沿空留巷隔离墙接顶充材料力学特性研究

发布时间：2018-05-02 16:00

本文选题：粘塑性支座 + 接顶充填　；参考：《西安科技大学》2015年硕士论文

【摘要】：现今沿空留巷隔离墙两种充填模式中刚性充填方式会造成充填体变形不能匹配围岩变形;柔性充填方式不易控制充填体的变形。针对此问题,本文提出了一种新型粘塑性支座隔离墙。这种隔离墙主体结构为高强度以提供较高的支护阻力,顶部支撑接触面为粘塑性胶凝体能达到密封、变形让压保护支护主体。两种充填材料的组合而成的新型隔离墙解决了沿空留巷的矿压耦合适应性和密封性问题。本文通过对巷道围岩变形规律的分析,支护前期巷旁支护体要具备足够的切顶阻力。同时,巷旁充填体在达到极限的承载能力后,其自身要具备一定的可缩量。提出主体采用高强早硬混凝土结构,顶部采用粘塑性材料的粘塑性支座隔离墙。通过“叠加层板”原理进行了巷旁支护阻力的计算,从而确定出顶部材料的要求。采用理论分析、实验室试验、数值模拟等方法对新型粘塑性支座隔离墙进行了研究。根据隔离墙顶部材料的特性需要,分析了各种配比成分对其物理力学性能的影响程度,采用正交设计法优化配比。新型粘塑性接顶材料是在普通混凝土中加入膨润土、粉煤灰和活性添加剂。顶部充填材料可保持长时间流动性,凝结时间满足工程需要。混凝土28d抗压强度可达20.34MPa,弹性模量可降低至1690 MPa。通过MIDAS/GTS软件对接顶充填隔离墙和整体隔离墙巷道周围围岩位移变形、应力分布及塑性区域进行模拟对比,结果表明顶部充填隔离墙具有较好的性能;所以新型隔离墙技术因其早撑早强的特性能够适应巷道顶板变形规律,支护效果显著,因此具有广泛的应用前景。
[Abstract]:In the two filling modes of the wall wall along the goaf, the rigid filling mode will cause the deformation of the filling body not to match the deformation of the surrounding rock, and the flexible filling method is difficult to control the deformation of the filling body. In order to solve this problem, a new viscoplastic support wall is proposed in this paper. The main structure of the wall is high strength to provide high support resistance, the top supporting contact surface is viscoplastic cementing physical ability to seal, and the deformation allows pressure to protect the main body of the support. The new wall formed by the combination of two kinds of filling materials solves the problems of coupling adaptability and sealing of mine pressure along goaf roadway. Based on the analysis of the deformation law of roadway surrounding rock, enough roof cutting resistance is required for the supporting body beside roadway in the early stage of support. At the same time, after reaching the ultimate bearing capacity, the backfill should have a certain amount of shrinkage. The viscoplastic wall with high strength early hardening concrete structure and viscoplastic material at the top of the wall is put forward. Based on the principle of "superposition laminate", the resistance of roadway side support is calculated, and the requirement of top material is determined. The new viscoplastic support wall is studied by theoretical analysis, laboratory test and numerical simulation. According to the characteristics of the material at the top of the wall, the influence of various proportioning components on the physical and mechanical properties of the wall is analyzed, and the orthogonal design method is used to optimize the proportion. The new viscoplastic top joint material is the addition of bentonite, fly ash and active additives in ordinary concrete. Top filling material can maintain long time flow, setting time to meet engineering needs. The compressive strength of concrete can reach 20.34 MPA and the elastic modulus can be reduced to 1690 MPA. The displacement and deformation, stress distribution and plastic region of surrounding rock around the wall wall are simulated and compared by MIDAS/GTS software. The results show that the top filling wall has better performance. Therefore, the new wall technology can adapt to the roof deformation law of roadway because of its characteristics of early supporting and early strength, so it has a wide application prospect.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD322.4;TD353

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