The mechanical properties of marble, limestone, and sandstone as well as the stress-strain curve, the varying characteristics of the peak strength, the peak strain and elastic modulus were studied by using the MTS810 ...The mechanical properties of marble, limestone, and sandstone as well as the stress-strain curve, the varying characteristics of the peak strength, the peak strain and elastic modulus were studied by using the MTS810 Rock Mechanics Servo-controlled Testing System under the action of temperatures ranging from room temperature to 800°C Results show that (1) the peak strength and elastic modulus of marble fluctuate at the temperature from normal to 400°C; and they decrease gradually over 400°C (2) With the rise of the temperature, the peak strength and elastic modulus of limestone show downward trend from normal temperature to 200°C have little change from 200°C to 600°C and decrease sharply over 600°C (3) The peak strength of sandstone shows a downward trend while a little change for elastic modulus at normal temperature to 200°C and from 200°C to 600°C, the peak strength of sandstone increases while a little change for elastic modulus; the peak strength and elastic modulus decrease rapidly at the temperature over 600°C. (4) The peak strain of limestone shows little change at normal temperature to 600°C, however, the peak strain increases rapidly over 600°C; and for marble and sandstone, the peak strain decreases with the rise of the temperature from normal temperature to 200°C, the peak strain increases rapidly over 200°C. The result can provide valuable references for the rock engineering design at high temperature.展开更多
以"雷公藤"为主题词,"药性"、"药性研究"、"机制研究"、"实验研究"等为自由词,在中文数据库如中国期刊全文数据库、维普数据库中检索,以"Tripterygium","Tripterygiu...以"雷公藤"为主题词,"药性"、"药性研究"、"机制研究"、"实验研究"等为自由词,在中文数据库如中国期刊全文数据库、维普数据库中检索,以"Tripterygium","Tripterygium wilfordii","thunder god vine","Leigongteng"为主题词,"traditional Chinese medicine’s property","property","mechanism shudy","experimental study"等为自由词在外文数据库如Medline,EMbase中检索,并跟踪检索相关文献的参考文献,同时参考相关书籍。除去一些重复性研究文献,收集符合相关文献38篇。根据这些文献及相关书籍,首先回顾有关雷公藤药性方面的文献,在此基础上,总结其功效和临床应用,然后对其作用机制的研究进展进行分析。虽然雷公藤及其相关制剂已广泛地应用于治疗各种疾病,但其药性存在争议,作用机制不甚明确,临床应用有欠合理,应该在中药药性理论的指导下,对其作用机制展开研究,以使雷公藤更有效、更合理地应用于临床。展开更多
基金Supported by the National Natural Science Foundation of China (Grant No. 50490273)the National Key Basic Research and Development Program of China (973 Project) (Grant No. 2007CB209400)Xuzhou Institute of Technology (Grant No. XKY2007219)
文摘The mechanical properties of marble, limestone, and sandstone as well as the stress-strain curve, the varying characteristics of the peak strength, the peak strain and elastic modulus were studied by using the MTS810 Rock Mechanics Servo-controlled Testing System under the action of temperatures ranging from room temperature to 800°C Results show that (1) the peak strength and elastic modulus of marble fluctuate at the temperature from normal to 400°C; and they decrease gradually over 400°C (2) With the rise of the temperature, the peak strength and elastic modulus of limestone show downward trend from normal temperature to 200°C have little change from 200°C to 600°C and decrease sharply over 600°C (3) The peak strength of sandstone shows a downward trend while a little change for elastic modulus at normal temperature to 200°C and from 200°C to 600°C, the peak strength of sandstone increases while a little change for elastic modulus; the peak strength and elastic modulus decrease rapidly at the temperature over 600°C. (4) The peak strain of limestone shows little change at normal temperature to 600°C, however, the peak strain increases rapidly over 600°C; and for marble and sandstone, the peak strain decreases with the rise of the temperature from normal temperature to 200°C, the peak strain increases rapidly over 200°C. The result can provide valuable references for the rock engineering design at high temperature.
文摘以"雷公藤"为主题词,"药性"、"药性研究"、"机制研究"、"实验研究"等为自由词,在中文数据库如中国期刊全文数据库、维普数据库中检索,以"Tripterygium","Tripterygium wilfordii","thunder god vine","Leigongteng"为主题词,"traditional Chinese medicine’s property","property","mechanism shudy","experimental study"等为自由词在外文数据库如Medline,EMbase中检索,并跟踪检索相关文献的参考文献,同时参考相关书籍。除去一些重复性研究文献,收集符合相关文献38篇。根据这些文献及相关书籍,首先回顾有关雷公藤药性方面的文献,在此基础上,总结其功效和临床应用,然后对其作用机制的研究进展进行分析。虽然雷公藤及其相关制剂已广泛地应用于治疗各种疾病,但其药性存在争议,作用机制不甚明确,临床应用有欠合理,应该在中药药性理论的指导下,对其作用机制展开研究,以使雷公藤更有效、更合理地应用于临床。
