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石化仪表设备安装特点是件多、量大,点散、面广、配管复杂,专业性极强。本研究对设备安装工程前期准备进行了阐述,对安装施工质量控制措施进行了分析,最后强调了开车保运和竣工技术资料档案保存的重要性。 相似文献
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为提高泥浆护壁条件下开挖稳定性的认识,在收集和整理现有研究成果的基础上,分析了泥浆护壁开挖稳定性的影响因素,包括泥浆性质、地基土质条件、开挖槽段的形状以及施工机械和工艺等。同时,根据现场试验和理论研究成果,从土拱效应、时间效应、整体稳定性和局部稳定性等方面分析了泥浆护壁开挖的失稳机理。结果表明,浅层槽壁失稳是泥浆护壁开挖的主要失稳型式,开挖槽段的长度和泥浆液面与地下水位面的高差是控制泥浆护壁开挖稳定性的关键参数。 相似文献
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一维软土地基非达西流固结分析 总被引:1,自引:0,他引:1
水在土体中的渗流规律以及边界的排水情况对土体中孔压消散的快慢有较大影响。采用Hansbo提出的可同时考虑低速渗流曲线段和较高速渗流直线段的非达西流公式模拟土中水的渗透规律,利用Galerkin加权残值方法推导了半透水边界一维非达西流固结问题的有限元方程表达式,并将其编制为应用程序。利用已有的基于达西流的双面半透水边界一维固结解析解答验证了求解方法的合理性和程序编制的正确性。在此基础上对半透水边界一维非达西流的固结特性进行了分析。分析表明, R t =200时,半透水边界相当于完全透水边界,达西流情况孔压消散快于非达西流情况。同一时刻,半透水边界条件下达西流与非达西流固结存在一个深度分界点。分界点以上,非达西流情况孔压消散快于达西流情况;分界点以下,达西流情况孔压消散快于非达西流情况。且分界点随着 m 的增加而变深,但随着 i 1 的增加而变浅。 相似文献
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针对某工程在软土地基上的长江防洪堤边坡架设管廊后的边坡稳定问题,采用抗剪强度折减有限单元法,选取3个典型断面,对比分析了现有边坡以及桩基施工并承载后边坡的稳定性。结果表明,桩基的存在和其所承受的荷载分别对边坡的稳定性具有有利和不利的影响,通过将桩端设置在合适的持力层上,正反两方面的影响基本可以抵消,桩基及管廊施工后对江堤边坡的稳定性影响很小。 相似文献
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One-dimensional consolidation of visco-elastic aquitard due to withdrawal of deep-groundwater 总被引:1,自引:0,他引:1
One-dimensional consolidation of visco-elastic aquitard due to withdrawal of deep-groundwater was studied. Merchant model
was used to simulate visco-elastic characteristic of aquitard. General solutions of the governing equation were obtained by
applying Laplace transform with respect to time, and then the pore-pressure, strain and deformation of the aquitard could
be calculated by Laplace inversion. A case was analyzed to validate the correctness of the present method. Finally, some consolidation
properties of the problem were analyzed. Comparison of the average degree of consolidation defined by pore pressure with that
defined by settlement shows that they are different and the maximum difference is 22.8%. The influences of parameters of Merchant
model and the rate of the water level on the consolidation are great. The smaller the viscosity coefficient is, the later
the rate of consolidation decreases. The rate of consolidation is decreased with the decrease of the rate of the water level
fall. Therefore, the lagged effect of land subsidence should be considered in the actual project. 相似文献
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