摘要
基于不同级配矸石充填体压实特性试验,推导出充填体弹性模量和轴向应变之间的关系,利用有限差分软件FLAC 3D内置的FISH语言编制相应的充填体非线性压实程序,模拟出不同级配充填体内部压实规律和采空区上覆岩层移动规律。结果表明:随着矸石级配(Talbot指数n)的增大,矸石粒径区间内大颗粒分布增多,充填体内部初始孔隙度增大,上覆岩层下沉量增加。当选取Talbot指数n=0.2的矸石进行充填时,充填体与预留保护煤柱构成的二元承载体结构最稳定,能够取得最佳减沉效果。
Based on the test of compaction characteristics of differently graded vermiculite material,the relationship between the elastic modulus and axial strain of the filling body is deduced,and the corresponding non-linear compaction program of the filling body is compiled using the finite difference software FLAC 3D built-in FISH language,which accurately simulates the internal compaction law of different graded filling bodies and the movement law of overlying rock strata in the mined-out area.The results show that with the increase of the vermiculite gradation(Talbot index n),the distribution of large particles in the vermiculite particle size range increases,the initial porosity in the filling body increases,and the subsidence of the overburden layer increases.When the vermiculite with Talbot index n=0.2 is selected for filling,the binary carrier structure composed of the filling body and the reserved protective coal pillars is the most stable and can achieve the best anti-sinking effect.
作者
王逸鸣
马杰
戴洪宝
WANG Yi-ming;MA Jie;DAI Hong-bao(Suzhou University,Suzhou 234000 China)
出处
《新余学院学报》
2020年第6期40-45,共6页
Journal of Xinyu University
基金
国家自然科学基金项目“矸石胶结充填材料的宏细观力学特性及骨料粒径优化调控”(52004272)
安徽省教育厅科学研究重点项目“煤矿区地下水水化学对采矿扰动的响应及其影响机理研究”(KJ2019A0677)。
