Combined with a digital bored photography system and in-situ statistics concerning the joints and fissures of both ore-body and surrounding rock,a 2D discrete model was constructed using UDEC.The stress field and disp...Combined with a digital bored photography system and in-situ statistics concerning the joints and fissures of both ore-body and surrounding rock,a 2D discrete model was constructed using UDEC.The stress field and displacement field changes of different sublevel stoping systems were also studied.Changes in the overlying rock strata settlement pattern has been analyzed and validated by in-situ monitoring data.The results show that:in the caving process,there exists an obvious delay and jump for the overlying rock strata displacement over time,and a stable arch can be formed in the process of caving,which leads to hidden goafs.Disturbed by the mining activity,a stress increase occurred in both the hanging wall and the foot wall,demonstrating a hump-shaped distribution pattern.From the comparison between simulation results and in-situ monitoring results,land subsidence shows a slow-development,suddenfailure,slow-development cycle pattern,which leads eventually to a stable state.This pattern validates the existence of balanced arch and hidden goafs.展开更多
Since the beginning of human civilization, the existence of a variety of production and life, etiquette and other social customs are obvious. The invention of photography is natural firstly used to the performance of ...Since the beginning of human civilization, the existence of a variety of production and life, etiquette and other social customs are obvious. The invention of photography is natural firstly used to the performance of various phenomena of human existence. Not until 1993 did Folk photography was formally proposed and was quickly accepted by the public. Folk photographer should have a certain amount of theoretical knowledge of folklore, ethnology, anthropology, and folklore should familiar with the laws of photography. Folk photographer should not only be able to skillfully use a variety of photographic techniques to create photographer, but also have the ability of folklore studies, which means a certain level of theory and master certain research methods. Folk photography creative process is a cultural experience and explores the process of discovery. Folk photography is methods and means to record, release and heritage attending profound traditional Chinese culture. Folk photography through a unique form of expression, with its visual image, embodies the academic value of folk history, the development of human history, cultural heritage and makes a positive contribution to the spread. In the 21st century, China＇ s social stable, economic development rapidly, which provide a good folk photography authoring environment. Folk photography range will also change with the development of folk and continuously expanding, concerns and reflections about the new folk themes have yet to be excavated, to meet the needs of social development.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51374033)the Doctoral Program of Higher Education Research Fund(No.20120006110022)the Chenchao Iron Mine and the technical support of Itasca
文摘Combined with a digital bored photography system and in-situ statistics concerning the joints and fissures of both ore-body and surrounding rock,a 2D discrete model was constructed using UDEC.The stress field and displacement field changes of different sublevel stoping systems were also studied.Changes in the overlying rock strata settlement pattern has been analyzed and validated by in-situ monitoring data.The results show that:in the caving process,there exists an obvious delay and jump for the overlying rock strata displacement over time,and a stable arch can be formed in the process of caving,which leads to hidden goafs.Disturbed by the mining activity,a stress increase occurred in both the hanging wall and the foot wall,demonstrating a hump-shaped distribution pattern.From the comparison between simulation results and in-situ monitoring results,land subsidence shows a slow-development,suddenfailure,slow-development cycle pattern,which leads eventually to a stable state.This pattern validates the existence of balanced arch and hidden goafs.
文摘Since the beginning of human civilization, the existence of a variety of production and life, etiquette and other social customs are obvious. The invention of photography is natural firstly used to the performance of various phenomena of human existence. Not until 1993 did Folk photography was formally proposed and was quickly accepted by the public. Folk photographer should have a certain amount of theoretical knowledge of folklore, ethnology, anthropology, and folklore should familiar with the laws of photography. Folk photographer should not only be able to skillfully use a variety of photographic techniques to create photographer, but also have the ability of folklore studies, which means a certain level of theory and master certain research methods. Folk photography creative process is a cultural experience and explores the process of discovery. Folk photography is methods and means to record, release and heritage attending profound traditional Chinese culture. Folk photography through a unique form of expression, with its visual image, embodies the academic value of folk history, the development of human history, cultural heritage and makes a positive contribution to the spread. In the 21st century, China＇ s social stable, economic development rapidly, which provide a good folk photography authoring environment. Folk photography range will also change with the development of folk and continuously expanding, concerns and reflections about the new folk themes have yet to be excavated, to meet the needs of social development.
