The blasting experiment of the cement mortar model reveals that joint inclination affects blasted rock size distribution, which is an important index to evaluate the blasting effect. According to the fractal theory, t...The blasting experiment of the cement mortar model reveals that joint inclination affects blasted rock size distribution, which is an important index to evaluate the blasting effect. According to the fractal theory, the relationship is built up between fractal dimension and mass fraction of blasted fragments screened, that is, y x=100(x/x m ) 3-D . On the basis of the experiment results, the fractal dimension describing fragment size distribution is calculated.展开更多
以乌鲁木齐1号线穿越急倾斜煤层采空区为原型,借助物理相似试验引入分形理论开展荷载下采空区覆岩动态演化规律及其质量评价研究。结果表明:随着采场推进,覆岩最大应力增加且伴随升维现象;利用双重分形定量描述覆岩裂隙状态变化,荷载0.2...以乌鲁木齐1号线穿越急倾斜煤层采空区为原型,借助物理相似试验引入分形理论开展荷载下采空区覆岩动态演化规律及其质量评价研究。结果表明:随着采场推进,覆岩最大应力增加且伴随升维现象;利用双重分形定量描述覆岩裂隙状态变化,荷载0.20~0.35 MPa时产生新裂隙,且原有裂隙会闭合;裂隙条数分形维数与地表最大下沉量及侧壁围岩最大离层量呈非线性相关,荷载0.20 MPa时均有较大跳跃,变化趋势一致;建立基于岩体完整性系数和岩体损伤程度的岩体质量评价方法,对采动和地铁荷载工况下覆岩岩体质量进行评价,发现RMR(Rock Mass Rating)值随分维数增大呈线性递减趋势,并量化表征了岩体力学参数和岩体质量的弱化程度。研究结果可为穿越采空区的路基稳定性评价提供科学依据。展开更多
文摘The blasting experiment of the cement mortar model reveals that joint inclination affects blasted rock size distribution, which is an important index to evaluate the blasting effect. According to the fractal theory, the relationship is built up between fractal dimension and mass fraction of blasted fragments screened, that is, y x=100(x/x m ) 3-D . On the basis of the experiment results, the fractal dimension describing fragment size distribution is calculated.
文摘以乌鲁木齐1号线穿越急倾斜煤层采空区为原型,借助物理相似试验引入分形理论开展荷载下采空区覆岩动态演化规律及其质量评价研究。结果表明:随着采场推进,覆岩最大应力增加且伴随升维现象;利用双重分形定量描述覆岩裂隙状态变化,荷载0.20~0.35 MPa时产生新裂隙,且原有裂隙会闭合;裂隙条数分形维数与地表最大下沉量及侧壁围岩最大离层量呈非线性相关,荷载0.20 MPa时均有较大跳跃,变化趋势一致;建立基于岩体完整性系数和岩体损伤程度的岩体质量评价方法,对采动和地铁荷载工况下覆岩岩体质量进行评价,发现RMR(Rock Mass Rating)值随分维数增大呈线性递减趋势,并量化表征了岩体力学参数和岩体质量的弱化程度。研究结果可为穿越采空区的路基稳定性评价提供科学依据。
