(1. 華南理工大學(xué) 土木與交通學(xué)院，廣州 510640；
2. 華南理工大學(xué) 安全科學(xué)與工程研究所，廣州 510640；
3. 廣晟有色金屬股份有限公司，廣州 510640)
摘 要: 相鄰中段礦柱間發(fā)生嚴(yán)重偏離時(shí)，嚴(yán)重影響采空區(qū)頂板安全厚度的取值，危及礦山生產(chǎn)安全。本文以某地下石灰?guī)r礦山采空區(qū)為例，在分析相鄰中段偏離礦柱的頂板受力特征基礎(chǔ)上，構(gòu)建頂板的受力模型，建立安全厚度(hs)的數(shù)學(xué)表達(dá)式，研究hs與礦柱重疊率λ、礦柱寬度a、空區(qū)跨度b之間的關(guān)系。結(jié)果表明：當(dāng)b一定時(shí)，hs隨a的增加而增大，λ在0.8~1.0時(shí)，hs變化較小并趨于定值；hs隨著λ的增加而減小，λ在0.8~1.0時(shí)，hs變化較小并趨于定值；當(dāng)a一定時(shí)，hs隨b的增加而增大，λ在0.8~1.0時(shí)，hs增速變化較小；hs隨著λ的增加而減小，λ在0.8~1.0時(shí)，hs增速較小；礦山礦柱重疊率須控制在0.8以上。實(shí)例1和實(shí)例2驗(yàn)證了理論計(jì)算方法的科學(xué)性。
關(guān)鍵字: 地下石灰?guī)r礦；礦柱重疊率；頂板；安全厚度；采空區(qū)
（1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China;
2. Institute of Safety Science and Engineering, South China University of Technology, Guangzhou 510640, China;
3. Eising Nonferrous Metals Share Co., Ltd., Guangzhou 510640, China）
Abstract:When there is a serious deviation between pillars in the adjacent middle section, it will seriously affect the value of the safe thickness of the goaf roof and endanger the safety of mine production. This article takes an underground limestone mine as an example, based on the analysis of the force characteristics of the roof of the adjacent middle section deviating from the pillar, the stress model of the roof is established, the mathematical expression of the safe thickness (hs) is established, and the relationships among hs, pillar overlap rate (λ), pillar width (a) and empty area span (b) were studied. The results show that when b is constant, hs increases with the increase of a, and when λ is in the range of 0.8-1.0, hs changes little and tends to be constant. hs decreases with the increase of λ. When λ is in the range of 0.8-1.0, hs changes little and tends to be constant. When a is constant, hs increases with the increase of b, and when λ is in the range of 0.8-1.0, the change of hs growth rate is small. hs decreases with the increase of λ, and when λ is in the range of 0.8-1.0, hs tends to increase slowly. The pillar overlap ratio of the mine shall be controlled above 0.8. Examples 1 and 2 verify the scientificity of the theoretical calculation method.
Key words: underground limestone mine; pillar overlapping ratio; roof; safety thickness; goaf
