst.
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Keywords:
- neutral surface of fold /
- pure bending /
- modulus of elasticity /
- Laohe syncline /
- gas content
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