杭州萧山国际机场二期国内航站楼地毯选型及施工要点研究分析

本文以杭州萧山国际机场二期国内航站楼项目地毯工程为例,通过对国内机场地毯进行评估优选,根据结果采用阿克明斯特机器编织的7x12针混纺满铺地毯进行施工,圆满完成了本工程的地面铺设。希望能够给类似工程项目提供一些参考。     

浦东国际机场二期候机长廊稳定性研究

研究了复杂空间结构体系的整体稳定性能.利用ANSYS程序的非线性分析功能对上海浦东机场二期工程中的候机长廊结构进行了多种荷载组合下的稳定性分析,得到各组合下的屈曲荷载因子、屈曲特征、屈曲模态及不同因素的影响.对这些结果的比较可知,结构的整体稳定分析是必要的,结构的初始缺陷、几何非线性、材料非线性对结构整体稳定的影响很大,分析时不宜忽略.     

上海浦东国际机场二期航站楼登机长廊清水混凝土施工

1工程概况清水混凝土建筑作为一种建筑表现形式,最早出现于上世纪60年代,曾在建筑界引起轰动,以后逐渐使用于德国、美国等欧美国家。国内清水混凝土施工已有较多的尝试,如沪青平立交(获得国家级市政奖)等。清水混凝土要达到装饰效果,对模板配置、混凝土原材料、浇捣工艺、表面修饰保护等有较高要求。目前,清水混凝土存在模板质地软、平整度差、表面粗糙;模板拼缝不严、易漏浆;混凝土浇捣工艺不佳,造成砂带色差;保护材料耐久性有限,表面变黄变黑等不足。上海浦东国际机场二期航站区工程建设总目标是建设一个枢纽型航空港,是上海市的重点工程,…     

Numerical Assessment for the Behavior of the Pleistocene Marine Foundations due to Construction of the 1st Phase Island of Kansai International Airport

A series of elasto-viscoplastic finite element analyses is performed to assess the stress and deformation of the Pleistocene marine foundation due to construction of the 1st phase island of Kansai International Airport in Osaka Bay. Attention is paid to the modeling of permeability for Pleistocene sand gravel layers considering the sedimentation environment because the performance of excess pore water pressure is strongly dependent on the extent of distribution as well as the change of thickness of those permeable sand gravel layers. The concept of “mass permeability” is introduced to model the actual process of dissipation of excess pore water pressure in the field. The mechanism for the propagation of excess pore water pressure is also discussed. Special attention is given to the modeling of the compressibility of the highly structured Pleistocene clay layers, exhibiting already significant visco-plastic deformations even in the quasi-overconsolidated effective stress range. The present numerical analyses are found to describe the large and long-term settlement together with the slow dissipation of excess pore water pressure in the Pleistocene clay and sand gravel layers that actually has taken place in the field. A detailed comparison of the distribution of excess pore water pressure and the differential compression for the individual Pleistocene clay layers shows that the calculated performance can well describe the actual behavior of the Pleistocene deposits due to the construction of the 1st phase island of Kansai International Airport.     

承德机场沉降变形时间序列分析与预测研究

基于新建承德机场沉降量的实测资料,针对西端高边坡的地基沉降问题,采用指数曲线函数模型和双曲线函数模型以及皮尔曲线模型进行了最终沉降量预测。对比分析了不同数学模型的拟合精度,通过对不同模型拟合效果的比较,选取双曲线模型对承德机场工后最终沉降量进行预测,得出新建承德机场西端高边坡测点1-4的最终沉降量为58.24mm。最终沉降量的预测结果对机场后续监测和建设具有指导意义,对机场后续工程起到优化施工和安全预报的作用。     

考虑工后沉降影响的降水设计实例

疏排法基坑降水作业后,地下水位的降低将使原水位面以下土体的自重应力增加,造成相应的地表或深层土体沉降,对周边建筑物、浅埋的地下管线及行车路面会构成不同程度的危害。因此,在基坑降水设计阶段,对工后沉降危害的评估是非常必要的,同时,可提出相应的措施以控制工后沉降。     

A Slope Stability Analysis Considering Undrained Strength Anisotropy of Natural Clay Deposits

The effects of sites and plasticity index (I_p) on the inherent strength anisotropy of eleven different clay deposits are quantitatively examined by the unconfined compression test using a small size specimen with a different angle of inclination to the vertical. A new method for a slope stability analysis, taking the effects of the IASIA method (Inherent And Stress Induced Anisotropies) into consideration, is proposed. The applicability of the IASIA method and the optimum embankment design are examined through case histories of embankment failures on soft soils. The undrained strength anisotropy cannot be estimated by parameters such as the I_p value because of the complicated relationship with the factors influencing undrained anisotropic strength. It must be directly measured. The IASIA method was recommended from a study of a failed embankment. The probability of failure (P_f) and consumer's risk (P_c) from half of the unconfined compressive strength (q_u/2) were (2.5~25.5)% and (4.7~42.3)% less than those of the Iwai q_u/2_(IASIA) and Urayasu q_u/2_(IASIA). Therefore, the design results were underestimated by disregarding strength anisotropies. If, P_f and P_c were considered, the C_t values increased. However, the P_c values drastically decreased to 24.8% from 54.3% concerning the 75-mm sampler and n increased, thus avoiding latent risks. These mean that the IASIA method can be used for optimum embankment design based on performance provisions.     

上海浦东国际机场二期航站楼桩基施工技术

结合上海浦东国际机场二期航站楼连廊和主楼桩基工程,介绍了在PHC管桩与预制方桩有序组合的大型桩基工程中施工的整个过程,以及所采用的关键施工技术措施。     

Proposal of a Simple Method for Assessing the Susceptibility of Naturally Deposited Clay Grounds to Large Long-Term Settlement due to Embankment Loading

A simple method that utilizes the results of laboratory tests has been proposed for determining the susceptibility of soft clay grounds to large residual consolidation settlement due to embankment loading. It was found that there is a possibility of large long-term settlement if the sensitivity and compression index ratios of the clay material that constitutes the ground are equal to or more than 8.0 and 1.5, respectively. The compression index ratio is defined in this paper as the ratio (Cc/Ccr) of the steepest gradient of the compression curve of an undisturbed sample to that of the remolded sample. Through the SYS Cam-clay model, an elasto-plastic constitutive model that describes the actions of the soil skeleton structure, it was found that clays with large sensitivity and compression index ratios are characterized by initially highly structured soils and that decay/upgradation of the structure can easily occur due to plastic deformation. In addition, by following Schmertmann's graphic method for in-situ compression curve (1953), this paper proposes a method of deducing the in-situ initial conditions from the results of laboratory consolidation tests on undisturbed samples. These investigations revealed not only that large delayed settlement is facilitated in clays, which have higher degrees of structure and faster rates of structural decay, but also that the Δe method and other simple methods of predicting settlement may underestimate the amount of settlement.     

青岛流亭机场国际航站楼基坑支护设计与施工

青岛流亭机场国际航站楼厦地下车库深基坑工程,根据周边环境度场地地质条件。本着安全、经济的原则,采用自然放坡、钢筋混凝土桩＋锚杆、重力式挡墙不同的支护形式,介绍了其施工工艺取得了施工安全、缩短工期、节省投资的效果。     

考虑软粘土流变特性的高速公路路基沉降变形分析

本文对高速公路路基软粘土的变形规律进行了详细分析,在此基础上,结合高速公路工程实例,对影响路基稳定的沉降、侧向位移、工后沉降及土体稳定进行了分析,并对实测的资料进行分析比较,从而阐述了软粘土地基进行变形分析时考虑土体流变性的必要性。     

上海浦东国际机场外侧促淤工程地基的沉降控制

滩涂圈围造地工程通常包括：促淤、围堤和吹填3部分。促淤施工处于第1阶段,其先期的沉降计算和分析,除能有效指导施工、确保工程安全和按期竣工外,对今后修建御海大堤和圈围内滩地吹填设计工况的沉降控制,具有重要的指导作用。沉降在控制对象上可分为最终沉降量控制和不均匀沉降控制;从时间阶段上又可分为施工期的沉降控制与工后沉降控制。     

浦东国际机场航站区施工方格网布设

根据浦东国际机场航站区施工方格网布设的实例 ,讨论施工方格网布设的精度及其布设方案 ,分析利用 GPS技术与常规仪器相结合建立施工方格网的可行性和可靠性 ,并给出了几点经验。     

浦东国际机场二期登机长廊钢结构安装施工

上海浦东国际机场二期登机长廊钢结构安装过程中,因地制宜地选用了吊装方法和施工工艺,发挥自身优势,改造现有设备,并通过合理计算,利用原设计的构件代替临时支撑,既加快施工进度,又减少了人力、物力。     

建设工程结算二次审核问题的探讨

通过分析建设工程结算二次审核必要性、问题及难点,提出提高二次审核工作效率的方法。     

青岛流亭机场国际航站楼工程综合施工技术

以青岛流亭机场国际航站楼工程为依托,对复杂地质条件下的基坑支护、整体的施工部署、预应力与后浇带技术、钢结构屋盖和塔台施工、超宽风管等多项新技术进行研究,综合采用了止水帷幕与边坡防护、预应力后浇带、钢结构顶推滑移、悬挑支撑与倒模工艺、超宽大截面薄钢板风管等技术并进行了优化与创新,取得了环保节能、节约平面与空间、满足设计要求、保证工程在奥帆赛前正常投入使用等效果,对类似工程具有指导意义.     

上海浦东国际机场二期工程施工现场平面布置浅析

介绍了上海浦东国际机场二期工程施工现场平面布置的施工现场区域特点,现场平面布置原则,施工临时建筑、通道、供电供水系统等实施方案,总结了大型工程建设前期筹划管理的经验。     

浦东机场二期扩建工程造价管理

本文从造价控制机制、措施、手段等几方面系统的阐述了浦东机场二期扩建工程的造价管理,详细地分析了造价管理制度、概算比对、合同管理、工程变更管理、续标项目的管理等在造价管理中对控制目标的影响,并探讨了项目组织、投资监理对造价控制目标的组织保障和技术保证.     

Prediction of Settlement in Natural Deposited Clay Ground with Risk of Large Residual Settlement Due to Embankment Loading

This study endeavors to predict the settlement that could occur in the future at a site where settlement due to embankment loading is already occurring at present. In the site studied here, large residual settlement of as much as 70 cm has already occurred in the 4 years since it entered into service. It is believed that settlement will also continue in the future because excess pore pressure is still present within the clay layers. Furthermore, according to the method of evaluation proposed previously by the authors, which is based on the sensitivity and compression index ratios, it can be judged that the ground includes clays that are sensitive to disturbance and have a strong possibility of large residual settlement. In this paper, simulation of the settlement observed up to now at the site as well as prediction of the settlement that could occur in the future was carried out by deducing the higher compressibilities possessed by the in-situ clays compared with the undisturbed clay specimens in the laboratory. The soil-water coupled finite deformation analysis was employed using the analysis program GEOASIA, in which the constitutive equation for the soil skeleton is mounted with the SYS Cam-clay model. In addition, the effect of modifying the vertical section of the embankment by overlaying in order to counter the settlement was also investigated by numerical analysis. The results showed that such a countermeasure cannot be expected to lead to faster consolidation and that it may require massive funding over a long period of time to cover the maintenance and management costs involved.     

大型国际机场工程进度绩效的影响因素分析——基于北京大兴国际机场的案例

进度绩效是工程项目重要的控制要素之一.大型机场工程具有工程规模巨大、工程建设程序复杂等特点,导致其建设与管理统筹管理难度比一般项目更大.以北京大兴国际机场建设指挥部与运营管理中心的22个部门为研究对象,基于组织行为学理论,考察部门工作项数、风险等级和进度跟踪问题数量对工程进度绩效的影响,探究进度跟踪问题数量的调节作用,...