摘要
为了探究含断层磷矿体顶板的稳定性,以贵州某矿为工程背景,基于FLAC3D数值模拟,通过构建含断层磷矿体力学模型推导了含断层磷矿体顶板最大下沉量公式,并使用数学分析方法优选出拟合效果最佳的下沉量公式相关系数为a=3.4823、b=0.6023,最后结合现场工程试验验证含断层磷矿体顶板最大下沉量公式的准确性。数值模拟结果显示,三个矿房的顶板最大下沉量分别为25、14、10 mm;公式计算结果显示,三个矿房采空区顶板最大下沉量分别为25 21、15 43、10 67 mm,公式计算结果与数值模拟结果高度一致,且与现场实测结果误差范围在±2 mm内,验证了公式的准确性。研究表明:断层的存在会使得磷矿体采空区上覆岩层的下沉量增大,其最大下沉量与矿房到断层的铅锤距离呈现负相关,越靠近断层的矿房,直接顶下沉量越高。
To explore the stability of the roof of fault-bearing phosphate rock,based on the FLAC3D numerical simulation of a mine in Guizhou Province,the maximum subsidence formula of the roof of fault-bearing phosphate rock was derived by constructing a physical model of fault-bearing phosphate rock.The correlation coefficients of the subsidence formula with the best fitting effect were a=3.4823 and b=0.6023 by mathematical analysis method.At last,the accuracy of the maximum subsidence formula of the roof of the rock containing a fault was verified by a field engineering test.The numerical simulation results show that the maximum roof subsidence of the three mining houses is 25 mm,14 mm and 10 mm,respectively.The calculation results of the formula show that the maximum subsidence of the goaf roof of the three mine houses is 25.21 mm,15.43 mm and 10.67 mm,respectively.The calculation results of the formula are highly consistent with the numerical simulation results,and the error range of the field measured results is within±2 mm,which verifies the accuracy of the formula.The research shows that the subsidence of overlying strata in the goaf of phosphate rock will increase due to the existence of faults,and the maximum subsidence is negatively correlated with the plumb distance from the mine house to the fault.The closer the mine house is to the fault,the higher the subsidence of the direct roof will be.
作者
周琳
江成玉
王沉
夏勋鹏
梁正伟
龙在云
ZHOU Lin;JIANG Chengyu;WANG Chen;XIA Xunpeng;LIANG Zhengwei;LONG Zaiyun(School of Mining,Guizhou University,Guiyang 550025,China;Bureau of Industry,Science and Technology,Xingren City,Xingren 562300,China)
出处
《有色金属(中英文)》
北大核心
2025年第8期1421-1429,共9页
Nonferrous Metals
基金
国家自然科学基金资助项目(52174072,52364010)。
关键词
断层
磷矿体
顶板稳定性
力学模型
数值模拟
fault
phosphate ore body
roof stability
mechanical modeling
numerical simulation
