摘  要：利用物理改性和化学改性对氟石膏进行处理，考察了物理改性和化学改性对氟石膏性能的影响，并运用XRD、SEM等手段测试了改性后氟石膏的物相组成和微观形貌，探讨了物理改性和化学改性的作用机理。结果表明，物理改性和化学改性有效激发了氟石膏的活性；物理改性降低了无水硫酸钙晶体的晶粒度和结构规则性，增大了氟石膏的比表面积，氟石膏最佳比表面积为4600～4900cm2/g；化学改性促进了氟石膏的水化和二水硫酸钙晶体的生长，增大了二水硫酸钙晶体的晶粒度和长径比，有效激发了氟石膏的强度。Abstract:Bymodifyingfluorgypsumusingphysicalandchemicalmethods,theeffectsofphysicalmodificationandchemicalmodificationontheperformanceoffluorgypsumwerestudied.ThephasecompositionandmicrostructureofmodifiedfluorgypsumwerecharacteredbyXRDandSEM,andthemechanismsofthetwomodificationmethodswerediscussed.Theresultsshowthatfluorgypsumactivityisexcitedeffectivelyusingphysicalmodificationandchemicalmodification.PhysicalmodificationcanreducethegrainsizesandstructureregularityofCaSO4,increasethespecificsurfaceareaoffluorgypsum,andtheoptimumrangeofspecificsurfaceareais4600～4900cm2/g.ChemicalmodificationcanacceleratefluorgypsumhydrationandCaSO4·2H2Ogrowth,andincreasethegrainsizesandaspectratiosofCaSO4·2H2O,meanwhile,itcanalsoenhanceeffectivelythestrengthoffluorgypsum.

摘  要：利用铁尾矿砂替代天然砂制备尾矿砂水泥基复合材料，研究了铁尾矿砂替代比率对复合材料工作性和抗压强度的影响。试验结果表明，随着铁尾矿砂掺量的增加尾矿砂水泥基复合材料的坍落度减小，尾矿砂的替代比例在40%～60%范围内可获得较高的抗压强度。Abstract:Usingirontailingsandreplacingthenaturalsandtopreparethetailingsandcementitiouscomposite,theinfluencesofthedifferentratiosofirontailingsandontheworkabilityandcompressivestrengthofthecementitiouscompositearestudied.Testresultsshowthatwhenthedosageoftheirontailingsandincreases,theslumpofthecementitiouscompositereduces.Thecompressivestrengthofthecementitiouscompositeishigherwhenthetailsandreplacementratioisintherangeof40%～60%.

摘 要：介绍了某软土区深基坑全逆作法施工中总体设计方案的选取、地下连续墙、土方开挖等施工工艺。施工中通过采用全逆作法的施工方案，在场地狭小、对周围相邻建筑保护和管线保护要求较高的情况下，大大缩短了工期，满足工程进度要求，较好地达到了预期目标。 Abstract: The construction technologies with reverse method of deep foundation pit in some soft soil area are introduced, such as the overall design plan selection, underground diaphragm wall, earth excavation, etc.. Through the construction scheme of total reverse method, it can achieve a better target in small venues and higher requirements of the adjacent building protection and pipeline protection conditions, which can shorten working time and meet the requirements of project progress.

摘 要：以常州市第一个地铁车站基坑换撑的监测、施工过程为背景，对地铁车站信息化施工过程进行了分析。实践表明，监测信息可以有效指导换撑过程的实施，依据监测信息制定拆撑方案，可简化施工过程，减少工作量，对工程项目而言既可降低建设成本又可缩短建设工期。 Abstract: The information-based construction is analyzed about the changing-support work of the first subway station pit in Changzhou. ?It is shown that monitoring information may observe and direct the support change work effectively. The new plan according to the monitoring information can simplify the construction process and decrease the work capacity. Therefore, in this project, the cost is reduced, and the construction period is shortened.

摘 要：将加载方式分为单轴拉伸荷载和压荷载两种，通过碟簧及应力传感器进行恒载控制，开发出了在应力状态下测试混凝土电通量和扩散系数的装置。将加载一定应力的混凝土试件采用“NEL法”和“电通量法”进行在线渗透性测试，实现了持续荷载下混凝土渗透性的测试。 Abstract: Dividing the loading methods into uniaxial tensile loads and pressure loads, through controlling the dead loads by a disc spring and a stress sensor, a kind of the loading device to test the electric flux and diffusion coefficient of concrete under the stress state has been developed. The online permeability of concrete specimens loaded with a certain stress is tested by "NEL methods" and "chloride electric flux methods", which has realized to rapidly test the permeability of concrete under sustained loads.

摘 要：针对转换梁上剪力墙不同的洞口大小，采用MIDAS软件对4个框支剪力墙结构模型在相同的竖向荷载作用下进行了有限元分析。研究了墙梁共同作用对转换梁截面水平应力、轴力与弯矩分布规律的影响，为转换梁在实际工程中的应用提供了一定的设计依据和建议。 Abstract: According to different hole sizes of shearing wall of the transfer-beam, four structure models of shearing wall supported by frames under same vertical loads are analyzed by finite element method with the software MIDAS. The influences of wall-beam interaction on the distribution of horizontal stress, axial force and moment of transfer-beams are studied, which can provide some design bases and suggestions for the application of transfer-beams in the practical project.