煤岩层状边坡蠕变破裂数值模拟

Numerical Simulation on the Creep Rupture of Coal Rock Layered Slope

煤岩层状边坡在外力及内部结构共同作用下易造成大规模滑坡。应用最大拉应力理论,建立煤岩蠕变破裂判断准则;并对蠕变裂纹的萌生、扩展和汇聚进行有限元描述。基于FEPG软件编制离层蠕变破裂程序模块,在第一主应力矢量方向的垂直方向上生成裂纹,接下来的裂纹扩展再继续寻找第一主应力的最大值,达到抗拉强度后蠕变开裂,不断循环。以海州露天矿国家矿山公园边坡为研究对象,模拟煤岩离层蠕变破裂;结合现场设立的监测点,实测和模拟结果进行对比相吻合,为煤岩层状边坡支护和防治灾害发生提供了依据。

Under the co-action of external and internal structure,the coal rock layered slope possibly results in the massive landslide.With application of the maximum tensile stress theory,the creep rupture judgment criteria are established and the initiation,expansion and gathering of the creep cracks are described by the finite element.Based on the programmed creep rupture module by FEPG software,cracks are generated at the vertical direction of first principal stress vector,then expended to find the maximum of the first principal stress.When it reached the tensile strength,the creep cracks happened.This process is continuously cycled.Taking the slope of Haizhou National Open-pit Park as a research case,the creep rupture of coal（rock） separate layer is simulated.Combining with the on-site monitoring,the result of real measurement is coincided with that of the simulation,which provides a basis for the coal（rock） slope support and prevention of the disaster.