摘要
基于弹性地基梁解析方法,考虑影响长壁充填开采地表沉陷的3个关键因素,建立该条件下的力学模型,推导直接顶岩梁挠曲微分方程。根据其解析解,分析了覆岩移动的各影响因素,充填区和煤体内支承压力分布、顶板剪力等矿压显现规律,并分析了直接顶挠曲和地表下沉的关系。结果表明:直接顶岩梁的最大下沉值在采煤工作面后方5～15 m,充填体弹性地基系数是影响下沉的最重要因素,充填区支承压力的分布也随该系数的不同而变化;控制直接顶挠曲和地表下沉的最有效途径为提高充填体弹性地基系数,同时减少充填体欠接顶量。小屯矿膏体充填工业试验表明,地表最大下沉实测值为380.3 mm,解析法预测值为401.8～591.2 mm,两者很接近。
Based on the analytic method of beams on elastic foundation, the three principle factors were considered to build mechanical model on the condition of long-wall mining with backfilling, with which basic differential equations of de-flections were obtained. All factors affecting movement of overlying strata, the distribution of the front and rear abutment pressure were analyzed through the solutions from these differential equations. The result shows that maximum deflection of immediate roof is 5 ~ 15 m at the rear of the mining face, the coefficient of elastic foundation is the most important factor af- fecting subsidence in gob, and the distribution of abutment pressure in gob also depends on the coefficient of elastic founda- tion. The most effective approaches to control and deflection of immediate roof and surface subsidence are to increase the value of coefficient of foundation and decrease the value of the gap between immediate roof and backfill. Field experiment at Xiaotun colliery also shows that the in situ value of maximum subsidence is 380. 3 mm,which is very close to the predicted value 401.8-591.2 mm with the analytic method.
出处
《金属矿山》
CAS
北大核心
2013年第1期1-6,共6页
Metal Mine
基金
中央高校基本科研业务费专项(编号:2010YZ03)
关键词
解析方法
弹性地基梁
膏体充填
地表下沉
Analytic method, Beams on elastic foundation,Paste-backfilling, Surface subsidence
