弱粘结遇水软化围岩煤巷控制技术研究

发布时间：2019-07-02 15:17

【摘要】：本文以内蒙古泊江海子煤矿113101工作面辅运顺槽为工程背景,基于软岩工程相关理论、数值模拟研究和现场实践对比分析,对弱粘结遇水软化煤巷围岩进行破坏机理分析,提出优化支护方案。通过分析弱粘结遇水软化煤巷支护机理,建立巷道顶板力学简化模型,计算得出,弱粘结遇水软化顶板各分层中遇水软化岩层遇水后弹性模量最小,挠度最大,在承受载荷相同时,含遇水软化岩层最易发生变形及离层,对顶板进行受力分析,最大挠度ωmax位于巷道中间位置,巷道顶板中线位置下沉量最大。对围岩松动圈进行实测得出巷道底角位置松动圈范围最大,这是由于顶板水受重力影响积聚在巷道底角,围岩遇水后产生剪胀变形,同时水对弱粘结遇水软化煤巷围岩具有物理、化学和力学影响。针对弱粘结遇水软化煤巷围岩控制原则与机理的研究提出了优化支护方案,通过FLAC模拟软件分析对比不同支护参数与断面形状下围岩应力情况与围岩表面位移量,验证优化支护方案的合理性。通过应用于工程实践,收集分析两种支护方案在巷道掘进与工作面回采时,辅运顺槽顶底板与两帮的移近量,并对顶板围岩进行窥视,验证两种方案下顶板变形破坏情况,通过对比分析得出优化支护方案在实践中取得了良好工程效果,为其它相似顶板条件的巷道支护提供了宝贵意见。
[Abstract]:Based on the relevant theory of soft rock engineering, numerical simulation and on-site practice, this paper analyzes the failure mechanism of the surrounding rock of the weak-bonded water-softening coal roadway based on the correlation theory of soft rock engineering, the numerical simulation research and the on-site practice, and puts forward the optimized support scheme. Through the analysis of the support mechanism of the weak bonding water-softening coal roadway, the mechanical simplified model of the tunnel top plate is established, The most likely deformation and leaving layer of the rock formation with the water softening point is the stress analysis of the top plate. The maximum deflection factor max is located in the middle of the tunnel, and the position of the middle line of the top plate of the tunnel is the largest. It is found that the bottom angle of the tunnel is the largest due to the influence of gravity on the bottom of the tunnel due to the influence of the gravity of the roof water on the bottom of the tunnel. Based on the study of the principle and mechanism of the control of the surrounding rock in the weakly bound water-softening coal roadway, the optimal support scheme is put forward, and the rationality of the optimization and support scheme is verified by the FLAC simulation software to analyze the stress of the surrounding rock and the surface displacement of the surrounding rock under the different support parameters and the section shape. Through the application of the engineering practice, the two supporting schemes are collected and analyzed, Through the comparative analysis, it is concluded that the optimized support scheme has achieved good engineering effect in practice, and provides valuable suggestions for roadway support of other similar roof conditions.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353

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