滨滩相互层土工程特性初步研究

对滨海相、河滩相互层土(粘性土、粉砂互层)的工程特性提出了系统认识,从理论上、实践上论证了互层土的稠度指标与现场标准贯入击数不协调的根本原因,并推荐了室内液性指数(IL)作必要折减的修正系数,以此按规范求取地基容许承载力,结果与标贯资料基本吻合。显然,修正后的IL不仅解决了测试指标相互间(IL与N)的矛盾,更重要的是客观上提高了地基强度,简化了施工工艺,产生了十分可观的经济社会效益。     

Mean Kinematic Characteristics of Synoptic Easterly Disturbances over the Atlantic

This study investigates the mean kinematic characteristics of the tropical Atlantic easterly disturbances in January-March(JFM),April-June(AMJ),July-September(JAS)and October-December(OND)from 1968-1998.For each season,the preferential tracks of these disturbances in the 3-10-day band periods were computed and spatialized,as well as their associated wavelength,velocity and main period,which lies between 3-5 days and between 6-9 days depending on the track and the season. Two main tracks are highlighted over the Atlantic Ocean.During OND and JFM these two tracks are well separated and located in each hemisphere around 15°S and 12.5°N.From AMJ to JAS these tracks migrate northward;in JAS,they merge into one over the northern tropical Atlantic along 17.5°N.The associated wavelength fields exhibit a meridional gradient,with large wavelengths(greater than 4000 km) around the equator,between 5°N and 5°S,and smaller wavelengths outside of this latitude band(between 2500-3500 km).The phase speed is also found to exhibit poleward decreasing values from 12-6 m s-1. Over the north Atlantic track,6-9-day disturbances were found to occur from January to May and approximately from October to December.From June to September,the 3-5-day waves dominate the synoptic activity.Over the south Atlantic track,between May and August the synoptic variability is mainly explained by the 3-5-day disturbances but from January to April and from September to December both 3-5-day waves and 6-9-day waves can occur.     

神农架林区水文特征

分析了神农架林区的自然地理概况及降水、蒸发、径流、暴雨和水资源等水文特性。     

黄土湿陷变形量计算方法的改进

论述了黄土湿陷变形特性,对工程中惯用的黄土地基湿陷变形量计算方法提出了改进,使其更符合工程实际.     

褥垫层地复合地基受力模式的影响及工程实例分析

采用复合地基方案时，在基础和复合地基之间可设一层粒状材料垫层，以起“调整均化”作用。本文通过分析褥垫层对复合地基受力模式的影响，探讨了褥垫层在保证桩土共同承担荷载，改善复合地基承载性状等方面所具有的重要意义。最后通过对某具体工程实例的分析，得出一些相关结论。     

论碎石垫层在振冲碎石桩复合地基中的必要性

本文通过对复合地基受力性状的分析，结合实际施工经验和处理检测结果，全面论述了碎石垫层在复合地基中的必要性。     

深层搅拌桩处理黄土地基

本文结合有关规范，对在黄土地区应用深层搅拌桩的经验和体会作了阐述。     

湖北省襄荆高速公路与汉十高速公路膨胀土特性的对比研究

膨胀土的膨胀性是襄荆高速公路与汉十高速公路面临的重要工程地质问题，通过X射线衍射分析和颗粒分析试验，发现襄荆高速公路膨胀土体的蒙脱石和伊利石质量分数相对较高，而石英、长石和绿泥石质量分数较低。两条高速公路的膨胀性为弱至中等，但是粘土矿物质量分数的差异导致了襄荆高速公路比汉十高速公路膨胀土体的膨胀性要高；汉十高速公路膨胀土在50kPa压力下饱水后的压缩沉降量基本上大于其膨胀量。     

大型双槽渡槽结构振动特性分析

根据大型双槽渡槽的结构特点，应用薄壁梁段有限元法，考虑了渡槽横向弯扭耦合振动、约束扭转变形和盆式橡胶支座等对渡槽结构动力作用的影响；对实际工程中某大型渡槽进行了振动特性分析，研究了该渡槽设计水位变化对大型渡槽模态的影响，探讨了该大型渡槽在几种工况下的模态变化范围，所得结果可为该大型渡槽的抗震设计提供依据。     

基于小波变换的地震反应分析

从小波变换的基本原理出发，提出了地震地面运动的小波模型，以具有时频特性的小波基来表示，并用于多自由度的地震反应分析，导出了相应的公式，实例表明，这种方法是可行的。