万年煤矿村庄下条带开采方案优化研究

发布时间：2018-09-11 07:28

【摘要】：作为“三下”采煤的主要措施，条带开采已经被我国各大煤炭集团公司广泛应用，其突出的特点是能够有效减少地表沉陷，保护地表建（构）筑物。缺点是造成滞压在建（构）筑物下的煤炭资源的浪费，影响了煤炭企业的可持续发展，但是，条带开采可以在维持地表处建筑物稳定性符合居住的前提下，再次利用积压浪费的费碳资源，延长矿井的寿命，同时也缓和了工农关系，降低了企业开采生产的成本，，这方面特别对一些开采时间很长的老矿井显得尤为重要，因此，对条带开采参数的优化，在国内已成为一个迫切的课题。本文在研究了万年煤矿的矿井生产条件、地质条件、综合分考虑地表建（构）筑物的因素上，通过分析煤层上覆岩层的岩性以及赋存条件，结合概率积分法的理论，分别应用了下沉系数和采深的关系，以及压力拱的方法确定条带开采的宽度，在条带留宽问题上采用单向应力法和安全系数法来确定条带开采的留宽，对两种方案分别就条带煤柱的稳定性和地表沉降处进行计算，得到最优的方案，最后应用FLAC3D数值模拟计算进行验证，分析地表各处具体的沉降参数，对得出的优化参数进行检验和核准，综合分析计算之后得出最优方案。最后结果表明：优化后的条带煤柱具有足够的支撑强度和稳定性，采出后煤层的上覆岩层不会引起波浪式下沉，且地表引起的移动变形符合地面建筑物《规定》中规定的级采动损害的临街变形值，为企业提高经济效益，延长矿井服务年限提供有效的理论依据和技术经验。
[Abstract]:As the main measure of "Sanxia" coal mining, strip mining has been widely used by major coal groups in our country, the outstanding characteristic of which is that it can effectively reduce the surface subsidence and protect the surface building (construction). The drawback is that the waste of coal resources under the hysteretic pressure under the building (construction) has affected the sustainable development of the coal enterprises. However, the strip mining can maintain the stability of the buildings on the surface in accordance with the living conditions. Once again, using the overstocked waste of waste carbon resources to prolong the life of mines, at the same time easing the relationship between workers and farmers, and reducing the cost of mining and production in enterprises, this is especially important for some old mines that have a very long time to mine, so, The optimization of strip mining parameters has become an urgent issue in China. In this paper, on the basis of studying the coal mine production conditions and geological conditions of Wannian coal mine and synthetically considering the factors of surface construction (construction), the lithology and occurrence conditions of overlying strata on coal seam are analyzed, and the theory of probability integration method is combined. The relationship between subsidence coefficient and mining depth and the method of pressure arch are applied to determine the width of strip mining, and the one-way stress method and safety factor method are used to determine the width of strip mining. The stability and surface subsidence of striped coal pillar are calculated, and the optimal scheme is obtained. Finally, the numerical simulation of FLAC3D is used to verify, and the specific settlement parameters are analyzed. The optimized parameters are checked and approved, and the optimal scheme is obtained after comprehensive analysis and calculation. The results show that the optimized strip pillar has sufficient support strength and stability, and the overlying strata of the coal seam after mining will not cause wave subsidence. And the displacement deformation caused by the ground surface accords with the street deformation value of the grade mining damage stipulated in the ground building, which provides an effective theoretical basis and technical experience for the enterprises to improve the economic efficiency and prolong the service life of the mine.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.6

【共引文献】