摘要:
为解决采动动压影响下煤层上山巷道围岩破碎严重、变形大等支护难题,采用现场调查、理论分析及数值计算相结合的方法,分析得出了在采动支承压力作用会使煤层上山巷道围岩岩性变差,破碎区和塑性区范围增大,致使围岩发生强烈剪胀变形的矿压显现特征,从提高围岩强度、支护阻力和支护承载结构的稳定性3方面研究了此类巷道围岩控制机理,提出了U型钢支架基本支护+锚索结构补偿的新型支护技术,应用结果表明:对前修后扩的煤层上山巷道两帮最大位移量仅160 mm,顶底板最大位移量180 mm,表明了提高围岩强度、支护阻力和支护承载结构的稳定性可以有效地控制此类巷道围岩强烈变形。
关键词:
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动压
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煤巷上山
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支承压力
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围岩变形
Abstract:
In order to solve the surrounding rock broken seriously, high deformation and other support problems in the seam upward gateway under the influences of the dynamic pressure, the site investigation, the theoretical analysis and numerical calculation combined method was applied and the analysis result showed that the mining dynamic support pressure role would make the surrounding rock lithology of the seam upward gateway getting worse, would make the broken zone and plastic Z one scope increased, would cause the surrounding rock to occur the mine pressure behaviors features of serious shear deformation.To improve the strength of the surr ounding rock, the support resistance and the support loading structure stability, the surrounding rock control mechanism of the gateway was studied.A new support tech nology with U type steel support basic support+ anchor structure compensation was provided.The application results showed max convergence between the two sidewall s of the seam upward gateway with the front repair and rear expansion was only 160 mm and the max convergence between the roof and floor was about 180 mm.The r esults showed that improving the strength of the surrounding rock, the support resistance and the support loading structure stability could effectively control the serious deformation of the surrounding rock in the such gateway.
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