(1. 华南理工大学 土木与交通学院，广州 510640；
2. 华南理工大学 安全科学与工程研究所，广州 510640；
3. 广晟有色金属股份有限公司，广州 510640)
摘 要: 相邻中段矿柱间发生严重偏离时，严重影响采空区顶板安全厚度的取值，危及矿山生产安全。本文以某地下石灰岩矿山采空区为例，在分析相邻中段偏离矿柱的顶板受力特征基础上，构建顶板的受力模型，建立安全厚度(hs)的数学表达式，研究hs与矿柱重叠率λ、矿柱宽度a、空区跨度b之间的关系。结果表明：当b一定时，hs随a的增加而增大，λ在0.8~1.0时，hs变化较小并趋于定值；hs随着λ的增加而减小，λ在0.8~1.0时，hs变化较小并趋于定值；当a一定时，hs随b的增加而增大，λ在0.8~1.0时，hs增速变化较小；hs随着λ的增加而减小，λ在0.8~1.0时，hs增速较小；矿山矿柱重叠率须控制在0.8以上。实例1和实例2验证了理论计算方法的科学性。
关键字: 地下石灰岩矿；矿柱重叠率；顶板；安全厚度；采空区
（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
