材料期刊网

针对某超大断面竖井超深孔反向爆破掘进,最后破顶平台断面面积大,稳定性难以预测等问题,运用数值模拟软件FLAC3D及其汇编语言,对不同顶板厚度分4组进行模拟研究,同时结合安全系数等指标对应力、位移、塑性区等参数统计分析,并应用传统薄板理论、厚板理论估算法进行对比研究,结合工程实践进行现场验证分析.综合研究表明:顶板厚度＜6m时,顶板拉应力大于极限抗拉强度,位移值大于8.16 mm,塑性区出现贯通,顶板失稳几率大;顶板厚度＞8m时,位移值小,平台整体处于相对稳定状态;薄板理论估算顶板厚度合理值为8.6m,厚板理论估算值为6.7m,与模拟值误差较小,并通过实践验证预测顶板厚度9.6m的合理性和准确性.该研究成果对类似工程有较大的指导意义.

Reverse excavation by super long-hole blasting in vertical shaft with super large section of one mine generates problems such as large sectional area upon getting through and unpredictable stability.To solve those problems,the paper uses FLAC3D and its built-in assembly language to numerically simulate different roof thickness in 4 groups,meanwhile statistically analyzes the parameters of stress,displacement and plastic area according to the indi cators like safety factors,compares the traditional estimation methods of thin plate theory and thick plate theory and carries out field verification based on engineering practice.Comprehensive study shows:when the roof thickness is ＜ 6 m,the tensile stress is beyond the ultimate tensile strength,the displacement is ＞ 8.16 mm and the plastic area incurs penetration suggesting great odds of roof instability;when the roof thickness is ＞ 8 m,the displacement is small and the platform is relatively stable;the thin theory estimates the reasonable value of roof thickness is 8.6 m and the thick theory 6.7 m with small error compared to simulated value.Practice proves the reasonability and accuracy of the pre dicted 9.6 m roof thickness.The research has guidance significance for similar projects.