摘要
以某煤矿2307充填开采工作面为原型,采用相似模拟与数值模拟相结合的方法,建立地质力学模型,模拟分析了开采充填过程中围岩、地表的力学演化规律和移动变形过程。研究表明：充填开采可有效控制覆岩破坏和地表变形,顶板出现离层裂隙,但未垮落,最大下沉滞后工作面约58．5m；开采过程中围岩应力释放,顶板出现拉伸,采空区前后端及底板出现应力集中,为开采前的1．47-1．78倍,充填工作面周期来压不明显；开挖后地面下沉值为212．7mm,下沉系数为0．06,地面水平变形和倾斜变形形态与垮落法管理顶板曲线形态相似,量值较小。
Applying analogue simulation and numerical simulation, the mechanics variation and movement and deformation in stowing mining 2307 face was analyzed. Results showed that stowing mining could effectively control overlying strata failure and surface deforma-tion, and that separation and fissure occurred but roof was not cave. Maximum subsidence was 58. 5m behind of mining face. In min-ing, surrounding rock stress releasing made roof tensed. Stress concentration occurred at front and rear of gob, and floor which reached 1. 47-1. 78 times of original stress. Periodical weighting was inconspicuous. Surface subsidence value was 212. 7mm after mining and subsidence ratio was 0. 06. Surface horizontal deformation and tilt deformation curve was similar with that of roof-caving method, but deformation value was small.
出处
《煤矿开采》
北大核心
2015年第5期57-61,共5页
Coal Mining Technology
基金
天地科技股份有限公司资助项目:充填开采充填率及合理充采步距与控制地表变形的研究(KJ-2013-TDKC-12)
关键词
充填开采
模拟实验
数值计算
围岩应力
地表移动
stowing mining
simulation experiment
numerical simulation
surrounding rock stress
surface movement
