摘要
将收敛-约束法应用于煤矿竖井支护结构稳定性分析当中,通过现场勘察与数值模拟手段,采用Hoek-Brown准则计算得出竖井围岩特征曲线与纵剖面变形曲线,结合现场采用的支护结构参数,绘制出支护结构特征曲线,分析围岩-支护相互作用关系,揭示该竖井支护结构破坏机理。引入高强预应力锚索进行高阻让压的思想,通过建立三维数值模型计算出围岩-支护相互作用关系曲线,确定合理的围岩位移释放量,指导混凝土二次支护时机。研究结果表明:Hoek-Brown模型计算结果与现场实际情况相符,收敛-约束法能够直观地评价支护系统的稳定性,提出的设计方案在现场实际应用中取得了理想的效果。
The Convergence-Constraint method was applicated to the stability analysis of shaft supporting structure in Coal Mine. Through the investigation and numerical simulation method, it was calculated the ground reaction curves and longitudinal deformation profile by Hoek-Brown criterion. Combined with the parameters of supporting structural, drawing the support characteristic curves, analysis of the interaction in surrounding rock and supporting structure, the failure mechanism of supporting structure in the shaft was revealed. Introducing the idea of high strength prestressed anchor for high resistance before pressure allowing, through the establishment of three-dimensional numerical model to calculate the interaction curves in surrounding rock and support structure, a reasonable release amount of rock displacement was determined to guide the secondary support retaining of time. The results show that the results of Hoek- Brown model is in consistent with the actual situation, Convergence-Constraint method can more intuitively evaluate support system stability. The proposed design in the actual application achieved the desired effect.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2013年第4期587-594,共8页
Journal of China Coal Society
基金
国家自然科学基金联合资助项目(51174268)
关键词
竖井
支护系统
收敛-约束法
HOEK-BROWN准则
高阻让压
vertical shaft
supporting system
Convergence-Constraint method
Hoek-Brown criterion
high resistance before pressure allowing
