柔模风积砂流体充填材料及输送研究

发布时间：2018-10-30 13:14

【摘要】：由于我国煤炭有30%以上的煤炭埋藏在“三下一上”等开采后不允许产生沉降的地区,同时近年来我国煤炭的开采也带来了许多环境问题,因此如何高效、合理、经济地开采煤炭资源成为社会各界共同关注的焦点。柔模风积砂流体充填开采技术是煤炭开采的一大创新,既能够提高煤炭的采出率又能够保护地下水免受污染,该项技术的应用对煤炭开采具有重大意义。充填采煤具有煤炭资源回收率高,地表沉降率低等优点,该技术在煤炭开采中逐步得到推广应用。本文结合榆阳煤矿的实际情况,以榆阳地区广泛存在的风积砂为主要充填材料,通过对充填材料的各种配合比进行研究,并结合柔模技术,将风积砂变废为宝,实现绿色充填开采。本文系统研究了如下内容:(1)通过对充填骨料风积砂的化学成分、密度、含水率进行试验分析,对风积砂进行筛分试验,对充填用水进行化学成分分析,对3种粉煤灰材料进行化学成分分析、电镜分析,最终选择符合要求的材料作为充填材料。(2)研究分析了灰砂比、粉煤灰含量、质量浓度对充填料浆的强度及流动性的影响,对试验结果进行对比分析,并选择了符合要求的料浆配合比作为充填配合比。(3)将柔模充填技术应用于充填开采,对柔模的强度和泌水率进行了试验研究;详细介绍了柔模充填开采的施工工艺,并分析了其工艺优势。(4)通过对充填管道的输送系统进行分析研究,选择了符合要求的输送方式。分析了流体输送的流变模型,计算了充填料浆的临界流速,通过对管壁厚度、管道压力、管路直径的计算,选择了合适的充填管道规格,设计了一套自动化的料浆充填系统。
[Abstract]:Since more than 30% of the coal in our country is buried in areas where subsidence is not allowed after mining such as "three lower and one top", the mining of coal in our country has also brought many environmental problems in recent years, so how to be efficient and reasonable, Economic exploitation of coal resources has become the focus of common concern of all walks of life. The technology of flexible mold wind-sand fluid filling is an innovation in coal mining. It can not only improve the coal recovery rate but also protect groundwater from pollution. The application of this technology is of great significance to coal mining. Filling coal mining has the advantages of high recovery rate of coal resources and low rate of surface subsidence, which has been gradually popularized and applied in coal mining. Based on the actual situation of Yuyang coal mine, the aeolian sand widely existing in Yuyang area is used as the main filling material. Through the study of various mix ratio of filling materials and the flexible die technology, the wind-accumulated sand is turned into a treasure. To realize green filling mining. In this paper, the following contents are systematically studied: (1) the chemical composition, density and moisture content of the aeolian sand filled with aggregate are analyzed, the screening test of the aeolian sand is carried out, and the chemical composition of the filling water is analyzed. Chemical composition analysis and electron microscope analysis of three kinds of fly ash materials are carried out. Finally, the materials that meet the requirements are selected as filling materials. (2) the ratio of fly ash to sand, the content of fly ash, and the content of fly ash are studied and analyzed. The effect of mass concentration on the strength and fluidity of filling slurry is compared and analyzed, and the slurry mixture ratio that meets the requirements is selected as the filling mixture ratio. (3) the flexible die filling technology is applied to fill mining. The strength and bleeding rate of flexible die were studied. The construction technology of flexible formwork filling mining is introduced in detail, and its advantages are analyzed. (4) through the analysis and study of the conveying system of filling pipeline, the transportation mode that meets the requirements is selected. The rheological model of fluid transportation is analyzed and the critical velocity of filling slurry is calculated. Through the calculation of pipe wall thickness, pipe pressure and pipe diameter, a set of automatic slurry filling system is designed.
【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】：TD823.7

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