摘要
应用初始后屈曲理论和尖点突变模型探讨了顶板岩层分岔失稳的机理及其屈曲后的不稳定性,得出了采场老顶初次来压时断裂下沉的计算公式,建立了顶板破断后台阶下沉的判据,给出了台阶下沉量。研究发现,顶板破断后岩块处于非平衡状态;台阶下沉是由单一岩块逆向回转引起的;台阶下沉与断裂下沉之间存在着确定的关系。研究结果表明,综合应用初始后屈曲理论和突变理论,可根据浅埋煤层顶板结构的结构特征、岩体材料以及上覆厚松散沙层等赋存状况确定长壁开采工作面初次来压期间基岩老顶可能出现的灾害形式。
Using the initial post-buckling theory and the cusp catastrophic model, the bifurcation buckling mechanism and unstability of roof strata were studied to derive the formulae of the main roof breaking convergence during the first weighting, to build the criterion of step convergence after the main roof breaking and to determine the final step convergence value. It was pointed out that rock blocks were in a non-equilibrium state after the main roof breaking, and the step convergence was caused by the reverse rotation of single rock block and was determinately related with the breaking convergence. It was also indicated that in accordance with the occurrence behavior of roof structure, rock mass materials and thick unconsolidated layers above the roof, the integrated application of the initial post-buckling theory and the catastrophe theory could be employed to determinate catastrophic forms of the main roof structure during the first weighting.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2007年第12期1763-1766,共4页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金资助项目(40572155)
关键词
采矿工程
浅埋煤层
基岩老顶
初始后屈曲
台阶下沉
结构稳定性
mining engineedng
shallow seam
main roof
initial post-buckling
step convergence
structural stability
作者简介
杨治林（1957-），男，陕西榆林人，教授，主要从事固体力学与结构稳定方面的教学和研究工作。E-mail：yangzlyzl@163．com。
