基于贝叶斯信念网络的多案例库检索方法

为了克服在基于案例推理中单一案例库检索的局限性,提出了基于贝叶斯信念网络的多案例库检索方法.该方法仅要求用户采用关键词对目标案例进行描述,通过贝叶斯信念网络计算关键词与各案例库的特征属性的匹配概率,以获得适应各案例库的完整的目标案例描述,然后对相应的案例库进行案例检索;将从多案例库中检索到的案例通过相似度线性归一处理后,结合目标案例描述的匹配概率获得与目标案例的最终相似度,统一排序后返回检索结果.最后通过航空企业的实际应用与性能分析进一步验证了多案例库检索方法的有效性.     

SBC120防水卷材在厨卫间防水工程中的应用技术

西安某住宅楼为6层砖混结构．建筑面积7800m^2。该工程厨房、卫生间防水层原设计为涂料类防水材料．后改为卷材类防水材料,经论证,采用SBC120聚乙烯丙纶防水卷材铺贴,聚氨酯防水涂膜收口、封边、涂刷管根等部位（处理宽度10cm,刮涂两遍）。该工程入住一年未发现一处渗漏水,效果较好,解决了厨卫防水的问题。     

《混凝土结构工程施工规范》GB50666—2011编制简介——环境保护

介绍了《混凝土结构工程施工规范》GB50666—2011中环境保护的编制背景和主要内容,包括施工环境保护计划,建筑垃圾处理的一般原则,防尘、降尘、控制扬尘,降噪,控制光污染,控制水污染,现场拌制混凝土时的环保措施,使用脱模剂时的环保措施,漏油的无害化处理,混凝土外加剂、养护剂的使用,对挥发性有害物质的防护,建筑垃圾的分类处理,并探讨了实施中应注意的几个问题。     

基于BIM的智能化模架在幸福林带项目混凝土双曲屋面中的应用

众多工程实践表明,要达成曲面混凝土建筑安全、高品质、低成本的目标,应用BIM技术对施工方案进行优化具有明显的成效.针对混凝土曲面建筑模板工程施工工艺,采用BIM技术辅助设计和施工,进行结构曲面找型、三维模型结构定位、划分分隔网、优化设计方案,并且精确每根支撑杆件定位和高程.根据双曲面构件详图、BIM三维坐标定位图,科学...     

混凝土早龄期强度的试验分析

在混凝土结构施工中,混凝土早期强度是混凝土结构施工安全的控制因素。鉴于现行混凝土验收标准和当前研究的不足,文中通过试验对早龄期混凝土强度进行分析,希望能加深对混凝土早龄期强度及其发展规律的认识,从而在施工过程中加强对混凝土的控制,以达到结构安全、高效施工的目的。     

《建筑业10项新技术》(2010版)之绿色施工技术

《建筑业10项新技术》(2010版)之绿色施工技术包括基坑施工封闭降水技术、施工过程水回收利用技术、预拌砂浆技术、外墙自保温体系和工业废渣及(空心)砌块应用技术、粘贴式外墙外保温隔热系统施工技术和外墙外保温岩棉(矿棉)施工技术、现浇混凝土外墙外保温施工技术、硬泡聚氨酯外墙喷涂保温施工技术、铝合金窗断桥技术、太阳能与建筑一体化应用技术、供热计量技术、建筑外遮阳技术、植生混凝土技术、透水混凝土技术。重点介绍了各技术的应用形式以及要点,实现建筑领域资源节约与节能减排。     

Numerical parametric study on stability and deformation of tunnel face reinforced with face bolts

Although face bolting has been used as a stabilisation technique in open-face tunnelling for decades, there is still a lack of systematic ways for determining the optimum parameters of face bolts. To optimise design for face bolting in soft ground, it is necessary to understand the influences of each parameter associated with face bolting on ground response. In this note, five series of numerical parametric studies are carried out, to investigate the effects of length, density, reinforcement area, axial rigidity of face bolts and strength of soil on tunnel face stability and deformation in soft rock. Based on the ground condition, geometries of tunnel and configurations of face bolts simulated, the optimum length, density and axial rigidity of face bolts are found to be 0.6H (H = height of tunnel), 1 bolt/m² and 195 MN, respectively. The optimum axial rigidity of face bolt appears to be independent of the bolt density. The computed results also reveal that it is more effective to reduce face deformation by installing face bolts around the tunnel periphery, than installing them near the central area of the tunnel face.     

Analysis on contaminants transport process through clay-solidified grouting curtain in MSW landfills

Clay-solidified grouting curtains are commonly used for remediation by containment or pollution prevention, in addition to their use as a barrier to water flow in municipal solid waste(MSW) landfills. A hydrological model of water flow and a hydrodynamic model of contaminant are presented to simulate the migration of leachate through clay-solidified grouting curtain in MSW landfills, with particular attention paid to the role of diffusive and adsorptive fluxes in contaminant transport. The models were applied to simulate the sensitivity of the curtain’s behavior to changes in parameters, such as thickness, depth, permeability coefficient, diffusion coefficient, resistance coefficient and concentration, and also to demonstrate the contaminant distribution on the evolution of travel time and offset distance of clay-solidified grouting curtain in landfills. It is found that a part of leachate components stays or is retarded in clay-solidified grouting curtain by precipitate or exchange, the retention rate is closely related to composition of clay-solidified grouting curtain, more than 80%, and the maximum occurs at the cementclay ratio of 2 : 4 under experimental conditions. Contamination distribution is variable on travel time and offset distance, the highest concentration takes place where the contamination intensity is nearest to the pollution resource or takes place at early middle period of transport, and the pollutant attenuates gradually. The results indicate that claysolidified grouting curtain with a proper thickness, a low permeability coefficient and a high resistance coefficient might serve as a sufficiently effective vertical barrier against leachate seepage and contamination migration in MSW landfills. Foundation item: Project(2000-65) supported by the Foundation for University Key Teacher by the Ministry of Education of China     

建设工程管理师执业资格设置研究

我国在建设工程管理领域建立了监理工程师、造价工程师、咨询工程师(投资)和建造师等执业资格制度,促进了建设行业管理人员素质的提高。在对当前建设工程管理领域执业资格的实践深入分析后,认为存在执业资格设置不科学、执业资格管理模式不统一、不利于人才流动和社会资源浪费等问题。在借鉴PMP认证体系的基础上,提出了将上述4个执业资格合并为建设工程管理师执业资格的构想,并从各执业资格的工作阶段、工作内容和所需要的知识体系以及当前的建设管理体制等角度论证了可行性。建设工程管理师执业资格的设置可以有效地克服上述问题。     

几何非线性大转动变形分析

以几何非线性余能原理为基础,通过对一悬臂曲梁自由端部受弯矩作用而产生大转动变形的数值算例分析,验证了该原理适用于解决具有曲线边界的几何非线性问题。