The eastern capital of the Sui and Tang dynasties was planned and designed in accordance with the features of the mountain and river terrains.Abiding by the basic principles of capital architecture in ancient China,it...The eastern capital of the Sui and Tang dynasties was planned and designed in accordance with the features of the mountain and river terrains.Abiding by the basic principles of capital architecture in ancient China,its shape and layout embodied both the supremacy of imperial power and the requirements of safety and practicality,which led to the formation of its unique architectural characteristics.The main attention was paid to its economic function.For example,the natural rivers were intensively exploited,which made Luoyang into an economic center radiating in all directions by means of dense river nets.As such a group of distinctive and brilliant building complexes,the eastern capital of the Sui and Tang dynasties held an important position in the architectural history of ancient China and exerted deep-going and far reaching influence upon the capital architecture of East Asian countries in later times.展开更多
The techniques of stress relief mining in low-permeability coal seams and pillarless gob side retained roadway entry using Y-type ventilation and gas drainage systems were developed to control gas outbursts and applie...The techniques of stress relief mining in low-permeability coal seams and pillarless gob side retained roadway entry using Y-type ventilation and gas drainage systems were developed to control gas outbursts and applied successfully. However, as the mining depth increasing, parts of the gas drainage system are not suitable for mines with high gas emissions. Because larger mining depths cause higher ground stresses, it becomes extremely difficult to maintain long gob side roadways. The greater deformation suffered by the roadway is not favorable lor borehole drilling for continuous gas drainage. To solve these problems, Y-type ventilation and gas drainage systems installed from a roof roadway were designed for drainage optimization. This system was designed based on a gas-enrichment zone analysis developed from mining the 11-2 coal seam in the Zhuji Mine at Huainan, Anhui Province, China. The method of Y-type gas extraction from different mine areas was applied to the panel 1112（1） in the Zhuji Mine. The absolute gas emission rate was up to 116.3 m^3/min with an average flow of 69.1 m^3/min at an average drainage concentration of nearly 85 %. After the Y-type method was adopted, the concentration of gas in the return air was 0.15 %-0.64 %, averaging 0.39 % with a ventilation rate of 2100-2750 m^3/min. The gas management system proved to be efficient, and the effective gas control allowed safe production to continue .展开更多
文摘The eastern capital of the Sui and Tang dynasties was planned and designed in accordance with the features of the mountain and river terrains.Abiding by the basic principles of capital architecture in ancient China,its shape and layout embodied both the supremacy of imperial power and the requirements of safety and practicality,which led to the formation of its unique architectural characteristics.The main attention was paid to its economic function.For example,the natural rivers were intensively exploited,which made Luoyang into an economic center radiating in all directions by means of dense river nets.As such a group of distinctive and brilliant building complexes,the eastern capital of the Sui and Tang dynasties held an important position in the architectural history of ancient China and exerted deep-going and far reaching influence upon the capital architecture of East Asian countries in later times.
基金Acknowledgments This work was supported by the National Nat- ural Science Foundation of China （41172147）, the Anhui Province Science and Technology Research Plan （12010402110）, and the Shanxi Province One Hundred Distinguished Professor Plan project.
文摘The techniques of stress relief mining in low-permeability coal seams and pillarless gob side retained roadway entry using Y-type ventilation and gas drainage systems were developed to control gas outbursts and applied successfully. However, as the mining depth increasing, parts of the gas drainage system are not suitable for mines with high gas emissions. Because larger mining depths cause higher ground stresses, it becomes extremely difficult to maintain long gob side roadways. The greater deformation suffered by the roadway is not favorable lor borehole drilling for continuous gas drainage. To solve these problems, Y-type ventilation and gas drainage systems installed from a roof roadway were designed for drainage optimization. This system was designed based on a gas-enrichment zone analysis developed from mining the 11-2 coal seam in the Zhuji Mine at Huainan, Anhui Province, China. The method of Y-type gas extraction from different mine areas was applied to the panel 1112（1） in the Zhuji Mine. The absolute gas emission rate was up to 116.3 m^3/min with an average flow of 69.1 m^3/min at an average drainage concentration of nearly 85 %. After the Y-type method was adopted, the concentration of gas in the return air was 0.15 %-0.64 %, averaging 0.39 % with a ventilation rate of 2100-2750 m^3/min. The gas management system proved to be efficient, and the effective gas control allowed safe production to continue .
