Based on the natural characters of stratum, complicated geological mining conditions and the essence of mining rock mass destruction, the complexity of rock mass destruction caused by miningw as analyzed. The inner li...Based on the natural characters of stratum, complicated geological mining conditions and the essence of mining rock mass destruction, the complexity of rock mass destruction caused by miningw as analyzed. The inner link between rock mass destruction phenomena caused by mining and nonlinear science was revealed. There are numerous cracks in natural rock mass. The cracks’ distribution is irregular and is of statistical fractal structure. Self-organizational nonlinear evolution of the inner structure flaws leads to the rock mass destruction with external force. The evolution includes single fault’s fractal development, formation and evolution of fractal crack network and coordination of fractal crack network, etc. The law of fractal crack network’s evolution was introduced, at the same time, the coordination of fractal crack network was analyzed. Finally, based on coordination the principal equation of mining-caused subsidence of structural rock mass was established and its steady-state solution and unsteady-state solution were found.展开更多
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
The geological strength index(GSI) system,widely used for the design and practice of mining process,is a unique rock mass classification system related to the rock mass strength and deformation parameters based on the...The geological strength index(GSI) system,widely used for the design and practice of mining process,is a unique rock mass classification system related to the rock mass strength and deformation parameters based on the generalized Hoek-Brown and Mohr-Coulomb failure criteria.The GSI can be estimated using standard chart and field observations of rock mass blockiness and discontinuity surface conditions.The GSI value gives a numerical representation of the overall geotechnical quality of the rock mass.In this study,we propose a method to determine the GSI quantitatively using photographic images of in situ jointed rock mass with image processing technology,fractal theory and artificial neural network(ANN).We employ the GSI system to characterize the jointed rock mass around the working in a coal mine.The relative error between the proposed value and the given value in the GSI chart is less than 3.6%.展开更多
This paper presents a method using stochastic algorithm for inter-polation of natural phenomena. The method is based on general concepts ofMarkov chain , ergodic theory and center of mass. An advantage of this algo-ri...This paper presents a method using stochastic algorithm for inter-polation of natural phenomena. The method is based on general concepts ofMarkov chain , ergodic theory and center of mass. An advantage of this algo-rithm is that it combines with the scan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
基金Foundatinitem Project(50274044) supported by the National Natural Science Foundation of China .
文摘Based on the natural characters of stratum, complicated geological mining conditions and the essence of mining rock mass destruction, the complexity of rock mass destruction caused by miningw as analyzed. The inner link between rock mass destruction phenomena caused by mining and nonlinear science was revealed. There are numerous cracks in natural rock mass. The cracks’ distribution is irregular and is of statistical fractal structure. Self-organizational nonlinear evolution of the inner structure flaws leads to the rock mass destruction with external force. The evolution includes single fault’s fractal development, formation and evolution of fractal crack network and coordination of fractal crack network, etc. The law of fractal crack network’s evolution was introduced, at the same time, the coordination of fractal crack network was analyzed. Finally, based on coordination the principal equation of mining-caused subsidence of structural rock mass was established and its steady-state solution and unsteady-state solution were found.
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The geological strength index(GSI) system,widely used for the design and practice of mining process,is a unique rock mass classification system related to the rock mass strength and deformation parameters based on the generalized Hoek-Brown and Mohr-Coulomb failure criteria.The GSI can be estimated using standard chart and field observations of rock mass blockiness and discontinuity surface conditions.The GSI value gives a numerical representation of the overall geotechnical quality of the rock mass.In this study,we propose a method to determine the GSI quantitatively using photographic images of in situ jointed rock mass with image processing technology,fractal theory and artificial neural network(ANN).We employ the GSI system to characterize the jointed rock mass around the working in a coal mine.The relative error between the proposed value and the given value in the GSI chart is less than 3.6%.
文摘This paper presents a method using stochastic algorithm for inter-polation of natural phenomena. The method is based on general concepts ofMarkov chain , ergodic theory and center of mass. An advantage of this algo-rithm is that it combines with the scan
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。
