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职称英语理工完形填空历年试题模拟试题补全短文概括大意词汇指导阅读理解例题习题卫生职称英语词汇指导完形填空概括大意历年试题阅读理解补全短文模拟试题例题习题综合职称英语完形填空历年试题模拟试题例题习题词汇指导阅读理解补全短文概括大意
论文作者:英语论文网论文属性:作业 Assignment登出时间:2014-06-04编辑:hynh1021点击率:16948
论文字数:4158论文编号:org201406032059129464语种:英语 English地区:中国价格:免费论文
摘要:The rapid development of underground construction, so that more and more people in different ways of living in the underground environment, and therefore meet the basic requirements based on the use of underground construction continuously higher quality requirements. From medicine, physiology, psychology and other disciplines, different perspectives, many ways to improve the underground environment of the ways and measures, including some of the more complex issue.
As the underground construction of the building structure is different from the specificity of the upper part, involving the design, construction technology, environment and soil mechanics, such as technical progress in a series of problems in engineering applications engineers often encounter the following problems:
(1) of the underground structures of conventional reinforced concrete structures are mainly ordinary reinforced concrete structural system used in the existence of large-scale underground structure of the high cost, even cross-section structure, and the impact of depth of underground structures, construction progressing at a slow pace, as well as the shortcomings of a waste of construction materials, should the new system, the introduction of construction materials and structural design of underground structures to meet the modern requirements of the development of underground space, with limited resources for better results.
(2) as the cause of urban rail transit development, urban towel existing and new buildings and subway lines crisscrossing the upper part of structure is at the top of the subway tunnel, the conventional reinforced concrete structure of care for the larger cross-section of the underground architectural space also have a greater impact. Workers should be the actual situation in innovative technology, choose a reasonable form of structural transformation of the construction and related measures to ensure that the subway project and the safety of the upper structure and to minimize the impact of the underground&n本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。