摘要
采用数值计算方法分析井工开采煤矿矿山压力与岩层控制问题时,采空区冒落矸石的加载机理、合理本构模型及输入参数困扰着很多学者,直接影响着数值模型的输出结果。为了解决上述问题,首先研究了工作面回采后直接顶岩块垮落、堆积、密实的过程,提出了冒落矸石在压缩前期应变迅速增加、后期杨氏模量和应力迅速增加的加载机理;同时基于Salamon和Terzaghi采空区理论模型优缺点的分析,指出Salamon模型应用范围更广,并采用有限差分软件FLAC3D里的双屈服本构模型模拟了采空区冒落矸石的特殊加载机理,工程实例分析揭示了所建立的数值计算采空区模型围岩应力分布规律与理论研究结果基本一致,模型合理可靠。
When the numerical modeling method was applied to analyze the mining pressureand surrounding rock control in underground coal mines, lots of scholars were puzzled by someproblems such as the loading mechanism of caving gangues, reasonable constitutive model and in-put parameters, so the output results of the numerical model were directly influenced. In order tosolve these questions, the caving, stacking and compacting processes of immediate roof rock afterworking face mining were researched firstly, then the loading mechanism was put forward whichincluding that the strain in earlier stage of compression, the Young modulus and stress in laterstage of compression increased rapidly. According to the merit and demerit analysis of Salamonand Terzaghi models, applied range of Salamon model was more extensive, and the double-yieldconstitutive model of F1AC 3D was adopted to simulate the special loading mechanism of cavinggangue in the goal. Engineering projects showed that the stress distribution law of surroundingrock calculated by the established numerical model was almost same with the theoretical researchresult, so the model was reasonable and reliable.
出处
《中国煤炭》
北大核心
2015年第2期50-54,共5页
China Coal
基金
江苏省2013年度普通高校研究生科研创新计划项目(CXLX13_952)
