湿陷性黄土对铁路路基的影响及工程措施

结合包西线的概况，介绍了湿陷性黄土的特性，分析了湿陷性黄土对包西铁路西延段路基的影响，阐述了湿陷性黄土的处理措施，以使铁路安全运行。     

水文工程中推行工程量清单计价

比较了工程量清单与定额计价的区别,从工程量清单招投标、合同管理等方面论证了工程量清单计价应用在水文工程投资上的优越性,表明了工程量清单计价与市场相适应,适宜于水文工程计价及工程管理。     

一类二阶泛函微分方程 x″(t)+f(t,x(g(t)))·Φ(x′(h(t)))=0的振动性

关于方程 x″(t)+f(t,x(g(t))·Φ(x′(h(t)))=0的振动性给出若干判别定理,判别准则均采用了形如 integral from n=1 to ∞ (f(t,c)dt),integral from n=1 to ∞ (tf(t,c)dt)的积分的敛散性.James.S.W.Wong 分别研究了方程 x″(t)+f(t,x(t))=0,x″(t)+a(t)f(x)g(x′)=0.笔者只要求Φ(y)>0,在其它条件相当情况下.推广了文[1]中相应结果.同时也推广了文[2]中定理1.而条件Φ(y)>0比文[2]中所给出的条件0相似文献   

水泥土搅拌桩在某高速公路软弱地基中的应用

结合工程实践，介绍了水泥土搅拌桩加固软弱地基的原理、适用条件、设计计算与施工方法要点，对于利用水泥土搅拌桩加固桥涵基础及软弱路堤有一定的借鉴作用。     

刚性防水板在国家大剧院壳体屋面上的应用

国家大剧院工程屋面防水原设计方案是柔性防水,材料为进口的EPDM,实际采用刚性防水板,根据结构形式经向分成五层,纬向分成若干段,均为下大上小的扇形,采用锁边机锁边,施工相对简单,施工速度快,漏水的风险很小。综合比较,刚性防水施工工期比柔性防水施工工期缩短了近两个月,刚性防水造价比柔性防水造价减少了约4000万元,为业主节约了大量的资金。     

膜结构设计与施工

对两个索膜工程的设计与施工过程进行了论述,并对两工程在施工过程及预应力的施加方法上的差别进行了横向比较:对于帐篷膜结构而言,设计对结构最终成功与否所起的作用更大,在该结构的设计中膜与柱相连节点的顶圈与环销相分离的做法是创新之处;对于活动铰支座形式的膜结构,施工所起的作用更大,施工方法是否正确、预应力施加与调整,对结构的最终成型有至关重要的影响。     

火力发电产生的高钙粉煤灰的改性研究

本文以电厂发电采用的循环流化床燃烧煤产生的高钙粉煤灰作为研究的对象,主要是为了找到高钙灰降钙的方法,在此基础上改善高钙灰的性能,然后把这种高钙灰利用到水泥生产或混凝土中,变废为宝,变害为利,合理综合利用。     

PYROLYSIS AND GASIFICATION OF SEWAGE SLUDGE IN A SPOUTED-BED REACTOR

The use of sewage sludge as the fuel for fluidised-bed gasifiers, which form part of combined heat and power systems, has been studied in an EU funded project. A laboratory-scale spouted-bed reactor was used to investigate the pyrolysis and gasification behaviour of a suite of sewage sludges in the temperature range 770–980°C and pressures between 0.2 and 0.4 MPa. High solids conversions were measured, on a dry ash-free basis, which were consistent with the high volatile-matter content of the sludge-based fuels. It seems that most of the fuel was pyrolysed and converted to gas and condensable tars/oils. The proportion of hydrogen which was formed increased with the gasifier temperature and with the char bed height in the reactor, and this was consistent with an increase in the extent of cracking of the tars/oils. The nitrogen content of the sewage sludge was high, and this led to high ammonia concentrations in the fuel gas. Operating at the higher end of the temperature range tended to decrease the amount of ammonia in the fuel gas.     

大管径直埋预热管道穿越道路设计方案

针对管径大于1000mm的高温热水管道穿越市区不允许开挖道路的情况，考虑3种管道设计方案，分别进行了分析，比较结果表明，采用球型补偿器的方案切实可行，不仅可以减少固定支架的数量，而且可以降低施工难度。     

Contact flocculation-filtration of humic substances

Contact flocculation-filtration of humic dispersions with alum in medium grain (0.62 mm) sand gave short runs to breakthrough, while in coarse (1.2 mm) media clarification was inefficient. Alum with cationic polymer gave in coarse media acceptable runs, but shorter then for mineral dispersions. Analysis of results by parameters of existing filtration models showed that using the Ives-Iwasaki model and plotting filtration coefficient λ vs specific deposit σ gave different λ_max for different polymer dose, plot of λ_max vs dose goes through maximum at optimum dose.Plotting the cube root of headloss vs square root of specific deposit gave a straight line corresponding to Shektman formula.Analysis by Adin-Rebhun model showed that for contact flocculation-filtration humic dispersions attachment coefficient k₁ was similar to, detachment k₂ was many fold higher then and theoretical maximum mass capacity much lower then in case of mineral dispersions.Calculations showed that the solid content and the density of alumo-organic deposits in bed are much lower than of alumo-mineral deposits. Polymers and minerals increase the solid content, the density of deposits and the mass capacity of filter beds.