高水巷旁充填材料单轴压缩变形破坏与能耗特征分析

发布时间：2019-02-26 21:10

【摘要】：高水巷旁充填材料在煤矿沿空留巷工程中得到了广泛应用,水灰比对其力学性质关系密切。首先通过扫描电镜分析了高水材料的微细观形貌,其次通过RMT-301伺服试验机对1.3~2.5∶1等6种水灰比的高水材料试样进行了单轴压缩试验,得到了各水灰比试样的全应力-应变曲线,分析了试样的变形特征、强度及破坏特征、能耗特征随水灰比变化的规律。结果表明,高水材料的微观结构为固、液、气构成的多孔海绵状结构;高水材料的变形特征与岩样相似,也大致可分为压密阶段、线弹性阶段、屈服阶段以及峰后应变软化阶段,弹性模量、割线模量和峰值强度等随水灰比提高多呈指数函数关系下降;随着水灰比增大,试样由脆性破坏逐渐过渡到延性破坏;随着水灰比增大,试样吸收的总应变能与可释放弹性应变能均呈指数函数关系下降,而耗散能变化幅度不大。
[Abstract]:The filling material beside the high water roadway has been widely used in the gob-side retaining roadway of coal mine, and the water-cement ratio is closely related to its mechanical properties. Firstly, the micro-morphology of high-water material was analyzed by scanning electron microscope (SEM). Secondly, the uniaxial compression test was carried out on six kinds of high water-cement ratio samples by RMT-301 servo testing machine, such as 1.3 脳 2.5 / 1 water / cement ratio. The total stress-strain curves of each water-cement ratio sample are obtained, and the deformation characteristics, strength and failure characteristics, and energy consumption characteristics of the samples are analyzed as a function of the water-cement ratio. The results show that the microstructure of high-water material is porous sponge-like structure composed of solid, liquid and gas. The deformation characteristics of high-water materials are similar to those of rock samples, and can also be divided into compaction stage, linear elastic stage, yield stage, post-peak strain softening stage and elastic modulus. The Secant modulus and peak strength decreased exponentially with the increase of water-cement ratio. With the increase of water-cement ratio, the specimen gradually changes from brittle failure to ductile failure, and with the increase of water-cement ratio, the total strain energy absorbed by the specimen decreases exponentially with the release elastic strain energy, but the variation of dissipation energy is not obvious.
【作者单位】：河南理工大学能源科学与工程学院;煤炭安全生产河南省协同创新中心;河南理工大学材料科学与工程学院;
【基金】：国家自然科学基金项目(50908076,51304065,51274088)
【分类号】：TD350.4

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