排序方式: 共有454条查询结果,搜索用时 718 毫秒
331.
以地铁为中心的综合一体化换乘中心日渐普遍,地铁站换乘空间导向性是影响换乘高效程度的重要因素。Depthmap作为空间句法分析软件,对空间具有独特的分析视角。首先,介绍空间句法相关知识及北京地铁白石桥南站的运行现状;其次,利用空间句法软件depthmap建立模型,对平面中的流线组织、平面布局与节点设计采用空间句法参数分析,将难以用语言进行描述分析的地铁站换乘空间用空间句法的不同参数进行表达与评价;最后,以白石桥南站为例,基于空间句法软件depthmap分析结果,针对发现的问题提出相邻空间的有机整体连接、采用大尺度融通空间、重要节点设计吸引人流等优化设计策略。 相似文献
332.
333.
334.
335.
336.
337.
338.
339.
The problem of filter-cake formation in highly permeable strata is urgently to be solved for slurry shield tunnelling. Adding coarse-particle materials in slurry is an effective method to solve the problem. A selfdesigned test device of slurry invasion and filter-cake formation in strata was adopted, and one kind of lightweight sand was selected as coarse particle materials. By changing the particle sizes of light-weight sand particles, the filtrate mass and the time of filter-cake formation under the condition of different additive contents and pressures were measured. And the influence of particle size of coarse-particle materials on filter-cake formation characteristics was analyzed. A triangular constriction calculation method was proposed, which can be used to quickly determine the influence range of coarse-particle materials on the pore size variation of the strata. The test results show that: (1) the addition of coarse-particle materials can significantly reduce the inter-particle pore size and effectively improve the clogging effectiveness under the condition of this tested strata. (2) The particle size of coarse-particle materials has a great influence on filter-cake formation characteristics. The coarse-particle material with smaller particle size has a better clogging effect, and its filter-cake formation characteristics are more stable. The coarse-particle material with larger particle size has a higher volatility in its filter-cake formation characteristics. (3) Coarse-particle materials with different particle sizes result in different final filter-cake structures. When the coarse-particle materials possess a larger particle size, a mixed filtercake structure is formed, and when the particle size is small, a double-layer filter-cake structure is formed. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved. 相似文献
340.