Aiming to get the strata behavior and stability rules of surrounding rock of the main return airway of Yushujing Coal Mine, convergence deformation of two sides and force of U-shaped steel yieldable support and bolt w...Aiming to get the strata behavior and stability rules of surrounding rock of the main return airway of Yushujing Coal Mine, convergence deformation of two sides and force of U-shaped steel yieldable support and bolt were monitored, and deformation of surrounding rock and mechanical characteristics of support structure were timely obtained to guide the informa- tion construction and optimize supporting parameters in water-rich soft rock roadway. The field monitoring results indicate the following. （1） Convergence displacement of rock surface increases with time continuity and shows surrounding rock＇s intense theological behavior. The original support scheme cannot control the large deformation and strongly theological behavior; （2） Without backfilling, the U-shaped steel support begins to bear load after erecting for 4-7 days and increases rapidly in the first 30 days. The U-shaped steel support at the right shoulder and top of roadway bears a larger force and the left side and shoulder bears a smaller force; （3） The stress of bolt increasing over time and at the right shoulder of roadway has larger growth and value. The mechanism of rock deformation and the failure and strata behavior in water-rich soft rock roadway are revealed based on the results of the measured relaxation zone of surrounding rock, measured stresses, and the rock mechanics tests.展开更多
Based on the relationship between water environment system and human society,water environment carrying capacity(WECC)probes into supporting ability of complex water environment system to the human society.Recent year...Based on the relationship between water environment system and human society,water environment carrying capacity(WECC)probes into supporting ability of complex water environment system to the human society.Recent years,due to the shortage of water resources and serious water pollution in several watersheds in China,the research of watershed water environment carrying capacity(WWECC)becomes very important.The conception,connotation and method of representation of WWECC are discussed deeply in this paper.It shows that WWECC is a kind of index that instructs whether the water environment system in watershed can continue to support the development of social economy and ecology,it is dimensionless number.展开更多
基金Supported by the Projects of National Natural Science Foundation （51174196） the Program for New Century Excellent Talents in University （NCET-07-0519）
文摘Aiming to get the strata behavior and stability rules of surrounding rock of the main return airway of Yushujing Coal Mine, convergence deformation of two sides and force of U-shaped steel yieldable support and bolt were monitored, and deformation of surrounding rock and mechanical characteristics of support structure were timely obtained to guide the informa- tion construction and optimize supporting parameters in water-rich soft rock roadway. The field monitoring results indicate the following. （1） Convergence displacement of rock surface increases with time continuity and shows surrounding rock＇s intense theological behavior. The original support scheme cannot control the large deformation and strongly theological behavior; （2） Without backfilling, the U-shaped steel support begins to bear load after erecting for 4-7 days and increases rapidly in the first 30 days. The U-shaped steel support at the right shoulder and top of roadway bears a larger force and the left side and shoulder bears a smaller force; （3） The stress of bolt increasing over time and at the right shoulder of roadway has larger growth and value. The mechanism of rock deformation and the failure and strata behavior in water-rich soft rock roadway are revealed based on the results of the measured relaxation zone of surrounding rock, measured stresses, and the rock mechanics tests.
基金supported by Programfor New Century Excellent Talents in University(No.NCET-06-0130).
文摘Based on the relationship between water environment system and human society,water environment carrying capacity(WECC)probes into supporting ability of complex water environment system to the human society.Recent years,due to the shortage of water resources and serious water pollution in several watersheds in China,the research of watershed water environment carrying capacity(WWECC)becomes very important.The conception,connotation and method of representation of WWECC are discussed deeply in this paper.It shows that WWECC is a kind of index that instructs whether the water environment system in watershed can continue to support the development of social economy and ecology,it is dimensionless number.
