Locating neutral surface of fold and its application in Laohe syncline of Liupanshui area

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• 作者：Liu Aihua^a ; ^b ; ^{liuaihua0129@163.com} ; Fu Xuehai^a ; ^c ; Gu Hongxing^a ; ^b ; Ji Ming^d ; Chen Li^a ; ^b
• 关键词：neutral surface of fold ; pure bending ; modulus of elasticity ; Laohe syncline ; gas content
• 刊名：Procedia Engineering
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：26
• 期：Complete
• 页码：2319-2325
• 全文大小：408 K

文摘

On the assumption that the rock formations of bending flowage fold is heterogeneous board agglutinated by many isotropic stretch foliums, the paper studied the location of fold neutral surface when the rock formation of fold was under pure buckling only on the basis of elastic thin plate theory, and obtained the location formula of neutral surface of fold with the main parameters of modulus of elasticity, Poisson's ratio, and thickness of each rock formations. Combining Laohe syncline data of Liupanshui coalfield in Guizhou province, the neutral surface of Laohe syncline was located in the fine sandstone of NO.9 coal seam floor of Longtan formation, as far as 966m from the bottom of Maokou formation. The closer coal seam distance from neutral plane, the smaller effect of fold construction on gas occurrence and resulted in less difference between the gas content of coal seam near neutral surface and that of wing of syncline. The research results have certain steering effects on coal bed methane exploitation and preventing coal and gas outburst.